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| Number | Title | Issue Date |
| 8160453 | Protection switching with transmitter compensation function A method of protection switching between first and second transceivers where dispersion compensation is effected electrically in the transmitters. The method includes detecting, at the second transceiver, a signal failure of a signal transmitted from the first trans... | 04/17/2012 |
| 8145064 | System and method for suppressing noise by frequency dither A system for suppressing noise by frequency dither includes a transmitter, receiver and a frequency dither circuit, as well as a cavity along a propagation path of the electromagnetic signal between the transmitter and the receiver. The transmitter is configured to ... | 03/27/2012 |
| 8112001 | Non-linearity compensation in an optical transmission A method of transmitting information over a non-linear optical channel includes the step (152) of generating an information-bearing signal, preferably an OFDM signal, which includes a plurality of closely-spaced sub-carriers in the frequency domain. A time-va... | 02/07/2012 |
| 8041228 | Fiber optical transmission system, transmitter and receiver for DQPSK modulated signals and method for stabilizing the same A transmitter (3) for generating a DQPSK-modulated optical signal, including: a splitter (7) for dividing an optical carrier signal into a first and second branch (8a, 8b), a first and second Mach-Zehnder interferometer (... | 10/18/2011 |
| 7945170 | Method and system for optical transmission signal level configuration The invention relates to an optical transmission system comprising transmitter and receiver devices and comprising automatic optical signal level configuration means which provide the same fixed output signal level for a received signal level range, and the system c... | 05/17/2011 |
| 7941055 | Method for upgrading network rate of passive optical network This invention provides a method for upgrading the network rate of a Passive Optical Network (PON), which mainly includes: upgrading the optical fiber line rate of the central office device, and adapting, by the network terminal device, the working rate of the upstr... | 05/10/2011 |
| 7877017 | Optical waveform measurement system and optical waveform measurement method In an optical waveform measurement system, a phase comparator compares phases between an electric signal output from a PD and an electric signal output from a mixer, and outputs a signal having an amplitude proportional to the phase difference of the two electric si... | 01/25/2011 |
| 7813648 | Method and apparatus for compensating for fiber nonlinearity in a transmission system A transmitter includes a frequency modulated laser. An optical spectrum reshaper (OSR) is positioned to receive the frequency modulated signal and has a transmission function effective to convert the frequency modulation to amplitude modulation. An optical fiber cha... | 10/12/2010 |
| 7756421 | Electrical domain compensation of non-linear effects in an optical communications system Nonlinearity-induced signal distortions are compensated by processing an input communications signal, in the electrical domain prior to Electrical-to-optical conversion and transmission through an optical link of a communications system. According to the invention, ... | 07/13/2010 |
| 7720390 | Optical node device, network control device, maintenance-staff device, optical network, and 3R relay implementation node decision method An economical optical network is constituted by effectively using network resources by using the minimum number of, or minimum capacity of 3R repeaters. 3R section information corresponding to topology information on the optical network to which an optical node devi... | 05/18/2010 |
| 7650078 | Frequency extracting apparatus and signal extracting system employing the same Provided are a frequency extracting apparatus and a signal extracting system employing the same. The signal extracting system can reduce the effect of an input signal pattern by extracting two frequency components and beating them to extract a desired clock signal, ... | 01/19/2010 |
| 7616900 | Optical signal degradation compensator By comprising a unit 2 making the adjustment related to degradation compensation of a plurality of signals with each wavelength made after multiplexing the signals, a unit 3 multiplexing the outputs of a plurality of units 2, a unit 4 com... | 11/10/2009 |
| 7599625 | Method of initializing optical communication links A method of initializing an optical communication link between nodes. Optical transmitters adapted to pre-compensate link impairments based upon an optical compensation parameters are utilized to establish an optical communications link. Pre-compensation parameter v... | 10/06/2009 |
| 7457547 | Optical calibration system and method In an optical system including an optical input port for projecting an input optical signal onto an optical phased matrix array, an optical phased matrix array including a plurality of individually addressable pixels thereon, each said pixel being drivable within a ... | 11/25/2008 |
| 7444082 | Polarisation mode dispersion compensator using a mean square error technique A method for the adaptive adjustment of a PMD compensator in optical fiber communication systems comprises the steps of taking the signal at the compensator output and extracting the components y1(t) and y2(t) on the two orthogonal polarization... | 10/28/2008 |
| 7440702 | Method for transmitting digital image signal, digital image transmitting device, digital image sending device and digital image receiver A multiplexer of a transmission section generates a clock signal by multiplying a reference clock signal of a digital image signal by a predetermined number ‘K’. A parallel digital image signal is converted into a serial digital signal on the basis of the clock ... | 10/21/2008 |
| 7437083 | Wavelength converter A wavelength converter for binary optical signals includes an interferometer structure (110) for generating an output signal by modulating a received local signal (LS) according to the modulation of a fUrther received first input signal (IS 1). When su... | 10/14/2008 |
| 7437068 | Optical communication link An optical communication link has a plurality of light emitting elements and a plurality of light receiving elements associated with the respective light emitting elements, and a plurality of optical fibers each for conveying an optical signal emitted from one light... | 10/14/2008 |
| 7437080 | Optical transmission system having optimized filter wavelength offsets An optical transmission system having optical transmit and receive filters having passbands adjusted or selected for opposite and equal wavelength offsets from the optical wavelength of a carrier or the channel center wavelength. ... | 10/14/2008 |
| 7424228 | High dynamic range radio frequency to optical link A communication system includes an optical transmitter which is differentially driven and an optical receiver that outputs a differential signal. The optical transmitter creates the differential drive signal from an input signal and delivers the differential drive s... | 09/09/2008 |
| 7421209 | Optical wavelength multiplexing FSK modulation method An optical wavelength multiplexing frequency shift keying modulation system. The system includes an optical wavelength multiplexing signal acquisition unit for outputting an optical wavelength multiplexing signal. A n optical frequency shift keying modulation unit a... | 09/02/2008 |
| 7418212 | Electrical detection of optical symbols A system and method for detecting digital symbols carried in a received optical signal. The system comprises a functional element operative to receive a stream of samples of an electrical signal derived from the received optical signal and to evaluate a non-linear f... | 08/26/2008 |
| 7418206 | Control method of wavelength dispersion compensator, and wavelength dispersion compensator It is an object of the present invention to provide a control technique for reducing wavelength dependence of wavelength dispersion values and also for suppressing a change in wavelength transmission characteristic with a temperature variation or the like, in a VIPA... | 08/26/2008 |
| 7412170 | Broad temperature WDM transmitters and receivers for coarse wavelength division multiplexed (CWDM) fiber communication systems A wavelength division multiplexing (WDM) module for transmitting and/or receiving multiple signals simultaneously includes an array of vertical cavity surface emitting lasers (VCSELs) and/or photodetectors, respectively. In the transmitter case, different VCSELs are... | 08/12/2008 |
| 7406265 | Fiber optic communication signal link apparatus A fiber optic communication signal link apparatus for performing fiber optic link communication including a transmitter apparatus and a receiver apparatus coupled by a fiber optic cable. The transmitter is capable of detecting and modulating data that includes at le... | 07/29/2008 |
| 7403717 | Method and apparatus for first-order polarization mode dispersion compensation Method and apparatus for compensating for first-order Polarization Mode Dispersion in an optical transmission system. An apparatus has a polarization controller for transforming polarization components of an optical signal carried by the optical fiber into orthogona... | 07/22/2008 |
| 7400829 | Transmission apparatus and path selection method of a transmission apparatus A transmission apparatus that receives an optical signal by selecting any one of a plurality of provided optical signal transmission paths through protection control is configured to include a plurality of optical signal outputting sections that output the optical s... | 07/15/2008 |
| 7398022 | Optical return-to-zero phase-shift keying with improved transmitters An apparatus and a method for transmitting at least a digital optical signal with return-to-zero phase-shift keying, employing a single optical modulator with dual-drive design, the encoded optical signal having improved spectral efficiency and performances and bein... | 07/08/2008 |
| 7394986 | Flat top optical filtering component The invention relates to wavelength-selective optical filters for allowing light of a narrow optical spectral band, centered around a wavelength (λc) to pass through them, while reflecting the wavelengths lying outside this band. According to the inventi... | 07/01/2008 |
| 7394989 | Signal transmission device A transmission unit of a signal transmission device includes: a transmission-side detection unit that detects image information from an inputted electrical signal; a receiving unit that receives, from a reception unit, a status signal representing an arrival status ... | 07/01/2008 |
| 7394995 | System and method for a compact optical receiver with wide dynamic range An optical receiver is disclosed comprising an erbium-doped fiber amplifier (EDFA) that is coupled to a photodiode and transimpedance amplifier without filtering output light signal in the EDFA. Optionally, a clock/data regenerator can be coupled to the electrical o... | 07/01/2008 |
| 7389047 | Optical ring transmission network The network comprises an optical ring link (F) and a concentrator (HUB) that sends via one end of the link “downlink” optical signals carried by respective wavelengths and receives “uplink” optical signals via the other end of the link. The link is divided i... | 06/17/2008 |
| 7379677 | Method of wavelength conversion and wavelength converter The wavelength converter comprises (1) an optical multiplexer for multiplexing an amplitude-modulated first light and reference light, which is continuous light having a wavelength different from the wavelength of the first light, (2) an optical fiber for propagatin... | 05/27/2008 |
| 7376358 | Location specific optical monitoring An optical spike is generated at an arbitrarily selected location within an arbitrary optical link. The optical spike is generated by deriving a spike signal having a plurality of components, and launching the spike signal into the a transmitter end of the optical l... | 05/20/2008 |
| 7373087 | Adaptive optical transponder Systems and methods for optical communications. In one implementation, a communications device is provided. The communications device includes an Optical domain Adaptive Dispersion Compensation Module (OADCM); an Electrical domain Adaptive Distortion Compensation Mo... | 05/13/2008 |
| 7373091 | Multicasting optical switch fabric and method of detection based on novel heterodyne receiver The inventors propose herein a switch fabric architecture that allows broadcasting and fast channel access in the ns-range. In various embodiments of the present invention, 10 Gb/s receiver modules are based on a novel heterodyne receiver and detection technique, wh... | 05/13/2008 |
| 7369777 | Method and apparatus for automatically adjusting the optical power directed to a dispersion compensating element A dispersion compensator is provided that includes an input port 102 for receiving a WDM optical signal and a dispersion compensating element 110 coupled to the input port for substantially compensating the WDM optical signal for dispersion that has ac... | 05/06/2008 |
| 7366416 | Hub for a passive optical network hub A hub for use in a passive optical network (PON) includes a transmission fiber on which an information-bearing optical signal is received, a double-cladded, rare-earth doped fiber located along the transmission fiber for imparting gain to the information-bearing opt... | 04/29/2008 |
| 7362931 | Optical conversion device for shared FTTH distribution network An optical conversion device for a shared FTTH distribution network including first and second optical fibers and an optical processing circuit. The optical processing circuit has an input for receiving a first optical analog signal carried by the first optical fibe... | 04/22/2008 |
| 7357521 | Chromatic dispersion compensation device and method A chromatic dispersion compensator whereby the amount of dispersion and the group delay time can be easily adjusted. A dispersion unit, a transmitting lens and a group delay generation unit are arranged along the optical axis of incident light. The dispersion unit s... | 04/15/2008 |
