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398 - Optical communications


398025000 - Determination of communication parameter

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20110200328SCHEDULING DEVICE - A control device (08-18-2011
20100150552OPTICAL/ELECTRICAL COMPOSITE CABLE, OPTICAL/ELECTRICAL COMPOSITE CABLE CONNECTION DEVICE AND OPTICAL/ELECTRICAL COMPOSITE CABLE DRIVE METHOD - An optical/electrical composite cable in which a first connector having an optical transmission unit is connected to a second connector having an optical reception unit via an electrical wire and an optical wiring line includes a state detection unit that detects a connection state of the first connector, a connection state of the second connector, a power supply state of a transmission-side electronic device connected to the first connector and a power supply state of a reception-side electronic device connected to the second connector, and an electrical power supply control unit that controls supply of electrical power to the optical transmission unit and optical reception unit according to the detected states.06-17-2010
20090123150METHOD AND SYSTEM FOR POWER CONTROL OF FIBRE CHANNEL SWITCHES - A method and system for controlling power consumption in a fibre channel switch element having a plurality of ports and plural links to communicate over a network is provided. The switch element includes, a power control module that is used to provide power to only active ports after firmware of fibre channel switch element determines the active ports. The method includes, determining active ports of the fibre channel switch element, after all the ports are shut down in a known state; and providing power to only the active ports. All ports are powered up during fibre channel switch element reset and then powered down (except a common port) so that the ports are shut down in a known state.05-14-2009
20100074616IN-LINE FIBER OPTIC MONITORS RESPONSIVE TO OPTICAL INTENSITY - Apparatus and methods to monitor optical intensity within optical fibers in a substantially non-invasive fashion are disclosed. Optical monitors are comprised of thin, conductive coatings applied to transparent substrates and patterned to form pairs of resistive elements, one of which intersects an optical beam propagating through optical fiber cables. Systems of distributed optical monitors interconnecting optical fiber links enable automated monitoring of the optical status across a communications networks.03-25-2010
20100074615SWITCH DEVICE, CONNECTION SYSTEM AND CONNECTION CONTROL METHOD - Reduction in power consumption at low costs is realized by a system with apparatuses connected with each other.03-25-2010
20130034353OPTICAL TRANSMISSION DEVICE AND OPTICAL TRANSMISSION METHOD - An optical transmission device includes: a spectral element configured to disperse an incident light beam in a first direction according to a wavelength of the incident light beam; a mirror array configured by a plurality of mirrors, each mirror having a reflective surface in which a reflection angle is adjustable and to which the incident light beam dispersed in the first direction is incident, the reflective surface being arranged on a plane formed by the first direction and a second direction orthogonal to the first direction; a plurality of ports arranged in the second direction; and a controller configured to adjust the reflection angle, so that a light beam reflected at the reflective surface is outputted to the port according to a region segmented in the second direction in the mirror array, the dispersed incident light beam that has a specified wavelength band being incident to the reflective surface.02-07-2013
20130077965METHOD AND APPARATUS FOR OPTICALLY OUTPUTTING INFORMATION FROM A SEMICONDUCTOR DEVICE - A method of optically outputting information (e.g. digital data) from a semiconductor device, the method comprising: providing a semiconductor device having a semiconducting p-n junction, the p-n junction having a region of reduced free charge carrier density; applying an electrical signal to modulate the extent of the said region, the electrical signal being representative of the information to be outputted; arranging incident light to pass through at least part of the said region, such that the light is at least partially absorbed in dependence upon the modulated extent of the said region, thereby producing intensity-modulated output light; and detecting the intensity of the output light and thereby determining the outputted information. Also provided is an electro-optical assembly, a package module for mounting a semiconductor device on a printed circuit board, and an integrated circuit chip.03-28-2013
20100098413PERFORMANCE MONITORING IN PASSIVE OPTICAL NETWORKS - One embodiment provides a system for performance monitoring in a passive optic network (PON). The system includes an optical line terminal (OLT) and an optical network unit (ONU). The OLT includes an optical transceiver configured to transmit optical signals to and receive optical signals from the ONU, and a performance monitoring mechanism configured to monitor performance of the PON based on received optical signals.04-22-2010
20090162056METHOD AND APPARATUS FOR MEASURING SIGNAL POWER LEVELS USING AN OPTICAL NETWORK TERMINATOR AND A SET TOP BOX - Methods, systems, apparatuses, and computer programs for measuring power levels of media signals in a communications network such as, for example, an FTTx network, using an Optical Network Terminal (ONT) and a Set Top Box (STB). A method for detecting a signal power level of a channel in a communication network includes (1) selecting a channel to be measured, and a corresponding node and user terminal communicatively coupled thereto, on the network, (2) detecting a signal power level of the selected channel at the corresponding node, (3) detecting a signal power level of the selected channel at the corresponding user terminal, (4) performing a comparison involving the detected signal power levels, and (5) providing a notification of a result of performing the comparison if the result exceeds a predetermined threshold.06-25-2009
20130039653DEVICE AND METHOD FOR PROCESSING AN OPTICAL SIGNAL - A method of processing optical signal (TE) whose power (P02-14-2013
20130045008Electric Field Measuring Apparatus - An electric field measuring apparatus measures electric field intensity of an electromagnetic wave generated from equipment under test installed in an area in which electromagnetic waves are detected. The apparatus includes an antenna, an RF amplifier amplifying an output signal of the antenna, a signal intensity detector detecting whether intensity of the output signal is higher than a predetermined level, a signal generator generating a detection result signal on the basis of a detection result of the signal intensity detector, a multiplexer multiplexing an output signal of the RF amplifier, the detection result signal, and a DC bias voltage, and an optical intensity modulator having a Mach-Zehnder type optical waveguide performing an optical modulation operation on the basis of an output signal of the multiplexer are arranged inside the area. Arranged outside the area are a light source unit, a receiver unit, a DC bias controller, and a display unit.02-21-2013
20130084065OPTICAL TRANSMITTER AND WAVEFORM COMPENSATION METHOD - An optical transmitter includes an EA modulator, a photocurrent detection circuit, a modulator drive circuit, and a CPU. The EA modulator converts an input signal into an optical signal and outputs the optical signal. The photocurrent detection circuit detects an optical absorption current (a photocurrent) in the EA modulator. The modulator drive circuit controls the EA modulator. The CPU calculates a voltage to be applied to the modulator drive circuit based on the optical absorption current detected by the photocurrent detection circuit.04-04-2013
20130071112Configuration Sub-System for Telecommunication Systems - Certain aspects are directed to a configuration sub-system for telecommunication systems. The configuration sub-system can include a test signal generator, a power measurement device, at least one additional power measurement device, and a controller. The test signal generator can be integrated into components of a telecommunication system. The test signal generator can provide a test signal to a signal path of the telecommunication system. The power measurement device and the additional power measurement device can respectively be integrated into different components of the telecommunication system. The power measurement device and the additional power measurement device can respectively measure the power of the test signal at different measurement points in the signal path. The controller can normalize signals transmitted via the telecommunication system by adjusting a path gain for the signal path based on measurements from the power measurement device and the additional power measurement device.03-21-2013
20130071109Automatic Gain Control for High-Speed Coherent Optical Receivers - Feed-forward and feedback strategies are used to control local oscillator power and transimpedance amplifier gain in a high-speed coherent optical receiver.03-21-2013
20130071111APPARATUS AND METHOD FOR MANAGING DYNAMIC BANDWIDTH ALLOCATION TO SUPPORT LOW-POWER MODE IN PASSIVE OPTICAL NETWORK (PON) - An apparatus and method for managing a dynamic bandwidth allocation to support a low-power mode, in a passive optical network (PON) are provided. The apparatus may include a power saving mode managing unit to manage a power saving mode of at least one optical network unit (ONU), a bandwidth allocation parameter storage unit to store a bandwidth allocation parameter used for a power saving mode, and to maintain the stored bandwidth allocation parameter, and a dynamic bandwidth allocating unit to provide bandwidth allocation information to the at least one ONU, when the stored bandwidth allocation parameter is received.03-21-2013
20130071110Providing Optical Power Information from an Optical Receiver to an Optical Transmitter Using a Serial Bus - An optical receiver, within a first device, may receive first configuration information from an optical transmitter, also within the first device. While receiving the first configuration information, the optical receiver may operate according to a clock. Later, the optical receiver may receive optical data from a second device according to the first configuration. While receiving the optical data from the second device, the optical receiver does not operate according to the clock, wherein the optical receiver not operating according to the clock allows the optical receiver to receive the optical data with greater sensitivity.03-21-2013
20130058648Variable Rate Optical Transmitter Based on All-Optical OFDM Super-Channel Technology - The present invention is directed to a method including determining an appropriate power level for a phase modulator for an optimum number of subcarriers; and applying the determined appropriate power level via a controller to produce the optimum number of subcarriers, wherein the optimum number of subcarriers enables an optical-orthogonal frequency division multiplex O-OFDM based variable rate transmitter with automatic control by a controller to produce an optimum setting based on a required rate.03-07-2013
20130058647TRANSIENT AND SWITCHING EVENT STABILIZATION OF FIBER OPTIC TRANSPORT SYSTEMS - A method and system for transient and switching stabilization of a fiber optic transport system. One or more data-bearing channels are coupled to an optical fiber. The data-bearing channels are distributed among a plurality of frequency sub-bands. A set of control channels is also coupled to the optical fiber. Each control channel includes a pair of signals at separate frequencies. There is at least one control channel in each of the plurality of frequency sub-bands. The pair of signals of a control channel are cross-polarized. Optical power in at least one of the plurality of sub-bands is measured. Responsive to the measured optical power, the optical power of a control channel is adjusted to maintain a substantially constant power of a sub-band that contains the adjusted control channel.03-07-2013
20110058808Channel Power Estimation Means - A channel power estimator for estimating the power of each channel in a wavelength division multiplexed (WDM) signal, comprising filter means to select and output a sub-band of an incoming WDM signal, function application means to apply a weighting function at least once to the output from the filter means and then output the weighted signal to reconstruction means, storage means for storing optical characteristic data on at least the function application means, wherein the reconstruction means calculates an estimation of the power distribution of the incoming WDM signal using the weighted signal and the optical characteristic data.03-10-2011
20130183032OPTICAL TRANSMISSION APPARATUS AND OPTICAL TRANSMISSION METHOD - An optical transmission apparatus includes an optical transmitter that includes a light emitting element and a driver circuit for the light emitting element, a temperature sensor that detects a temperature of the optical transmitter, and a controller that switches an operation mode of the optical transmitter from a normal mode to a low-power mode so as to reduce a heating effect to the light emitting element and allow an operation of the light emitting element to continue when the temperature detected by the temperature sensor is equal to or higher than a given temperature.07-18-2013
20090263127METHODS AND DEVICES FOR REDUCING POWER CONSUMPTION IN A PASSIVE OPTICAL NETWORK WHILE MAINTAINING SERVICE CONTINUITY - The present invention discloses methods for reducing power consumption in a PON while maintaining service continuity, the method including the steps of: providing an OLT operationally connected to at least one ONU; triggering a sleep request for at least one requesting ONU; upon receiving a sleep acknowledgement, activating a sleep mode for at least one requesting ONU according to a sleep period designated in the sleep request; and terminating the sleep mode according to the sleep period. Preferably, the sleep acknowledgement is transmitted from the OLT to the requesting ONU. Preferably, the sleep period is executed by a sleep command in the sleep acknowledgement. Preferably, the method further includes the step of: upon completion of the sleep period, transmitting buffered data traffic from the OLT to a sleeping ONU. Preferably, the step of transmitting is performed without the sleeping ONU being re-registered and without causing packet reordering.10-22-2009
20090274457Channel Monitor and Method for Estimating Optical Power - A method for estimating optical power in an optical channel includes determining a tunable filter full-width, FW11-05-2009
20090016716FIBER ARRAY UNIT WITH INTEGRATED OPTICAL POWER MONITOR - A technique for monitoring optical power in a fiber array unit having a plurality of optical transmission waveguides terminating at an edge thereof for carrying optical signals to and/or from a PLC. A tapping filter is placed within a slit formed in the substrate and interrupting the transmission channels, thereby tapping at least some of the optical power from the channels and directing the tapped optical power toward respective photodetector channels for detection, while allowing other optical power to continue transmission in the at least one channel of the fiber array unit.01-15-2009
20090016715POWER OVER OPTICAL FIBER SYSTEM - A system for providing power to remote equipment where a transmit unit having lasers transmits laser light over optical fiber to a receive unit having photovoltaic receivers. The photovoltaic receivers convert the laser light to electrical energy for the remote equipment. The receive unit also sends a feedback signal to the transmit unit which the transmit unit uses to determine whether the lasers should be enabled for full power.01-15-2009
20090310961METHOD AND APPARATUS FOR CALIBRATING BURST MODE LASER TRANSMITTERS - A method is provided to calibrate a monitor photodiode that measures the optical output power generated by an optoelectronic transceiver module that includes a burst mode laser diode. The method includes disabling the power control loop that controls an average optical output power generated by the laser diode during a laser burst. A series of logic zero signals is applied to a data input of the transceiver module and the logic zero level of the optical signal generated by the burst mode laser diode while applying the series of logic zero signals is measured. The logic zero bias level applied to the laser diode is adjusted until the measured logic zero level of the optical signal reaches a first desired value. While maintaining the optical signal at the first desired value, a first value of a current generated by the monitor photodiode in response to optical energy received from a back facet of the laser diode is stored. The first value of the current represents the calibrated value of the monitor current that will be measured when the laser generates a proper logic zero optical signal.12-17-2009
20080304824OPTICAL LINK QUALITY MONITORING IN A COMPUTER NETWORK - In one embodiment, a local network device collects local optical power information for at least one of either a local optical transmit interface and a local optical receive interface of the local network device. The local network device may then exchange the local information for remote optical power information of corresponding remote optical receive and transmit interfaces of a remote network device at an opposing end of at least one corresponding optical link (fiber). For example, an exchange may use a point-to-point protocol which may dynamically determine/discover neighboring relationships between capable peer device interfaces and establish a suitable communication exchange between the capable peers. Based on the local information and exchanged remote information, the local network device may calculate an optical power loss of each corresponding optical link.12-11-2008
20110091207Power Monitoring Photodiode Array with Integrated, Current Sourced Reference Photodiode - A photodiode array includes a plurality of monitoring photodiodes capable operating in a voltage mode configuration each able to provide a voltage indicating an intensity of an incident light. Integrated with the monitoring photodiodes is a reference diode configured to produce reference voltages in response to reference currents supplied to that diode. The monitoring photodiodes and the reference diode may be integrated and have the same current-voltage characteristics and the same temperature, for example by fabricating them on the same substrate. The reference diode is supplied with the reference currents in dark manner, meaning without incident light impinging on the reference diode. The resulting reference voltages, the reference source currents, and the measured photo-voltage from the monitoring photodiodes are than used to determine an optical power value at any temperature within the operation temperature range.04-21-2011
20120033966OPTICAL LEAKY INTEGRATE-AND-FIRE NEURON - An optical system includes an optical integrator, a readout mechanism, and an optical thresholder. The optical integrator is configured to perform temporal integration of an optical input signal having a first wavelength received at an input. The readout mechanism is coupled to the optical integrator and provides optical signals having a second wavelength to the optical integrator for measuring a state of the optical integrator. The optical thresholder is coupled to an output of the optical integrator and is configured to receive a signal representing a temporal integration of the optical input signal from the optical integrator and produce an optical signal identifying if an amplitude of the signal representing the temporal integration of the optical input signal is above or below a threshold value.02-09-2012
20110188853WAVELENGTH DIVISION MULTIPLEX TERMINAL WITH AUTOMATIC CONFIGURATION AND SUPERVISION OF SWITCH CONNECTIONS - A wavelength division multiplexer terminal with a multiplexer arrangement with a first switching matrix, and a demultiplexer arrangement with a second switching matrix allows flexibility for connection transceivers to ports of the wavelength division multiplexer and wavelength division demultiplexer respectively. Optical monitoring receivers are connected upstream the wavelength division multiplexer and downstream the wavelength division demultiplexer for managing and supervising connections.08-04-2011
20110188854OPTICAL RECEIVING APPARATUS AND OPTICAL TRANSMISSION SYSTEM - An optical receiving apparatus includes a variable dispersion compensation unit, a delay interference unit, a photoelectric converter, a polarization control unit for control the polarization state of an optical signal inputted to the photoelectric converter, a received data processing unit for monitoring the number of error occurrences, and a control unit for controlling the dispersion compensation amount at the variable dispersion compensation unit and the optical phase control amount at the delay interference unit, based on information on the number of error occurrences from the received data processing unit. The control unit adjusts the polarization state of the optical signal inputted to the photoelectric converter to a first polarization state, in which errors are more likely to occur than in normal operation, by controlling the polarization control unit and then starts control of the variable dispersion compensation unit and the delay interference unit, and upon completion of the control, adjusts the polarization state of the optical signal to a second polarization state, in which errors are less likely to occur than in the first polarization state, by controlling the polarization control unit.08-04-2011
20120106953Dual Laser-Power-Level Control and Calibration System for Burst-Mode and Continuous-Mode Transmitter - Dual laser-power-level control and calibration system for burst-mode and continuous-mode transmitter. A first signal path receives a transmit signal that also drives the transmit laser, and a second signal path receives the output of a monitor diode. The first and second signal paths include filtering so that the two signal paths have a similar frequency response. The upper and lower excursions in both signal paths are compared, and the power levels of the optical transmitter are adjusted based on those comparisons. Embodiments with one control loop and two control loops are disclosed.05-03-2012
20110170863PHASE MODULATED SIGNAL RECEIVER - A phase modulated signal receiver includes an operation part and a control part. An input power of a received light signal is measured based on current monitored by a monitor circuit. The operation part is configured to correct, on the basis of a ratio of the input power measured when a delay of a phase reference light output from a delay interferometer is a first delay and the input power when the delay of the phase reference light is a second delay, a value of the current monitored by the monitor circuit when the delay is the first delay to a corrected value that depends on the input power of the received light signal obtained when the delay is the first delay. The control part is configured to control the delay of the phase reference light of the delay interferometer by comparing the current monitored when the delay is the first delay and the corrected value of the current monitored when the delay is the second delay and maximizing or minimizing the current monitored by the monitor circuit.07-14-2011
20110222850SELF TEST OF A DUAL POLARIZATION TRANSMITTER - A method of testing a dual-polarization optical transmitter comprising a pair of polarization transmitters for respectively generating first and second polarization signals, and a polarization combiner for generating an optical signal composed of the first and second polarization signals with respective orthogonal polarization vectors. Each of the polarization transmitters is controlled to transmit respective polarization optical signals having predetermined characteristics. An output of the dual-polarization optical transmitter is tapped to obtain a first tap signal representative of the first polarization signal, and a second tap signal representative of the second polarization signal. A relative angle between respective polarization vectors of the tap signals is controlled, and the first and second tap signals combined to generate a combined light. A power level of the combined light is detected, and processed to obtain information about the performance of the dual polarization transmitter.09-15-2011
20130216220OPTICAL TRANSMITTER IMPLEMENTED WITH TWO QPSK MODULATORS MADE OF SEMICONDUCTOR MATERIAL AND A METHOD TO CONTROL OPTICAL POWER OUTPUT THEREFROM - An optical transmitter implemented with two QPSK (Quadrature Phase Shift Keying) modulators is disclosed. Each of the QPSK modulators provides a waveguide made of semiconductor material inducing the QCSE (Quantum Confined Stark Effect) by a bias supplied thereto. The optical performance of one of the QPSK modulators is determined by supplying a deep bias to the other of the QPSK modulator to eliminate the optical output therefrom.08-22-2013
20090310962Service based power and battery backup selection in a multiple dwelling unit - Heavy users of a Multi-Dwelling Unit Optical Network Terminal (MDU ONT) continuing to use services, such as telephone, data and video, when the MDU ONT is operating from backup power unfairly use the power available from the battery backup power supply. In other words, a heavy user uses more than his share of the power available at the battery backup power supply. Example embodiments of the present invention eliminate such unfairness by associating with each user a separate battery backup power supply dedicated to support that user's services. Therefore, the heavy user will drain his battery more quickly than a light or moderate user. In situations when power from a user's battery backup power supply is not available and an emergency or priority service is requested, the MDU ONT may allocate power from other user batteries, or its own central battery, to support the service.12-17-2009
20100221000METHOD AND DEVICE AND COMMUNICATION SYSTEM FOR MEASURING OPTICAL POWER - A method for measuring an optical power includes: acquiring code type information in an optical signal of a communication system, in which the optical signal includes an optical signal of burst emission and/or an optical signal of burst reception; measuring the optical signal of the communication system, and acquiring an optical power value of the optical signal; and correcting the optical power value according to the code type information.09-02-2010
20110243554PASSIVE OPTICAL NETWORK SYSTEM - When a neighbor ONU receives a signal with light intensity high enough to secure communication between an OLT and a remote ONU, the light intensity may be excessively high to damage a receiver of the neighbor ONU. In order to avoid such a problem, each ONU is notified of a downstream signal transmission plan (downstream light intensity map) prior to transmission of a downstream signal. Each ONU receives the downstream light intensity map (light intensity transmission schedule of downstream signal) in advance. Thus, the neighbor ONU can block or attenuate an optical signal addressed to the remote ONU, and the remote ONU can determine normal operation even when the remote ONU cannot receive a signal addressed to the neighbor ONU. Thus, the remote ONU can be prevented from issuing a wrong error signal.10-06-2011
20090245789Methods and Apparatus for Optical Modulation Amplitude Measurement - Techniques for measuring optical modulation amplitude (OMA) are disclosed. For example, a technique for measuring an OMA value associated with an input signal includes the following steps/operations. The input signal is applied to a photodetector, wherein the photodetector is calibrated to have a given responsivity value R, and further wherein the photodetector generates an output signal in response to the input signal. The output signal from the photodetector is applied to a radio frequency (RF) power meter, wherein the RF power meter measures the root mean squared (RMS) power value of the output signal received from the photodetector. The OMA value associated with the input signal is determined in response to the root mean squared (RMS) power value measured by the RF power meter. The OMA value may be determined as a function of a factor F derived from a relationship between an amplitude of a data signal and the RMS value of the data signal.10-01-2009
20110110661DYNAMIC DATA-RATE ADAPTIVE SIGNAL PROCESSING METHOD IN A WIRELESS INFRA-RED DATA TRANSFER SYSTEM - The invention relates to a switchable infrared filter, consisting of a diamond carrier material (05-12-2011
20090214204Optical network monitoring using amplifier modeling - Example embodiments include a method for monitoring an optical network. The method provides received network data to a network model, which determines if there is an inconsistency within the optical network. The network models include a statistical model and a detailed-physical model, both of which model amplifier physics.08-27-2009
20110085800APPARATUS AND METHOD FOR MONITORING RECEIVED OPTICAL POWER IN AN OPTICAL RECEIVER OVER A WIDE RANGE OF RECEIVED POWER WITH HIGH ACCURACY - A method and apparatus for use in an optical receiver are provided for monitoring the received optical power in the optical receiver over wide range of optical power levels with high accuracy. An adjustable resistor circuit of the apparatus has a first resistor and one or more second resistors that may be switched into and out of parallel with the first resistor to vary the resistance of the adjustable resistor circuit. A controller of the optical receiver controls the switching of the one or more second resistors into and out of parallel with the first resistor. Varying the resistance of the adjustable resistor circuit in this manner causes the value of the analog voltage signal representing the received optical power to be varied prior to being input to the ADC of the controller. In this way, the amplitude of the analog voltage signal is reduced when it is at the high end of the received power range so as not to exceed the input range of the ADC of the controller IC. When the amplitude of the analog voltage signal is at the lower end of the input range of the ADC, the amplitude of the analog voltage signal is not reduced. In this way, a wide range of received power is monitored with high accuracy.04-14-2011
20110129217Transmitter Disabling Device - An optical transmitter disabling device for controlling an optical transmitter, particularly of an optical network termination node of a passive optical network comprising a monitoring module and a disabling module, the monitoring module being adapted to determine at least when the optical transmitter is active, the disabling module being adapted to be connected to an activation input of the optical transmitter and wherein the disabling module is adapted to interrupt an activation signal to the optical transmitter at least when the monitoring module determines that the optical transmitter is active outside of a predetermined time interval.06-02-2011
20110243555CHANNEL POWER CONTROL IN AN OPTICAL LINK - Methods and apparatus for control of variable optical attenuators are described. A method for control of a variable optical attenuator located in an optical link comprising a plurality of optical attenuators. The method comprises determining that an initial calibration step of a variable optical attenuator has been completed, and transmitting a signal indicative of the variable optical attenuator having completed the initial calibration step for receipt by a downstream variable optical attenuator. A method of controlling a variable optical attenuator comprises receiving a signal indicative of an upstream variable optical attenuator having completed an initial calibration step, and initiating calibration of the variable optical attenuator in response to receipt of said signal.10-06-2011
20110176802Channel Power Control in an Optical Network Node - A method and apparatus suitable for controlling the power of a channel in an optical network are described. A control system for a variable optical attenuator includes a processing element arranged to: (a) receive a signal indicative of the radiation power of an optical signal output from a variable optical attenuator; (b) determine an error signal in dependence upon the received signal and a predetermined target radiation power level; (c) determine a control signal for controlling the attenuation of the variable optical attenuator in dependence upon the error signal and a gain factor; and (d) repeat the operations of (a) to (c). The control system is arranged to utilize a first value of the gain factor during a first time period and a second, lower value of the gain factor during a second time period. Such a control system can be used to control the introduction of a channel in a node of an automatically switched optical network.07-21-2011
20090028556METHOD AND APPARATUS FOR MONITORING THE POWER LEVEL OF TWO OR MORE OPTICAL TRANSMITTERS - Methods and apparatus for monitoring the power level of one or more optical emitters are provided. In some embodiments, optical signals from two or more optical emitters are directed at different regions of a photo detector. The photo detector may include two or more spaced contacts that are adapted to receive different contributions of photo current from each of the optical signals. By monitoring the photo currents in the two or more spaced contacts, a measure of the optical power of each of the optical signals may be determined.01-29-2009
20120121259OPTICAL TRANSMISSION DEVICE AND OPTICAL TRANSMISSION METHOD - An optical transmission device includes a first power monitor to monitor a first signal into which second signals with respectively different wavelengths are multiplexed so as to measure received power of the first signal; an amplifier to amplify the first signal, to generate a third signal; a driver to drive the amplifier; a demultiplexer to separate the third signal into fourth signals with the different respectively wavelengths; second power monitors each to monitor each of the fourth signals so as to measure received power of each of the fourth signals; a memory to store therein data related to gain in the amplifier, the data corresponding to each of wavelengths of the second signals, with respect to parameters which are the received power measured by the first power monitor and driving condition; and a processor to calculate power of each of the second signals.05-17-2012
20080253765OPTICAL POWER MEASURING APPARATUS AND OPTICAL SIGNAL RECEIVING APPARATUS COMPRISING SAME - An optical power measuring apparatus for measuring a power level of an optical signal comprised of a light intensity modulated signal, received by a light receiving element is provided. In the apparatus, a first signal path including a first voltage detection circuit and a first amplifier circuit supplies a processor with a first signal having a voltage proportional to a current flowing through a light receiving element (PD), and a second path including a TIA, a DC detection circuit and a second amplifier circuit supply the processor with a second signal. The second signal corresponding to an envelope of a voltage from the TIA. The processor compares the level of the first signal with a predetermined set value to select an optical power value retrieved based on the first signal when the level of the first signal is equal to or higher than the set value, and to select an optical power value retrieved based on the second signal when lower than the set value, and outputs the selected optical power value as a measured optical power value Pout. An output signal of the TIA can be supplied to an external device, so that the optical power measuring apparatus can measure an optical power level while serving as an optical signal receiving apparatus.10-16-2008
20110164874Method for optimally adjusting a decision level of a receiver and device thereof - The present invention discloses a method and a device for optimally adjusting the decision level of a receiver, wherein the method includes: monitoring optical power received by an optical receiver; determining whether the variation amplitude of the optical power is greater than a predefined value; if yes, then updating a current initial value of the decision level according to the optical power; obtaining an error signal of a transmitted signal from the output end of the optical receiver; determining whether the decision level needs adjusting according to the error signal; if yes, then further analyzing the error signal according to the current initial value to obtain the result of the analysis; otherwise, exiting the execution program directly; and adjusting the decision level from the current initial value according to the result of the analysis. By monitoring the received optical power and setting the initial value of the decision level according to the received optical power, the method and the device avoid the interruption in the system service caused by a long search for the initial value of the decision level due to the variation of the optical power and thus greatly improve the stability of the system.07-07-2011
20110013907MULTI-VALUE OPTICAL TRANSMITTER - Provided is a multi-value optical transmitter in which a DC bias may be controlled to be stabilized so as to obtain stable optical transmission signal quality in multi-value modulation using a dual-electrode MZ modulator. The multi-value optical transmitter includes: D/A converters for performing D/A conversion on first and second modulation data which are set based on an input data series, so as to generate a first and a second multi-value signal, respectively; a dual-electrode MZ modulator including phase modulators for modulating light from a light source based on the first multi-value signal and the second multi-value signal, so as to combine optical signals from the phase modulators to output the optical multi-value signal; an optical output power monitor for detecting average power of the optical multi-value signal; and a DC bias control unit for controlling a DC bias for the dual-electrode MZ modulator, so as to maximize the average power.01-20-2011
20110076014Transmission Network Having an Optical Receiver that Utilizes Dual Power Pins and a Single Status Pin to Lower Power Consumption, Lower Manufacturing Cost, and Increase Transmission Efficiency - A communication network is provided for interconnecting a network of digital systems, such as multimedia devices. Each node of the communication network may include a receiver and a transmitter. The receiver and transmitter of each node can be an optical receiver and transmitter. The optical receiver is preferably powered by two power supply pins, each providing different supply amounts. An activity detector within the receiver can be powered from a first supply amount, and the signal path of the optical receiver can be supplied from a second supply amount greater than the first supply amount. The first supply amount is provided at all times, and the second supply amount is only provided if activity is detected. A voltage regulator which provides the first supply amount can be beneficially embodied on the same integrated circuit as a network interface to reduce the manufacturing cost of the network. By powering the activity detector separate from the signal path, power down and power up (normal) operating states are envisioned for reducing power consumption and increasing longevity of the optical receiver and transmitter.03-31-2011
20100215363Optical transmitter - In an optical transmitter comprising a directly modulated laser and a wavelength filter provided on a post-stage of the directly modulated laser, the wavelength filter has a modulated light input port for inputting modulated light output from the directly modulated laser, a filter transmitted light output port for outputting light having a wavelength included in a filter transmission band among the modulated light as filter transmitted light, and a filter cutoff light output port provided separately from the modulated light input port and the filter transmitted light output port and outputting light having a wavelength included in a filter cutoff band among the modulated light as filter cutoff light, and the peak of the filter transmission band is set on a shorter-wave side from the peak of the spectrum of modulated light output from the directly modulated laser.08-26-2010
20090175619Burst Power Measurements Using Averaged Power Measurement - An apparatus comprising an individual optical power level calculation (IOPLC) module and a transceiver coupled to the IOPLC module and configured to communicate with a plurality of optical network units (ONUs). Also disclosed is an apparatus comprising a control and management (CM) module, an average power level measurement (APLM) module coupled to the CM module, a first transceiver coupled to the CM module and configured to communicate with an optical line terminal (OLT), and a second transceiver coupled to the CM module and the APLM module, and configured to communicate with a plurality of ONUs.07-09-2009
20080304825Methods, Systems, and Computer-Readable Media for Providing Notification of a Power Failure - Methods, systems, and computer-readable media provide for notifying an optical line termination (OLT) of a power failure. According to embodiments, a method for notifying an OLT of a power failure is provided. According to the method, a notification of a power failure at an optical network termination (ONT) is received. In response to receiving the notification, power is retrieved from a dedicated power storage unit dedicated to providing power for the transmission of a dying gasp alarm. The dying gasp alarm is transmitted to the OLT utilizing at least a portion of the power from the dedicated power storage unit. The dying gasp alarm notifies the OLT of the power failure.12-11-2008
20110305454OPTICAL TRANSCEIVERS WITH CLOSED-LOOP DIGITAL DIAGNOSTICS - Systems and methods for performing closed-loop diagnostics in optical transceiver. The TOSA of an optical receiver includes a primary transmit module and a secondary receiver module. The transmit module transmits a data signal to a ROSA of another optical transceiver. The ROSA has a secondary transmit module that can transmit a diagnostic data signal back to the secondary receiver module of the TOSA. The TOSA can use the diagnostic data received from the ROSA to automatically adjust itself and perform closed-loop feedback functions. The closed loop diagnostics can be implemented in a network where one transceiver may be connected with more than one other transceiver in a multi-node configuration.12-15-2011
20120099857OPTICAL LINE TERMINAL - An optical line terminal (OLT) includes an optical receiving assembly and a processor (04-26-2012
20120045202High Speed Bi-Directional Transceiver, Circuits and Devices Therefor, and Method(s) of Using the Same - The present disclosure relates to a high-speed and/or power-saving bi-directional transceiver. The transceiver generally includes a (burst) laser driver; an output power monitoring and indicating circuit; control logic (e.g., a microcontroller unit); bi-directional optics; a photodiode bias control circuit; a limiting amplifier; and a receiver optical power monitoring circuit. Optionally, the present transceiver includes a small form factor pluggable (SFP+) connector housing. In addition, the power-saving bi-directional transceiver generally includes a transmitter (TX) energy-saving circuit, a TX burst holding circuit, a receiver (RX) energy-saving circuit, a RX continuous holding circuit and the control logic.02-23-2012
20120045201MONITORING ENERGY CONSUMPTION IN OPTICAL ACCESS NETWORKS - An optical access network (02-23-2012
20100260497METHOD OF SAVING POWER IN OPTICAL ACCESS NETWORK - Provided is a method of reducing power consumption of an optical access network (OAN) as much as possible by configuring an optical line terminal (OLT) and optical network terminals (ONTs) in the OAN to support a maximum power-saving mode. According to the method, upon the application of power, an ONT operates normally in an activation mode. The ONT then determines whether the requirements for switching from activation mode to power-saving mode are satisfied. If the requirements are satisfied, the ONT transmits a sleep signal to an OLT, which is a message notifying that the ONT will soon switch to power-saving mode. Thereafter, the ONT switches to power-saving mode and cuts off power for all functions except for power for monitoring and controlling external inputs. The ONT then determines whether the requirements for switching from power-saving mode to activation mode are satisfied. If the requirements are satisfied, the ONT transmits a wake-up signal to the OLT and switches to the activation mode for normal operation.10-14-2010
20110097081Method and System for Protection Switching - A method is provided for protection switching in an optical network. The method may include: (i) establishing a baseline power level for a channel and a threshold value for the channel approximately equal to a predetermined threshold value; (ii) receiving a signal associated with the channel via each of a first path of the optical network and a second path of the optical network; (iii) monitoring a power intensity of the signal received via the first path; (iv) determining an average power intensity of the signal received via the first path based on the monitored power intensity; (v) modifying at least one of the baseline power level and the threshold value in response to a determination that the average power intensity exceeds the baseline power level; and (vi) protection switching from the signal received via the first path to the signal received via the second path in response to a determination that the baseline power level exceeds the power intensity of the signal received via the first path by the threshold.04-28-2011
20110097080Method and System for Protection Switching - A method is provided for protection switching in an optical network. The method may include establishing a baseline power level for a channel. The method may further include receiving a signal associated with the channel via each of a first path of the optical network and a second path of the optical network. The method may also include monitoring a power intensity of the signal received via the first path. The method may additionally include protection switching from the signal received via the first path to the signal received via the second path in response to a determination that the baseline power level exceeds the power intensity of the signal received via the first path by a predetermined threshold.04-28-2011
20120020662OPTICAL POWER MEASUREMENT METHOD, OPTICAL LINE TERMINAL AND OPTICAL NETWORK UNIT - The embodiments of the present invention relate to communications technology, and disclose an optical power measurement method, an Optical Line Terminal (OLT), and an Optical Network Unit (ONU). The method includes: generating a Physical Layer Operation Administration Maintenance (PLOAM) message that includes an identifier of at least one ONU to be measured and information about a time bucket that is allocated to the ONU to be measured and is used for sending upstream optical signals; sending the PLOAM message to the multiple ONUs; receiving the upstream optical signals that are sent, in the allocated time bucket, by the ONU to be measured; and detecting the received upstream optical signals, and determining the optical power of the upstream optical signals. The present invention avoid waste of bandwidth caused in the prior art when the DBA is required to allocate bandwidth to the ONU to be measured for the purpose of detecting the optical power.01-26-2012
20110091208TESTING OPTICAL NETWORKS - A device may include a communication interface to communicate with an optical line terminal and a processor. The processor may set an optical path from the optical line terminal to an optical network terminal, the optical path including one or more optical network elements. In addition, the processor may obtain, from the optical line terminal, a status reading of the optical network terminal when the optical path is set. Further, the processor may obtain, from the optical line terminal, a power reading at the optical network terminal when the optical path is set. The processor may record the status reading and the power reading.04-21-2011
20120134669METHODS AND SYSTEMS FOR MULTICAST CONTROL - Disclosed are a system and a method for controlling multicast data. The system may comprise: a plurality of transceivers, each of which comprises a laser configured to generate an optical carrier, the generated optical carrier being modulated by electrical downstream p-t-p data so as to generate optical downstream p-t-p IRZ signal; a PM configured to modulate the generated optical downstream p-t-p IRZ signal by electrical multicast data so as to generate orthogonally modulated signal; and a DI configured to demodulate the orthogonally modulated data and has a frequency response peak or dip in response to the demodulating, wherein an offset of a laser center wavelength of the laser from the frequency response peak or dip is adjustable so as to selectively enable or disable the multicast data.05-31-2012
20120163810OPTICAL DEVICE, OPTICAL TRANSCEIVER UNIT, AND OPTICAL COMMUNICATION SYSTEM - An optical device includes an optical element that is secured to a base material, a temperature variable element the temperature of which is variable, the temperature variable element being secured to the base material such that light propagates between the temperature variable element and the optical element, a housing that houses the optical element and the temperature variable element, and a heat conducting medium that is disposed at a position that is different from a position of the base material and away from an optical path through which the light propagates, the heat conducting medium physically contacting the optical element and the temperature variable element.06-28-2012
20120177369Automatic Power Adjustment System and Method for Optical Network System - An apparatus and method for automatic power adjustment of an optical network system are provided by the present invention. In the automatic power adjustment system which includes a plurality of electric-adjustable optical attenuators and a power adjustment module configured in a network management board: each OA board, i.e. optical amplification board and each service forwarding board respectively report their power relevant parameters to the power adjustment module; the power adjustment module judges whether an adjustment is required for an OA board and/or a service forwarding board after performing calculation according to the power parameters reported by each OA board and each service forwarding board, and when determining that the adjustment is required, triggers the adjustable optical attenuator on the corresponding OA board and/or the service forwarding board to perform the power adjustment.07-12-2012
20120177368OPTICAL TRANSMISSION APPARATUS AND ANALOG-TO-DIGITAL CONVERSION APPARATUS - In an optical transmission apparatus, an optical-to-electrical converter converts a received optical signal into an electrical signal, and an amplifier amplifies the resulting electrical signal. A plurality of analog-to-digital converters then convert the amplified electrical signal from analog form to digital form in a time-interleaved manner to produce digital outputs. When correcting the analog-to-digital converters, a controller varies the gain of the amplifier in such a way that a total amplitude or an average amplitude indicated by the digital outputs of the analog-to-digital converters will be equal to or greater than a specified threshold.07-12-2012
20120263460ADAPTIVE SETTING OF TRANSMIT POWER IN OPTICAL TRANSCEIVERS - Adaptive power setting techniques for optical transceivers are provided. Optical signals are received at a first optical transceiver device that are transmitted from a second optical transceiver device. A receive power of the optical signals received at the first optical transceiver device from the second optical transceiver device is determined. A characteristic of optical signals transmitted by the first optical transceiver device to the second optical transceiver device is modulated to indicate to the second optical transceiver device a disparity of the receive power with respect to a target receive power level at the first optical transceiver device. Conversely, the first optical transceiver device adjusts a power level of optical signals transmitted by the first optical transceiver device to the second optical transceiver device based on a characteristic of the optical signals received at the first optical transceiver device.10-18-2012
20120082450MONOLITHIC POWER MONITOR AND WAVELENGTH DETECTOR - Monolithic single and/or dual detector structures are fabricated on the emitting surface of a VCSEL and/or on a lens or glass substrate configured to be positioned along the axis of emission of an optical light source. Each monolithic detector structure includes one or two PIN detectors fabricated from amorphous silicon germanium with carbon doping or amorphous germanium with hydrogen doping. The monolithic detectors may additionally include various metallization layers, buffer layers, and/or anti-reflective coatings. The monolithic detectors can be grown on 1550 NM VCSELs used in optical transmitters, including lasers with managed chirp and TOSA modules, to reduce power and real estate requirements of the optical transmitters, enabling the optical transmitters to be implemented in long-reach SFP+ transceivers.04-05-2012
20120230684Burst Power Measurements Using Averaged Power Measurement - An apparatus comprising an individual optical power level calculation (IOPLC) module and a transceiver coupled to the IOPLC module and configured to communicate with a plurality of optical network units (ONUs). Also disclosed is an apparatus comprising a control and management (CM) module, an average power level measurement (APLM) module coupled to the CM module, a first transceiver coupled to the CM module and configured to communicate with an optical line terminal (OLT), and a second transceiver coupled to the CM module and the APLM module, and configured to communicate with a plurality of ONUs.09-13-2012
20120230683System and Method for Remotely Monitoring Communication Equipment and Signals - Several systems and method for remotely monitoring a communication system are disclosed. An RF signal received at a remote facility is analyzed at the remote facility and an ancillary data signal including information relation to at least one characteristic of the RF signal is generated. The ancillary data signal is modulated and combined with the RF signal. The combined RF signal is transmitted to a local facility in an optical form, where the ancillary data signal is recovered. An ancillary data signal block provides control signal in response to the local ancillary data signal. The control signals may be local control signals for controlling local devices or remote control signals for controlling devices at the remote facility. The ancillary data may include a power level of the RF signal and a version of the RF signal may be generated at the local facility with a power level approximately equal to the power level of the original RF signal.09-13-2012
20110038627ALLOCATION OF TRANSMISSION POWER IN AN OPTICAL COMMUNICATION SYSTEM - Methods and apparatus for determining transmission power of a plurality of optical channels for transmission of the channels along respective paths obtained through an optical transmission system. Information is obtained indicative of the path of each channel through the optical transmission system, and each channel allocated to a group of channels in dependence upon the obtained information. A quality metric is determined for each group of channel, and a total transmission power for each group determined in dependence upon the determined quality metric.02-17-2011
20120269508OPTICAL TRANSMITTER AND OPTICAL TRANSMISSION APPARATUS - An optical transmitter includes a laser configured to emit light, a power of the light increasing with temperature decreasing, a Faraday rotator configured to rotate a polarization direction of the light in accordance with the temperature, and a first polarizer that has a principal axis inclined at a given angle and inputs the light output from the Faraday rotator.10-25-2012
20120128351COMMUNICATION SYSTEM, MEASURING APPARATUS, TRANSMITTING APPARATUS, AND MEASUREMENT METHOD - A communication system including: a transmission apparatus configured to modulate a first light by using a first signal to be transferred and a second signal having a frequency different from a frequency of the first signal so as to generate a first optical signal, modulate a second light by using a third signal to be transferred and a fourth signal having a frequency different from a frequency of the third signal so as to generate a second optical signal, polarization-multiplex the first optical signal and the second optical signal, and transmit a polarization-multiplexed optical signal in which the first optical signal and the second optical signal are polarization-multiplexed, each of the first light and the second light being polarized; and a measuring apparatus configured to measure powers of the second signal and the fourth signal which are included in the polarization-multiplexed optical signal transmitted from the transmission apparatus.05-24-2012
20100232791COMMUNICATION DEVICE AND LIGHT GUIDING MEMBERS USED THEREIN - A communication device includes an enclosure including a recess member including a bottom wall and an accommodating portion, a circuit board mounted on the bottom wall, and a light guiding member received in the accommodating portion. The circuit board includes a plurality of light sources arranged in a circular array. The light guiding member includes a light guiding portion to transmit light from the light sources to an outer surface of the communication device and a light shielding portion to shield the light to the outer surface and fix the light guiding portion in the accommodating portion. The light guiding portion includes a light guiding bottom wall surrounding the light sources and a light guiding sidewall. The light guiding sidewall includes an annular end surface to indicate signal strength and a strong signal orientation received by an antenna of the communication device.09-16-2010
20110158643Optical transmission module and wavelength control method of optical transmission module - An optical transmission module includes a variable wavelength light source; an alternating current adding unit that adds an alternating current to a drive current to the variable wavelength light source; a first detector to detect optical power of an output light; a filter to input the output light from the variable wavelength light source in which transmission wavelength periodically increases and decreases; a second detector to detect optical power of transmitted light transmitted through the filter; an extraction unit to extract a wavelength fluctuation component of the output light based on the optical power of the output light and the optical power of the transmitted light; a phase comparison unit to compare a phase of the wavelength fluctuation component with a phase of the alternating current; and a wavelength controller to control a wavelength of the output light by controlling a temperature of the variable wavelength light source.06-30-2011
20120251104Modulator Control System and Method in an Optical Network - The invention relates to an optical modulator control system implemented in an optical burst mode transmitter, said control system comprising means for measuring a plurality of optical power sample values and associated optical wavelength data values from a modulator at a first sampling rate, wherein an average power table is generated from said values for each sample period and stored in a memory. The control system also comprises means for performing a control error calculation from two or more stored average power tables at a second sampling rate to calculate a single error value to provide gain and/or bias control signals, wherein the second sample rate is sampled at a slower rate than the first sample rate. The control system described optimises the modulator performance over temperature and lifetime in an optical network.10-04-2012
20130094854Self-Characterization Tunable Optical Network Unit - A tunable optical transmitter, comprising a tunable laser comprising a distributed Bragg reflector (DBR) section, a phase section, and a gain section, a photodiode detector (PD) optically coupled to the tunable laser, wherein the tunable optical transmitter lacks a temperature controller, and wherein the tunable optical transmitter is configured to lock onto a wavelength at different operating temperatures.04-18-2013
20130101285METHOD AND SYSTEM FOR INDOOR WIRELESS OPTICAL LINKS - Embodiments of the present invention are directed to a system and method for indoor wireless optical communication. The system may include a central unit and a plurality of user units. A bi-directional optical communication link may be established over a collimated invisible light beam to enable transmission of wireless communications between a remote communication device and a user unit. The central and user units include an optical transmitter. At least one of the user unit and the central unit comprises a visible light source configured to produce a collimated visible light beam to enable alignment of the user unit and the central unit upon establishment of the bi-directional optical communication link.04-25-2013
20130148962Methods, Apparatuses, and Systems for Monitoring Signal Strength in an Optical Network - An optical transceiver, optical network and methods for using the same are disclosed. The optical transceiver and/or optical network and related methods may be useful for independently monitoring the optical transceiver and/or optical network. The optical transceiver generally includes an optical receiver configured to receive optical information; circuitry configured to calculate signal strength values of the received optical information from a plurality of remote optical transmitters; logic configured to process the signal strength values for each of the plurality of remote optical transmitters; and one or more memories configured to store the signal strength values. Optionally, the optical transceiver may notify a system or host when the transceiver, network or component thereof is operating outside a predetermined threshold.06-13-2013
20120275784System and Method for Optical Layer Management in Optical Modules and Remote Control of Optical Modules - A system and method for managing the optical layer network data communications of an optical fiber data network by an optical transceiver module is disclosed. The management of the optical layer network data communications comprising data link layer functions or layer 2 functions in an OSI model. Benefits include reduction in reduced cost of network deployments from consolidation of network equipment, such as switches, and reduction in power consumed as well as enabling point-to-multipoint network connections from previously only point-to-point network connection.11-01-2012
20130156424APPARATUS FOR MEASURING PERFORMANCE OF COHERENT OPTICAL RECEIVER - An apparatus for measuring performance of a coherent optical receiver includes a beam splitter splitting light into first and second paths, a first optical modulator modulating the first path light, a variable optical attenuator controlling an optical power of the first optical modulator, a first polarization controller transmitting a signal controlling polarization of an output of the variable optical attenuator to the coherent optical receiver, a second optical modulator modulating the second path light, a variable optical delay line delaying time of an output of the second optical modulator, a second polarization controller transmitting a signal controlling polarization of an output of the variable optical delay line to the coherent optical receiver, a network analyzer measuring performance of the coherent optical receiver and controlling the optical modulators, and a controller transmitting a control signal to the optical modulators.06-20-2013
20110305453METHOD AND ARRANGEMENT FOR ADAPTIVE DISPERSION COMPENSATION - A received optical signal is coherently demodulated and converted into electrical complex samples, which are dispersion compensated in a compensation filter. A control circuit calculates comparison values from corrected samples and an estimated error value. A plurality of compensation functions is applied according to a predetermined dispersion range and after a second iteration, the compensation filter is set to an optimum compensation function.12-15-2011
20110311223WAVEFORM RECONSTRUCTION DEVICE, WAVEFORM RECONSTRUCTION SYSTEM, AND WAVEFORM RECONSTRUCTION METHOD - Provided is a waveform reconstruction device capable of easily reconstructing an accurate time waveform of an optical signal without using an ultrafast time gate or a reference light source. A waveform reconstruction device (12-22-2011
20130195448Spectral Encoding of an Optical Label or Destination - An apparatus comprising a processor, wherein the processor is configured to determine a plurality of available wavelengths that are available to transmit data over an optical network comprising a plurality of downstream nodes, select a plurality of encoding wavelengths from the available wavelengths, wherein the encoding wavelengths are a subset of the available wavelengths, apply a plurality of relative power levels to the encoding wavelengths, and encode the data using the encoding wavelengths and the relative power levels, wherein the encoding wavelengths and the relative power levels dictate the switching behavior of the downstream nodes when the data is received by the downstream nodes.08-01-2013
20120033965Method and Apparatus for Broadband Carrier Frequency and Phase Recovery in Coherent Optical System - A digital apparatus comprising a fast Fourier transform (FFT) module configured to transform a time domain optical signal into a frequency domain optical signal, a circular shifter coupled to the FFT module and configured to provide coarse frequency offset compensation to the frequency domain optical signal based on an estimated frequency offset; and a frequency offset estimation module coupled to the circular shifter and configured to provide the estimated frequency offset based on a power spectrum of the frequency domain optical signal or a data block header autocorrelation of the time domain optical signal.02-09-2012
20120039602Method and Apparatus for Detecting Rogue Optical Network Unit in Passive Optical Network - A method performed in an optical line terminal (OLT) in a passive optical network (PON) for detecting a rogue optical network unit (ONU) operating among a plurality of ONUs in the PON. The OLT receives a plurality of bursts of light from a plurality of ONUs, each burst being separated from other bursts by an inter-burst gap containing a minimum dark interval during which the OLT expects to receive no optical power. The OLT measures the received optical power during one or more of the minimum dark intervals of the inter-burst gaps and determines whether the inter-burst gaps were anomalous. In response to determining that an inter-burst gap was anomalous, the OLT increments an anomaly count that indicates a rogue ONU has been detected when the anomaly count exceeds an anomaly count threshold. When the anomaly count is exceeded, the OLT declares an alarm associated with the presence of a rogue ONU, and may also initiate rogue isolation diagnostics.02-16-2012
20130202293Systems and Methods for Ethernet Passive Optical Network Over Coaxial (EPOC) Power Saving Modes - Systems and methods for Ethernet Passive Optical Network Over Coaxial (EPOC) power saving modes are provided. The EPOC power savings modes allow an EPOC coaxial network unit (CNU) to enter a sleep mode based on user traffic characteristics. The sleep mode may include powering down one or more module of the EPOC CNU, including radio frequency (RF) transmit/receive circuitry and associated circuitry. In embodiments, the EPOC CNU may enter sleep mode based on instructions from an optical line terminal (OLT) or based on its own determination. Embodiments further include systems and methods that allow the EPOC CNU to maintain synchronization with a servicing coaxial media converter (CMC) when it enters a sleep mode.08-08-2013
20120093504Optoelectronic Transceiver with Multiple Flag Values for a Respective Operating Condition - An optoelectronic transceiver includes an optoelectronic transmitter, an optoelectronic receiver, memory, and an interface. The memory is configured to store digital values representative of operating conditions of the optoelectronic transceiver. The interface is configured to receive from a host a request for data associated with a particular memory address, and respond to the host with a specific digital value of the digital values. The specific digital value is associated with the particular memory address received form the host. The optoelectronic transceiver may further include comparison logic configured to compare the digital values with limit values to generate flag values, wherein the flag values are stored as digital values in the memory.04-19-2012
20120093503DYNAMICALLY OPTIMIZING A DECISION THRESHOLD VOLTAGE IN AN OPTICAL TRANSPONDER - A transponder having a dynamic remapping circuit remaps a value of decision threshold voltage Vdtc and a value of optical power RXP to a reference voltage Vref to minimize the bit error rate BER of a communication system. The dynamic remapping circuit implements a bilinear mapping of Vdtc and RXP to Vref with three bilinear remapping constants “a”, “b”, and “c” selected to align a remapped value of Vdtc_opt to a selected Vdtc normalization value, Vdtc_norm. A transponder in accord with an embodiment of the invention prevents BER from exceeding a threshold value of BER whether RXP or OSNR, or both, remain constant, change continuously, or change intermittently. Constants “a”, “b”, and “c” are related to parameters resulting from mathematically fitting a line to data comprising Vdtc_opt versus RXP. Another embodiment comprises a method for dynamically optimizing Vdtc and RXP to Vref in a transponder with a bilinear remapping circuit.04-19-2012
20130209097Photonic Monitoring For Optical Signals - This invention concerns real-time multi-impairment signal performance monitoring, [n particular it concerns an optical device, for instance a monolithic integrated photonics chip, comprising a waveguide having an input region to receive a signal for characterization, and a narrow band CW laser signal. A non-linear waveguide region to mix the two received signals. More than one output region, each equipped with bandpass filters that extract respective discrete frequency bands of the RF spectrum of the mixed signals. And, also comprising (slow) power detectors to output the extracted discrete frequency banded signals.08-15-2013

Patent applications in class Power