Optical communications inventions 10/09

20090245781 - Apparatus and method for detecting timeslot conflict between optical network units in optical communication network: The objective of the present invention is to provide a solution for detecting timeslot conflict between Optical Network Units (ONUs) in an Optical Line Terminal (OLT). When all ONUs are deactivated and there is still any light signal in the upstream, each ONU is notified to switch off the power... Agent: Harness, Dickey & Pierce, P.L.C

20090245782 - Network connection device and signal processing method in the network connection device: A network connection device for performing a process of transmitting and receiving a SONET/SDH frame includes a first protocol processor which processes a first network management protocol; a second protocol processor which processes a second network management protocol; a frame header extractor which extracts a header from the received SONET/SDH... Agent: Staas & Halsey LLP

20090245783 - Method and system for providing fault recovery using composite transport groups: An approach is provided for performing fault recovery using composite transport groups (CTGs). A first logical channel is established within a composite transport group, wherein the first logical channel is established over a first link associated with a first service provider to a customer premise equipment (CPE) node configured to... Agent: Verizon Patent Management Group

20090245784 - Centralized congestion avoidance in a passive optical network: In one aspect, a method for congestion avoidance in a passive optical network having an optical line terminal communicatively connected to a plurality of optical network termination devices is provided. A dynamic bandwidth allocation information is periodically requested from the optical network termination device and the optical line terminator receives... Agent: Lerner Greenberg Stemer LLP

20090245785 - Optical receiver: An optical receiver in which a failure in a certain channel affects no other channels is provided. An optical receiver inputs DQPSK optical signals supplied from the outside into each of first and second delay interferometers and reproduces optical output from the first and second delay interferometers as binary non-return-to-zero... Agent: Sughrue Mion, Pllc

20090245786 - Optical communication system, method of measuring optical transmission line in the optical communication system, transmitting station, and receiving station: According to halt of a Raman pumping light source, a transmitting light power of a first light which is subject to receive a Raman gain is controlled to increase. In this state, a first input/output light power for a first light of an optical transmission line is measured, the first... Agent: Fujitsu Patent Center C/o Cpa Global

20090245787 - Characterization and control of optical dispersion compensating element: An apparatus and method are applied to characterizing an dispersion-affecting element for use in controlling chromatic dispersion in an optical communications link. Information regarding the behavior of the dispersion-affecting element is recorded and stored in a medium that is provided for deployment with the dispersion-affecting element to enable improved management... Agent: Verizon Patent Management Group

20090245788 - Integrated optical communication and range finding system and application thereof: The present invention is directed toward systems for conducting laser range and enabling optical communication between a plurality of entities and to the application of such systems in a secure covert combat identification system. In one embodiment, the present invention uses a novel laser system that generates high pulse rates,... Agent: Townsend And Townsend And Crew, LLP

20090245789 - Methods 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... Agent: Ryan, Mason & Lewis, LLP

20090245790 - Passive optical network system and operation method of the same: In a passive optical network system, in order that by measuring a transmission distance and a transmission time between an OLT and an ONU in operation of the system, if the distance or the time is short, communication is conducted at a high transmission speed to increase a capacity of... Agent: Antonelli, Terry, Stout & Kraus, LLP

20090245791 - Method and system for fibre channel and ethernet interworking: Certain aspects of a method and system for Fibre Channel and Ethernet interworking may include receiving by a central processing unit (CPU), one or more requests for discovery of one or more Fibre Channel (FC) switches based on a Fibre Channel initialization protocol (FIP). The CPU may be operable to... Agent: Mcandrews Held & Malloy, Ltd

20090245792 - Network systems and communications equipment: A duplicate system includes an active side (0 side) and a standby side (1 side). An OLT includes an autodiscovery function which, when the OLT is active, determines the next starting time of autodiscovery procedure of the standby side and notifies the standby side of the above starting time, a... Agent: Mattingly & Malur, P.c.

20090245797 - Communication system and apparatus: A communication system includes a first communication apparatus included in an initial station, the first communication apparatus transmitting a signal to the intermediate station on a later stage, the first communication apparatus receiving a signal sent from the terminal station and passed through the intermediate station, a second communication apparatus... Agent: Staas & Halsey LLP

20090245794 - Controllable optical multiplexer: An inventive controllable optical multiplexer for control of multiplexing channels in a fiber-optic communication system provided with 2N of wavelength-division multiplexing channels, whose optical frequencies are re-tunable at a constant wavelength shifting between adjacent channels, comprises a multi-stage structure of optical filters provided with elements for controllable re-tuning transmission coefficients.... Agent: Aleksandr Smushkovich

20090245795 - High capacity transmitter implemented on a photonic integrated circuit: A high capacity optical transmitter implemented on a photonic integrated circuit chip comprises a single light source which supplies a continuous wave having a particular wavelength to a plurality of modulators to form modulated optical information signals. A phase shifter is coupled to at least one of the modulators and... Agent: Infinera Corporation

20090245793 - Mapping a client signal into transport frames: Embodiments of the present invention provide a systems, devices, and methods in which a client signal is divided into a plurality of channels, mapped within transport frames, and combined into a WDM transport signal. These embodiments include intra-nodal redundancy that protects against failure events within the transport transmitter. In particular,... Agent: Infinera Corporation

20090245798 - Optical circuit and receiver circuit: An optical circuit that converts a phase-modulated optical signal into intensity-modulated signal light in accordance with a phase, the optical circuit including a square mode distribution forming portion that forms a plurality of interfering signals each assuming a square mode shape, the interfering signals having respective phases shifted from each... Agent: Staas & Halsey LLP

20090245800 - Optical module implemented with tri-plexer optical subassembly: An optical module that implements with a tri-plexer assembly is disclosed. The tri-plexer module comprises a bi-directional module for transmitting digital input and output signals and an analogue optical assembly for receiving analog optical signals. The bi-directional module installs both a light-emitting device and a light-receiving device in a signal... Agent: Venable LLP

20090245796 - Optical receiver including a filter on a planar lightwave circuit: A planar lightwave circuit (PLC) includes a substrate, a tunable filter, a demultiplexer (DEMUX), and an optical processor each disposed on the substrate. The tunable filter is configured to filter at least one of a bandwidth or a wavelength of a Wavelength Division Multiplexed (WDM) optical input signal. The DEMUX... Agent: Infinera Corporation

20090245799 - Protected light source for multiple wavelength division multiplexed passive optical networks (wdm-pons): A protected light source for generating seed light for at least two wavelength division multiplexed passive optical networks (WDM-PONs). The protected light source includes an optical coupler having N≧2 input ports and M≧2 output ports, each output port being optically connected to supply seed light to a respective set of... Agent: Blake, Cassels & Graydon, LLP

20090245801 - Receiver on a photonic ic: An optical receiver includes a first substrate including a demultiplexer and a first optical waveguide array. An input of the demultiplexer is configured to receive a wavelength division multiplexed optical input signal having a plurality of channels. Each of the plurality of channels corresponds to one of a plurality of... Agent: Infinera Corporation

20090245802 - System and method for dual wavelength communications of a clock signal: A system and method for synchronizing a clock signal. Data traffic is received through a first channel of a fiber optic. A clock signal is received through a second channel of the fiber optic. A clock at a node is disciplined with the clock signal. The clock signal is sent... Agent: Sonnenschein Nath & Rosenthal LLP

20090245804 - System and method for improved infrared communication between consumer appliances: Optical or electrical attenuation is provided at the infrared (IR) receiver of a first device, such as a remote control, together with a commensurate increase in output of the IR transmitter of an appliance, such as a set top box, to improve the signal-to-noise ratio of IR communications with respect... Agent: Greenberg Traurig, LLP

20090245803 - System and method for reduction of infrared noise during communication between consumer appliances: A system and method for facilitating infrared (IR) communications from a first device, such as a set top box, to a second device, such as a remote control, in the presence of an IR noise generating device, such as a plasma television, by using at least one of the first... Agent: Greenberg Traurig, LLP

20090245805 - System and method for communicating wireless data utilizing a passive optical network: In one embodiment, a method for providing wireless communications utilizing a passive optical network (PON) is disclosed. The method includes receiving, at a PON, downstream packets from a base station destined for a mobile station, and transmitting the downstream packets to wireless transceivers associated with PON. The method also includes... Agent: Baker Botts L.l.p.

20090245806 - Visible light communication apparatus: A visible light communication apparatus is constituted with a transmitter for illuminating and projecting visible light on which an information signal is superimposed from a lamp fitting and a receiver for receiving the visible light to take out the information signal superimposed on the visible light. The transmitter modulates a... Agent: Westerman, Hattori, Daniels & Adrian, LLP

20090245807 - Optical power monitoring circuit, optical transceiver, optical module, optical receiver, amplifier circuit, and integrated circuit: Optical power monitoring capable of achieving a wide dynamic range and high-speed response is realized. An optical power monitoring circuit includes: a first amplifier (TIA 2) that amplifies an input current from a light-receiving element (PD 1) with a variable gain to convert the current into a voltage signal; a... Agent: Nec Corporation Of America

20090245808 - Method and system for inter-chip communication via integrated circuit package waveguides: Methods and systems for inter-chip communication via integrated circuit package waveguides are disclosed and may include communicating one or more signals between or among a plurality of integrated circuits via one or more waveguides integrated in a multi-layer package. The integrated circuits may be bonded to the multi-layer package. The... Agent: Mcandrews Held & Malloy, Ltd

20090245809 - Optical transmission system: An optical transmission system capable of efficiently reducing waveform distortion of an optical signal. A transmitting-side distortion compensation coefficient storage of a transmitting station stores transmitting-side distortion compensation coefficients for compensating for waveform distortion of an optical signal to be transmitted to a receiving station. A transmit signal processor performs... Agent: Staas & Halsey LLP

20090245810 - Dynamic signal equalization in optical transmission systems: In an optical transmission system, data is transmitted via an optical beam modulated with an arbitrary waveform. The optical beam is transmitted through at least one optical element. Transmission through at least one optical element degrades the signal quality of the initial optical beam. The signal characteristics of at least... Agent: Nec Laboratories America, Inc.

20090245811 - High bandwidth communication system and method: A communication system (20) includes a transmitter (22) with (i) a transmitter photonic crystal (30) having a waveguide (40) and multiple cavities (42, 44, and 46) spaced along the waveguide (40); (ii) a light source (32); and (iii) a controller (34) that controls the cavities (42, 44, and 46) to... Agent: Christopher B. Jacobs, Esq. Renner, Otto, Boisselle & Sklar, LLP

20090245812 - Optical transmission circuit: Provided is an optical transmission circuit capable of realizing a high-quality optical signal waveform with low power consumption. An optical transmission circuit (10) includes: a laser diode (800); a modulator (900) for supplying a differential modulation current to an anode terminal and a cathode terminal of the laser diode (800)... Agent: Antonelli, Terry, Stout & Kraus, LLP

20090245813 - Modulator driver with multi-channel active alignment: Modulator driver for driving an electro-optical modulator in a high-speed optical communications system. In accordance with aspects of the present invention, a modulator driver is presented comprising an active signal splitter providing a first pair and a second pair of differential output signals, each pair of differential output signals input... Agent: Kitel Technologies Llc

20090245814 - Optical communications: A method of transmitting a plurality n data streams comprises modulating an optical carrier using differential M-ary phase shift key (DMPSK) signalling in which M=2n. Advantageously the method comprises using differential quaternary phase shift keying in which n=2. A particular advantage of the method of the present invention is that... Agent: Lahive & Cockfield, LLP Floor 30, Suite 3000

20090245815 - Apparatus and method for frequency offset monitoring used in digital coherent optical receiver: The present invention discloses a frequency offset detecting apparatus and method for use in a digital coherent optical receiver. The digital coherent optical receiver comprises: a front-end processing section for generating a digital baseband electric signal; an equalizer for performing equalized filtering on the digital baseband electric signal; and the... Agent: Staas & Halsey LLP

20090245816 - Filter coefficient changing apparatus and method: The present invention discloses filter coefficient changing apparatus and method for use in a dual-polarized optical coherent receiver. The apparatus comprises a controlling unit, a switching unit and a new coefficient obtaining unit. The switching unit is connected between a first filter coefficient updating unit and a first filtering unit... Agent: Staas & Halsey LLP