Entries |
Document | Title | Date |
20080232804 | PON WITH PROTECTED CROSS-CONNECT FORWARDING - Redundancy is provided in a passive optical network (PON) to protect against network malfunctions or provide other benefits. The Optical Line Terminal (OLT) that couples an external network to the PON routes network traffic via one or, alternatively, both of two paths or links between the OLT and a subscriber device. The subscriber device is coupled to two Optical Network Terminators (ONTs), each of which, along with a portion of the fiber network, forms part of one of the links. | 09-25-2008 |
20080279555 | Method to Provide Caller's Location in IP Phone System, Optical Transmission System, Optical Connector, and Optical Network Unit - To inform a location of a caller to the other party in an IP phone system, a wireless IC tag preserving unique ID information is attached to an optical connector of a user connection port. The relations between locations of the optical connectors and ID information of corresponding wireless IC tags are stored in a port control database. An IC tag reader in an optical network unit (ONU) reads the ID information in the wireless IC tag attached to the optical connector to which the ONU is connected. When an emergency call is initiated, the ONU transmits destination information of the emergency call and the ID information of the wireless IC tag to a central station. A control terminal in the central station compares the ID information of the wireless IC tag against the port control database to determine a location of the optical connector. The central station adds the determined location information to the destination information of the emergency call and transmits the information to an IP network. | 11-13-2008 |
20080317469 | PASSIVE OPTICAL NETWORK SYSTEM AND RANGING SYSTEM THEREOF - A station-side communication device connected to subscriber-side communication devices via an optical combining device; sending, to the subscriber-side communication devices, a distance measurement request signal; computing transmission delay times of optical signals from the individual subscriber-side communication devices by receiving distance measurement signals, and including: a threshold control part identifying the level of distance measurement signals; a signal detection part detecting breaks in the distance measurement signals from the threshold control part; a transmission granting part determining the timing at which transmission of optical signals is granted, and a reset timing generation part that, there is notification of detection of a break in the distance measurement signal from the signal detection part while it is being notified that distance measurement is carried out to and from the subscriber-side communication devices from the transmission granting part, sends a reset signal indicating that the voltage level is reset to the threshold control part. | 12-25-2008 |
20090041461 | ONU MANAGEMENT METHOD AND OPTICAL LINE TERMINATION - In a PON system, a PON-ID assigned to a connected ONU before replacement is assigned to a newly connected ONU after the replacement and, setting data before the replacement is succeeded also after the replacement. An OLT includes a PON-ID state where a management state of the PON-ID is stored, a PON-ID management table where the PON-ID and an ONU serial number of the connected ONU and setting data are correspondingly stored and, a delete ONU table where the PON-ID and an ONU serial number of a replacement object are correspondingly stored. When the OLT receives an ONU replacement instruction from an operation system, the PON-ID assigned to the ONU of the replacement object is assigned to an ONU newly connected during the ONU replacement. | 02-12-2009 |
20090047020 | ONU MANAGEMENT METHOD AND OPTICAL LINE TERMINATION - In a PON system, a PON-ID assigned to a connected ONU before replacement is assigned to a newly connected ONU after the replacement and, setting data before the replacement is succeeded also after the replacement. An OLT includes a PON-ID state where a management state of the PON-ID is stored, a PON-ID management table where the PON-ID and an ONU serial number of the connected ONU and setting data are correspondingly stored and, a delete ONU table where the PON-ID and an ONU serial number of a replacement object are correspondingly stored. When the OLT receives an ONU replacement instruction from an operation system, the PON-ID assigned to the ONU of the replacement object is assigned to an ONU newly connected during the ONU replacement. | 02-19-2009 |
20090052897 | PASSIVE OPTICAL NETWORK SYSTEM AND RANGING SYSTEM THEREOF - A station-side communication device connected to subscriber-side communication devices via an optical combining device; sending, to the subscriber-side communication devices, a distance measurement request signal; computing transmission delay times of optical signals from the individual subscriber-side communication devices by receiving distance measurement signals, and including: a threshold control part identifying the level of distance measurement signals; a signal detection part detecting breaks in the distance measurement signals from the threshold control part; a transmission granting part determining the timing at which transmission of optical signals is granted, and a reset timing generation part that, there is notification of detection of a break in the distance measurement signal from the signal detection part while it is being notified that distance measurement is carried out to and from the subscriber-side communication devices from the transmission granting part, sends a reset signal indicating that the voltage level is reset to the threshold control part. | 02-26-2009 |
20090110400 | WDM TYPE PASSIVE OPTICAL NETWORK - In a WDM type PON system, each ONU comprises an optical transmitter capable to transmit optical signals with variable wavelengths, an optical signal receiving filter variable its receiving wavelength, and a control unit. An OLT selects in response to a wavelength allocation request from each ONU, a transmitting wavelength and a receiving wavelength out of currently free wavelengths and allocates these wavelengths to the requester ONT. The control unit of the ONU switches the transmitting wavelength of the optical transmitter and the receiving wavelength of the optical signal receiving filter to the wavelengths specified in a response message from the OLT and starts data communication. | 04-30-2009 |
20100040372 | WIRELESS OVER PON - A system for communicating wireless signals includes a passive optical network (PON) between a central office (CO) and network subscribers. The CO has an optical line terminal (OLT) and a wireless base station. An RF/Optic converter converts base station radio frequency (RF) signals to and from corresponding optical signals. An optical combiner combines signals of the OLT and signals of the RF/Optic converter for communication over the PON with at least one optical network unit (ONU) at a location of one or more of the network subscribers, so that signals of the OLT and converted wireless base station signals are carried together over the PON. A fiber mounted wireless antenna unit (FMCA) having an optical interface and a wireless antenna, and communicating wireless signals of the wireless antenna with the ONU, including performing conversions between wireless RF signals and optical signals. | 02-18-2010 |
20100061729 | Method and system for optical transmission - A system and method for optical transmission that provides an efficient manner of increasing transmission capacity, especially in the downstream direction, with minimal changes to existing components. An optical network node includes an optical transmitter, a plurality of optical media access controllers, and a bit interleaver for interleaving the output of each of the plurality of optical media access controllers into a single bit stream and providing the bit stream to the optical transmitter. In operation, the optical network node, which may be an OLT, thereby is capable of transmitting at a rate equal to the sum of the output rates of the individual media access controllers. A corresponding deinterleaver in a receiving node, such as an ONT, separates the interleaved bit stream into its constituent bit streams, one or more of which may be selected for use in the receiving device. | 03-11-2010 |
20100086304 | OPTICAL COMMUNICATION SYSTEM - A transmitting apparatus includes a plurality of code spreaders different in spreading code, a reception processing unit that selectively distributes transmission data to the plurality of code spreaders, a plurality of optical transmitters each of which that transmit a code-spread signal to an optical fiber as a CDMA optical signal of a carrier wavelength different from that of the other optical transmitters, and a signal multiplexing unit that selectively supplies outputs of the plurality of code spreaders to the plurality of optical transmitters, and a receiving apparatus includes an optical receiver that receives a wavelength-division-multiplexed CDMA optical signal from the optical fiber, and a plurality of despreaders connected to the optical receiver and different in spreading code, wherein each of the despreaders reproduces a CDMA signal corresponding to its spreading code from an output signal of the optical receiver. | 04-08-2010 |
20100158525 | MODULAR NETWORK TERMINALS AND METHODS TO USE THE SAME - Example modular optical network terminals (ONTs) and methods to implement the same are disclosed. A disclosed example ONT includes a base unit having an integral optical interface to optically couple the ONT to an optical network, and to convert an optical signal received from the optical network to form an electrical signal, a plug-in service module to distribute the electrical signal within a customer premises, and a modular interface connector configured to receive the plug-in service module and to couple the electrical signal from the base unit to the plug-in service module. | 06-24-2010 |
20110097086 | Optical Broadcast Systems And Methods - Embodiments of the present invention are directed to optical broadcast systems ( | 04-28-2011 |
20130016972 | LASER MUX ASSEMBLY FOR PROVIDING A SELECTED WAVELENGTH - A laser mux assembly generally includes a back reflector selectively coupled to one of the input ports of an optical multiplexer, such as an arrayed waveguide grating (AWG), and at least one laser emitter coupled to an output port. The laser emitter may include a gain region that emits light across a plurality of wavelengths including, for example, channel wavelengths in an optical communication system. The emitted light is coupled into the output port and the AWG or optical multiplexer filters the emitted light from the laser emitter at different channel wavelengths. The back reflector reflects the filtered light at the respective channel wavelength such that lasing occurs at the channel wavelength(s) of the reflected, filtered light. The laser mux assembly may be used, for example, in a tunable transmitter, to generate an optical signal at a selected channel wavelength. | 01-17-2013 |
20130272708 | SUBSCRIBER-SIDE OPTICAL COMMUNICATION DEVICE, COMMUNICATION SYSTEM, CONTROL DEVICE, AND POWER-SAVING CONTROL METHOD - An ONU includes a CDR that regenerates a clock based on a signal from an OLT, an oscillator that generates an internal clock, a time stamp counter that manages a time of the ONU based on the clock in a period in which the CDR regenerates the clock and manages the time of the ONU based on the internal clock in a period in which the CDR does not regenerate the clock, an MPCP control unit that decides, when a Cyclic Sleep mode is set, a receiver-time synchronization time that is a period in which the receiver is normally operated within a sleep time, based on a difference between a time stamp value included in the signal transmitted from the OLT and a time stamp managed by the time stamp counter, and a power-saving control unit that controls the receiver to be normally operated in the receiver-time synchronization time. | 10-17-2013 |
20140064731 | FIBER OPTIC TERMINALS, SYSTEMS, AND METHODS FOR NETWORK SERVICE MANAGEMENT - Fiber optic terminals, systems, and methods for providing differentiated network services to subscribers of a fiber optic network are disclosed. In certain embodiments, fiber optic terminals and methods are disclosed for providing more than one network service to subscribers supported by the same fiber optic terminal. In one embodiment, a fiber optic terminal is provided comprising a first optical path connected to a first network-side optical fiber providing a first network service to a first subscriber-side optical fiber. The fiber optic terminal also comprises a second optical path connected to a second network-side optical fiber providing a second network service differentiated from the first network service to a second subscriber-side optical fiber. In this manner, differentiated network services can be provided to subscribers supported by the fiber optic terminal by configuring connections of the subscribers to either the first optical path or second optical path in the fiber optic terminal. | 03-06-2014 |
20150023665 | DYNAMIC CONTROL OF OPTICAL ATTENUATORS TO ENABLE IP MULTICAST - Methods and systems for distributing multicast signals carried by an incoming light wave are disclosed. According to one aspect, the invention provides a method of controlling an optical device. The method includes dynamically controlling a plurality of optical attenuators of the optical device based on control signals indicative of changes to a multicast group. | 01-22-2015 |
20150304039 | SYSTEMS AND METHODS FOR CLIP PREVENTION IN A CATV NETWORK - Systems and methods for preventing laser clipping in a CATV network. | 10-22-2015 |
20160204872 | METHOD AND APPARATUS FOR GENERATING OPTICAL POLAR RETURN-to-ZERO AMPLITUDE MODULATION SIGNAL USING REFLECTIVE SEMICONDUCTOR OPTICAL AMPLIFIER AND WAVELENGTH-DIVISION-MULTIPLEXED PASSIVE OPTICAL NETWORK SYSTEM USING THE SAME | 07-14-2016 |