Patent application number | Description | Published |
20110149270 | Enhanced OTDR Sensitivity by Utilizing Mode-Field Diameter Measurements - Described herein are systems and methods for enhancing sensitivity of an optical time-domain reflectometer (“OTDR”) using bi-directional analysis techniques. One embodiment of the disclosure of this application is related to a computer readable storage medium including a set of instructions that are executable by a processor. The set of instructions being operable to collect a first set of measurement data at a first resolution to provide a relative backscatter of the fiber, collect a second set of measurement data taken at a second resolution to calculate loss along the length of fiber, and combine the first set of measurement data with the second set of measurement data to calculate the loss along the fiber at the first resolution. | 06-23-2011 |
20110149271 | Enhanced Optical Time-Domain Reflectometer Resolution Using Depolarization of Light Source - Described herein are systems and methods for enhancing the resolution of an optical time-domain reflectometer (“OTDR”). One embodiment of the disclosure of this application is related to a device, comprising an optical measuring component collecting a first set of measurement data from a forward trace along an optical fiber with the optical measuring device using depolarized light, and a processing component calculating loss along the length of fiber. The optical measuring device further collects a second set of measurement data from a backward trace along the optical fiber with the optical measuring device using depolarized light. | 06-23-2011 |
20110153543 | Fiber Identification Using Optical Frequency-Domain Reflectometer - Described herein are systems and methods for uniquely identifying, or “fingerprinting,” optical fibers based upon hi-resolution measurements of the backscattered light, such as can be performed by an optical frequency-domain reflectometer (“OFDR”). One embodiment of the disclosure of this application is related to a computer readable storage medium including a set of instructions that are executable by a processor. The set of instructions being operable to retrieve a profile for an intended fiber, the profile including unique measurement data of the intended fiber, receive from the OFDR further measurement data from a connected fiber within a network, compare the unique measurement data of the intended fiber to the further measurement data of the connected fiber, and confirm an identity of the connected fiber as being the intended fiber when the unique measurement data matches the further measurement data, and trigger an alert when the unique measurement data does not match the further measurement data. | 06-23-2011 |
20110153544 | Fiber Identification Using Mode Field Diameter Profile - Described herein are systems and methods for uniquely identifying, or “fingerprinting,” optical fibers based upon measurements from an optical time-domain reflectometer (“OTDR”). One embodiment of the disclosure of this application is related to a computer readable storage medium including a set of instructions that are executable by a processor. The set of instructions being operable to retrieve a profile for an intended fiber, the profile including unique measurement data of the intended fiber, collect further measurement data from a connected fiber within a network, compare the unique measurement data of the intended fiber to the further measurement data of the connected fiber, and confirm an identity of the connected fiber as being the intended fiber when the unique measurement data matches the further measurement data, and trigger an alert when the unique measurement data does not match the further measurement data. | 06-23-2011 |
20120109570 | System and Method for Measuring Fiber Temperatures Using OTDR Measurements - Described herein are systems and methods for calculating a relative temperature of a fiber-optic cable using bi-directional analysis traces with an optical time-domain reflectometer (“OTDR”). Analysis of bi-directional traces along a length of fiber-optic cable yields a scaled local backscatter coefficient of the fiber. Accordingly, an initial set of measurement data is collected at a first time interval and a base scaled local backscatter along a fiber is calculated. A subsequent set of measurement data is collected at a second time interval and a subsequent scaled local backscatter along the fiber is calculated. The exemplary systems and methods described herein determines a change in scaled local backscatter as a function of a difference between the base scaled local backscatter and at least the subsequent scaled local scaled local backscatter along the fiber, and then determines a relative temperature variation of the fiber as a function of the change in scaled local backscatter. | 05-03-2012 |
20130077967 | Optical Networks Using Multi-spatial Mode Media - A fiber optic system includes a transmitter for transmitting high-speed streaming electrical data to a receiver for receiving the high-speed data. In order to transmit multiple channels in the system at high-speeds, an electrical data signal is converted into multiple optical sub-signals. Each of the multiple optical sub-signals are transmitted at the common wavelength on multi-spatial mode media. The receiver receives the multiple optical sub-signals as a multi-spatial mode optical signal and separates the multi-spatial mode optical signal into branch signals having a common wavelength. The receiver mixes each of the branch signals with optical carrier waves having the common wavelength and converts the branch signals into electrical signals. Digital signal processing is used to recover the data sub-signals which are used to recover the original data signal. | 03-28-2013 |
20140139824 | System and Method for Measuring Fiber Temperature Using OTDR Measurements - Systems and methods for calculating a relative temperature of a fiber-optic cable using bi-directional analysis traces with an optical time-domain reflectometer (“OTDR”). Analysis of bi-directional traces along a length of fiber-optic cable yields a scaled local backscatter coefficient of the fiber. Accordingly, an initial set of measurement data is collected at a first time interval and a base scaled local backscatter along a fiber is calculated. A subsequent set of measurement data is collected at a second time interval and a subsequent scaled local backscatter along the fiber is calculated. The exemplary systems and methods described herein determines a change in scaled local backscatter as a function of a difference between the base scaled local backscatter and at least the subsequent scaled local scaled local backscatter along the fiber, and then determines a relative temperature variation of the fiber as a function of the change in scaled local backscatter. | 05-22-2014 |
Patent application number | Description | Published |
20090067841 | FIBER AND WIRE COMMUNICATION SYSTEM - This invention provides a new architecture for a communication system between head-ends and end-users which expands bandwidth and reliability of the communication system. A mux-node receives communication signals from a head-end and forwards the received communication signals to one or more mini-fiber nodes. The connection to the head-end is via a small number of optical fibers and the connections to each of the mini-fiber nodes may be via one or more optical fibers that may provide full duplex communication. The head-end may communicate with the mux-node using digital or digital and analog signals. The mini-fiber nodes may combine the signals received from the head-end with loop-back signals used for local media access control prior to forwarding the signals to the end-users. Upstream data are received by the mini-fiber nodes and transmitted to the mux-node. The mux-node may route upstream communication signals received from the mini-fiber nodes as downstream signals to other mini-fiber nodes also connected to the mux-node without head-end interaction. | 03-12-2009 |
20090205007 | Fiber-optic access network utilizing CATV technology in an efficient manner - A system is provided for combining conventional HFC plants with fiber-optic access systems (e.g., fiber-to-the-home or fiber-to-the-curb) that share a head-end and other equipment. A robust modulation format, such as QPSK, having a sufficient SNR to transmit information (e.g., data, digital audio and digital video) downstream to users' premises via a fiber-optic access system is used. Also, a method and apparatus is provided for converting a first modulation format for information received via a fiber-optic access system to a modulation format compatible with customer premises equipment. | 08-13-2009 |
20090290543 | Transmit and Receive Method for a Data Service - A method includes receiving a plurality of radio frequency (RF) channels in parallel at a receive site, and demodulating the RF channels using a plurality of demodulators of the receive site to generate a plurality of streams of packets, each stream of packets having a first address space. The method also includes combining the plurality of streams of packets at a tunneling destination of the receive site to generate a first stream of packets having a second address space. | 11-26-2009 |
20100124391 | Growable multi-degree ROADM - A multi-degree expandable reconfigurable optical add drop multiplexer (ROADM) based on a wavelength-selective crossconnect (WSXC), and method for upgrading the same. The WSXC generally consists of an outer layer of optical fan-out devices, and an outer layer of optical fan-in devices. At least one inner layer of optical fan-out or fan-in devices, including at least one wavelength switch, is disposed between the outer layer of optical fan-out devices and the outer layer of optical fan-in devices in a cascaded arrangement relative to the outer layers. At least one output port of an optical fan-out device in the outer layer of optical fan-out devices is connected to an input port of an optical device in the at least one inner layer, and at least one output port of an optical device in the at least one inner layer is connected to an input port of an optical fan-in device in the outer layer of optical fan-in devices. | 05-20-2010 |
20100208751 | Method, System, and Device for Sending Data in a Cable Data Service - A method of sending data from a transmit site to a receive device includes dividing a first transmit data stream having a first bit rate into multiple data streams with each of the multiple data streams having a bit rate that is lower than the first bit rate. Each of the multiple data streams is transmitted over a cable network having multiple radio frequency channels. The multiple data streams are recombined at the receive device to provide a receive data stream having a bit rate equal to the first bit rate. A second transmit data stream is transmitted over one of the radio frequency channels to a legacy user connected to the one radio frequency channel between the transmit site and the receive device. | 08-19-2010 |
20100265942 | Receive Device for a Cable Data Service - A receive device includes a plurality of demodulators and a tunnel destination. The demodulators are configured to receive multiple data streams, each of the multiple data streams having a bit rate that is lower than a bit rate of a transmit data stream. The tunnel destination is configured to recombine the multiple data streams to provide a receive data stream having a bit rate equal to the bit rate of the transmit data stream. At least one of multiple radio frequency channels is connected to a legacy user between a transmit site and the receive device. | 10-21-2010 |
20110261737 | TRANSMIT AND RECEIVE METHOD FOR A DATA SERVICE - A method includes receiving, at a transmit site, a first stream of packets addressed to an end user device in a first address space. The first stream of packets is encapsulated to form a second stream of packets addressed in a second address space. A first packet of the second stream of packets is assigned to a first radio frequency channel of a plurality of radio frequency channels. A second packet of the second stream of packets is assigned to a second radio frequency channel of the plurality of radio frequency channels. The first packet is transmitted via the first radio frequency channel and, in parallel, the second packet is transmitted via the second radio frequency channel. | 10-27-2011 |
20140369353 | DATA SERVICE INCLUDING CHANNEL GROUP - A method at a cable modem termination system includes dividing a transmit stream into multiple data streams and transmitting the multiple data streams over multiple radio frequency channels of a group of channels. The group of channels supports traffic to a plurality of destinations. Each channel in the group of channels is a downstream channel. | 12-18-2014 |
Patent application number | Description | Published |
20090036077 | SYSTEMS AND METHODS FOR PHOTONICALLY ASSISTED RF FILTERING - Systems and methods for improved photonically-assisted RF filtering. Presently, processing of wide-band RF signals involves the use of multiple specialized equipment to isolate a region of interest from the spectrum. The present invention discloses the use of a modulation system to upconvert the RF signal onto the sideband of a light source such as a laser, an optical filter sub-system comprising a plurality of filtering units that function as combinations of IIR and FIR filters, and a resonant channelizing filter for noise reduction and rejection of undesired channels, and means for control and agility of a piecewise coherent optical filter. The resulting filtered RF signal may then be downconverted to the electrical domain for further signal processing. | 02-05-2009 |
20120282872 | DIRECTIONAL NOTCH FILTER FOR SIMULTANEOUS TRANSMIT AND RECEIVE OF WIDEBAND SIGNALS - A directional notch filter for simultaneous transmit and receive of wideband signals comprises an antenna, an antenna match, a receiver, a power combiner, a first directional coupler, a second directional coupler and a shaping filter accepting a signal and producing a compensation signal as a replica of an antenna reflection transfer function, wherein the first and second directional couplers produce signals and portions of signals received by the antenna and sent to the receiver via the power combiner. The receiver can produce a receiver signal and the first directional coupler can produce a first signal as a portion of an overall signal received by the antenna, the first signal comprising at least reflection of a signal from the power amplifier and the second directional coupler samples a small portion of the receiver signal, said second directional coupler producing a second signal. | 11-08-2012 |
20130087689 | System and Method for Nonlinear Optical Devices - Systems for enhancing the sensitivity of detecting an optical signal using nonlinear optics and method of performing the same. In one embodiment, a single-photon detection system includes an optical amplifier realized in a waveguide, and a photodetector coupled to an output of the optical amplifier. A light detection and ranging system includes the optical amplifier coupled to an optical source and one photodetector. In another embodiment, a photodetection system includes a plurality of optical frequency converters, coupled to an optical source, that sequentially convert a wavelength of photons of the optical source to a final wavelength, and a single-photon photodetector coupled to the optical frequency converters to detect single photons produced by the optical source. In another embodiment, an optical sensor includes an optical pump, and a transducer including an optical ring cavity coupled to the optical pump and configured to utilize optical four-wave mixing to detect an external stimulus. | 04-11-2013 |
20130087692 | System and Method for Nonlinear Optical Devices - Systems for enhancing the sensitivity of detecting an optical signal using nonlinear optics and method of performing the same. In one embodiment, a single-photon detection system includes an optical amplifier realized in a waveguide, and a photodetector coupled to an output of the optical amplifier. A light detection and ranging system includes the optical amplifier coupled to an optical source and one photodetector. In another embodiment, a photodetection system includes a plurality of optical frequency converters, coupled to an optical source, that sequentially convert a wavelength of photons of the optical source to a final wavelength, and a single-photon photodetector coupled to the optical frequency converters to detect single photons produced by the optical source. In another embodiment, an optical sensor includes an optical pump, and a transducer including an optical ring cavity coupled to the optical pump and configured to utilize optical four-wave mixing to detect an external stimulus. | 04-11-2013 |
20130087693 | System and Method for Nonlinear Optical Devices - Systems for enhancing the sensitivity of detecting an optical signal using nonlinear optics and method of performing the same. In one embodiment, a single-photon detection system includes an optical amplifier realized in a waveguide, and a photodetector coupled to an output of the optical amplifier. A light detection and ranging system includes the optical amplifier coupled to an optical source and one photodetector. In another embodiment, a photodetection system includes a plurality of optical frequency converters, coupled to an optical source, that sequentially convert a wavelength of photons of the optical source to a final wavelength, and a single-photon photodetector coupled to the optical frequency converters to detect single photons produced by the optical source. In another embodiment, an optical sensor includes an optical pump, and a transducer including an optical ring cavity coupled to the optical pump and configured to utilize optical four-wave mixing to detect an external stimulus. | 04-11-2013 |
20130089888 | System and Method for Nonlinear Optical Devices - Systems for enhancing the sensitivity of detecting an optical signal using nonlinear optics and method of performing the same. In one embodiment, a single-photon detection system includes an optical amplifier realized in a waveguide, and a photodetector coupled to an output of the optical amplifier. A light detection and ranging system includes the optical amplifier coupled to an optical source and one photodetector. In another embodiment, a photodetection system includes a plurality of optical frequency converters, coupled to an optical source, that sequentially convert a wavelength of photons of the optical source to a final wavelength, and a single-photon photodetector coupled to the optical frequency converters to detect single photons produced by the optical source. In another embodiment, an optical sensor includes an optical pump, and a transducer including an optical ring cavity coupled to the optical pump and configured to utilize optical four-wave mixing to detect an external stimulus. | 04-11-2013 |
Patent application number | Description | Published |
20100111545 | MULTISCALE SAMPLING FOR WIDE DYNAMIC RANGE ELECTRO-OPTIC RECEIVERS - A method for multiscale sampling for wide dynamic range electro-optic receivers is presented. The method comprises obtaining a signal, reproducing the signal into first and second signals, scaling one signal with respect to the other, modulating both signals with the same modulation function, and utilizing the resulting vector response function to invert the response of the link over a greater dynamic range than would otherwise be possible with a single instance of the modulated signal. The sealed modulation response may be obtained by splitting the signal into two polarizations and utilizing a modulator having different response for the two polarizations, or by utilizing two modulators. | 05-06-2010 |
20110234435 | SYSTEM AND METHOD FOR SELECTIVE WAVELENGTH INTERLEAVED FILTERED TECHNIQUE (SWIFT) ADC - A system and method for selective wavelength interleaved filtering technique for analog to digital conversion (ADC) comprises a remote aperture for analog input, a modulator operable to transform the analog input into an initial optical signal, a photonic front end having high resolution optical filters operable to filter the optical signal into multiple subsequent optical signals and supply local oscillators for downconversion into electrical signals, a segmented subsystem having a plurality of ADCs, each operable to receive and convert one subsequent optical signal of the optical signals, and a memory buffer and process subsystem operable to reconstruct the converted subsequent optical signals into a digital representation of the analog input by executing reconstruction algorithms. Provision is made for compensation of distortions arising in the electrical to optical to electrical conversion process. The optical filters can include a self-registered filter wherein individual passbands are intrinsically aligned to one another. | 09-29-2011 |
20120134307 | HIGH RATE RF LINK TECHNOLOGY - A high rate radio frequency (RF) link system and method for spatially multiplexing data transmission is presented. The system can comprise a common communications point characterized by a first collection of antennas having independent channels interconnected with a known latency connection to a central process location, such as with optical fiber; and a second similarly configured collective endpoint or set of endpoints wherein multi-path between the first collection and the second collection is negligible. Signal decorrelation between independent channels is achieved through a combination of spatial separation and signal processing. In one aspect, decorrelation is performed using near-maximum likelihood Multiple-Input Multiple-Output signal processing. | 05-31-2012 |
20120315049 | METHOD AND APPARATUS FOR OPTIMIZED ANALOG RF OPTICAL LINKS - A system and method for optimizing an optical RF photonic link system is presented. The system comprises a modulator subsystem in which nonlinear response is compensated by an envelope precompensation method and employs an optical filter to suppress optical carriers and extract modulated sidebands, an optical amplifier, and an array of photodetectors, each having a plurality of pairs of diodes. The modulator subsystem performs optical filtering on the signal, the signal is amplified by the optical amplifier and sent to the array of photodetectors. The optical amplifier can be an erbium doped fiber amplifier, or a phase sensitive amplifier. The optical power can be delivered to each diode of the array of photodetectors via a photonic integrated circuit. | 12-13-2012 |