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| Number | Title | Issue Date |
| 8121481 | Chromatic dispersion compensation designing method in optical network and a system thereof A residual chromatic dispersion target value at a terminal node is set for each wavelength path, and also, candidates of a dispersion compensation amount settable in each chromatic dispersion compensation module on an optical network are set, and further, computatio... | 02/21/2012 |
| 8111993 | Methods and apparatus for optical transmission of digital signals A system (100) for transmitting digital information includes a transmitting apparatus (102) for generating an optical signal bearing digital information, a dispersive optical channel (104), and a receiving apparatus (110) for receiving th... | 02/07/2012 |
| 8107817 | Method for receiving optical orthogonal frequency-division multiplexing signal and receiver thereof A method for receiving an optical orthogonal frequency-division multiplexing (OFDM) signal and a receiver thereof are applicable to an optical OFDM system. The receiving method includes the following steps. An optical signal is converted into a digital signal. A sym... | 01/31/2012 |
| 8068736 | Tunable dispersion compensator The tunable dispersion compensator 10 of the present invention comprises: the Mach-Zehnder interferometers (MZIs) 21 to 25 cascaded on a planar lightwave circuit; and the tunable couplers 31 to 34 connected to between each correspo... | 11/29/2011 |
| 8055135 | Dispersion compensator, and dispersion compensating method A dispersion compensator (10) that compensates dispersion occurring in an optical pulse includes a spatial filter (100) from which a pulsed light having a single peak is emitted as an autocorrelation light when a light having a strong correlation with ... | 11/08/2011 |
| 7983564 | Transmission system and transmission method A wavelength division multiplexing system according to the present art adjusts the amount of dispersion compensation (the amount of dispersion compensation of an NZ-DSF and a DCF) every all spans on the basis of the time slot when an intensity modulation signal tran... | 07/19/2011 |
| 7949257 | System and method for tunable chromatic dispersion compensation One embodiment sets forth a technique for measuring chromatic dispersion using reference signals within the operational range of amplifiers used to refresh data signals. One red/blue laser pair in the transmission node is used for measuring dispersion and chromatic ... | 05/24/2011 |
| 7936993 | Chromatic dispersion compensating apparatus In order to compensate for chromatic dispersion ad dispersion slope over an entire wavelength band of the optical signal, the wavelength band is split into a plurality of bands, and chromatic dispersion compensation is made to make chromatic dispersion in a central ... | 05/03/2011 |
| 7885545 | Dispersion compensation method and compensation node A dispersion compensation method comprising the steps of: a) providing a compensation node for each predetermined number of in-line repeaters; b) carrying out dispersion compensation for the in-line repeaters with the different bit rates in common; c) carrying out w... | 02/08/2011 |
| 7865082 | Optical receiver and controlling method thereof, and optical transmission system The optical transmitter and receiver of the invention includes: a variable dispersion compensator that performs wavelength dispersion compensation on an optical signal of a differential M-phase modulation format input from a transmission path; an optical amplifier t... | 01/04/2011 |
| 7809271 | End-to-end chromatic dispersion characterization of optically amplified link An economic way of determining the chromatic dispersion along a link of a DWDM network is provided. A transmitter modulates the output signals of two lasers operating at two different wavelengths and the modulated output signals are sent into the link. Detectors at ... | 10/05/2010 |
| 7801444 | Amplification for optical fibre ultrawide band transmission systems The invention relates to a very broad band wavelength multiplexed transmission system, typically having a bandwidth greater than 150 nm or 200 nm, and in which energy transfers between channels caused by the Raman effect are compensated. The depletion of channels at... | 09/21/2010 |
| 7783197 | Method and apparatus for reducing crosstalk in a DWDM transmission system A method and apparatus is provided for transmitting a WDM optical signal. The method begins by modulating a plurality of optical channels that are each located at a different wavelength from one another with a respective one of a plurality of information-bearing ele... | 08/24/2010 |
| 7751713 | Communication network with skew path monitoring and adjustment Embodiments of the present invention route a WDM signal across multiple communication paths using skew characteristics of at least some of the communication paths. The network is an optical transport network, using either circuit or packet based switching, and wavel... | 07/06/2010 |
| 7725032 | Optical transmission apparatus An optical transmission apparatus includes an optical add drop multiplexer (OADM) that adds/drops an optical signal to/from a transmission path. The optical transmission apparatus further includes a pump light multiplexer and a dispersion compensation fiber that are... | 05/25/2010 |
| 7702241 | Optical signal regenerator and transmission system A regenerator (7.x, 7.1-7.3) for regenerating optical signals on optical transmission links (4), in particular for use in a Dense Wavelength Division Multiplex (DWDM) optical transmission system. The regenerator (7.x, | 04/20/2010 |
| 7689125 | Methods and systems for polarization control and polarization mode dispersion compensation for wideband optical signals An optical processing method includes: receiving an optical signal from an optical system, wherein the optical signal is distorted by frequency-dependent polarization effects in the optical system; spatially dispersing frequency components of the distorted optical s... | 03/30/2010 |
| 7689126 | Wavelength dispersion compensation control method and wavelength dispersion compensation control device A wavelength dispersion compensation control method determining whether a clock component is contained in an optical signal received from an optical transmission path and, if a clock component if contained in the optical signal, extracting the clock component, and s... | 03/30/2010 |
| 7653310 | Wavelength division multiplex (WDM) transmission system A low-cost configuration of, and at the same time to control the variable dispersion compensator at a high speed in a variable dispersion compensator for compensating the wavelength dependent accumulated dispersion resulting from the wavelength dependency of the tra... | 01/26/2010 |
| 7616894 | System and method for mitigating dispersion slope in an optical communication system A system and method for mitigating dispersion slope is capable of reducing the performance impact on an optical communication system caused by dispersion slope. The system and method receives an optical signal, demultiplexes the optical signal and optically filters ... | 11/10/2009 |
| 7616893 | Wavelength division multiplexing optical repeating transmission method and repeating apparatus A repeating apparatus disposed at an end point of each divisional repeating interval of a light transmission line performs a first dispersion compensation step, an optical add/drop multiplexing step and a second dispersion compensation step to perform repeating tran... | 11/10/2009 |
| 7613397 | Wavelength division multiplexing optical transmission system and wavelength dispersion compensation unit In the WDM optical transmission system, a high-slope dispersion compensator compensates wavelength dispersion produced in the optical transmission line. The high-slope dispersion compensator has a dispersion slope characteristic, by which a dispersion slope is subst... | 11/03/2009 |
| 7609969 | Method and system for compensating for optical dispersion in an optical signal A method for compensating for optical dispersion in an optical signal includes receiving an optical signal comprising a plurality of channels. The information being communicated in a first set of channels is modulated using a first modulation technique, and the info... | 10/27/2009 |
| 7606493 | Optical waveguide and optical multiplexer-demultiplexer The present invention provides an optical waveguide which comprises a core 4 for incident light and a core 5 for outgoing light, wherein the width of the core 5 for outgoing light is more than 1.5 times that of the core 4 for incident lig... | 10/20/2009 |
| 7542677 | Dispersion compensation method in optical communication system having optical add drop multiplexing capability Dispersion compensation values are set so as to be transmittable to any path groups in a WDM optical communication system having OADM nodes, which includes transmitting-end and receiving-end terminal nodes; a WDM optical communication transmission line including a p... | 06/02/2009 |
| 7539417 | Optical transmission system The invention relates to an optical transmission system which allows high quality transmission of signal light, and has a configuration that is suitable particularly for CWDM optical transmission. In the optical transmission system, signal channels outputted from no... | 05/26/2009 |
| 7526204 | Optical communication apparatus, optical communication system and method for transmitting optical signal The present invention relates to optical communication apparatuses such as OADM node, or OXC node. A receiving dispersion compensating module adjusts the accumulated dispersion of a wavelength-division-multiplexed optical signal such that the accumulated dispersion ... | 04/28/2009 |
| 7519295 | Apparatus and method for commissioning an optical transmission system An apparatus and method directed to testing and optimizing performance of an optical transmission system is disclosed, including at least one broadband dispersion compensation unit (DCU) or at least one depolarization device. The depolarization device may be used al... | 04/14/2009 |
| 7483635 | Multi-wavelength pulse generator using time-lens compression A method and apparatus for generating a multi-wavelength pulse train use a technique referred to as time-lens compression. The time-lens is formed of a phase modulator in series with a dispersion element. In addition to pulse compression, this time-lens simultaneous... | 01/27/2009 |
| 7466920 | Chromatic dispersion compensating apparatus In order to compensate for chromatic dispersion ad dispersion slope over an entire wavelength band of the optical signal, the wavelength band is split into a plurality of bands, and chromatic dispersion compensation is made to make chromatic dispersion in a central ... | 12/16/2008 |
| 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 |
| 7437048 | Equipment bay cable management system A cable management system is provided that is configured to be located between adjacent equipment racks, while being vertically oriented to extend upward along a narrow space between the adjacent equipment racks. The cable management system comprises a main panel ex... | 10/14/2008 |
| 7433599 | Automatic dispersion compensation device and compensation method The automatic dispersion compensation device of the present invention comprises a unit measuring the transmission quality of incoming optical signals for one or more channels input from a transmission line and a unit separating and detecting the transmission quality... | 10/07/2008 |
| 7428096 | Optical pulse compressor, optical function generator, optical pulse compression method, and optical function generation method A small-sized, high-functionality optical pulse compressor capable of generating a low-power, high-repetition-frequency ultrashort pulse train used for ultrafast optical communication and photometry, and a simple-structure optical function generator for realizing an... | 09/23/2008 |
| 7424229 | Methods and apparatus for Raman crosstalk reduction via idle data pattern control Methods and apparatus are provided for reducing Raman crosstalk in a wavelength-division-multiplexing (WDM) optical fiber transmission system that transmits a multiplex of channels. Idle data is sent over one or more of the channels of the WDM system in order to mai... | 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 |
| 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 |
| 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 |
| 7403714 | All optical chromatic and polarization mode dispersion correctors The present invention provides an all optical system for correcting optical dispersions including at least one optical chopping device having an input terminal for receiving a first signal, which has been broadened by optical dispersions and corresponds to an optica... | 07/22/2008 |
| 7394993 | Dispersion compensation quantity setting method, receiving terminal station, and wavelength-multiplexing optical transmission system In a dispersion compensation quantity setting technique for use in a WDM transmission system, a transmitting terminal node transmits CW light and modulated light obtained by modulation using a modulation pattern signal, while a receiving terminal node detects a phys... | 07/01/2008 |
