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| Number | Title | Issue Date |
| 8145063 | Method and device for readjusting a polarization drift For readjusting a polarization drift in the transmission of a polarization-encoded optical signal from a transmitter via a light guide to a receiver, optical auxiliary signals having the same wavelength as the polarization-encoded signal as well as different polariz... | 03/27/2012 |
| 8135283 | Clock recovery with channel coefficients In a coherent optical receiver of an optical communications network, a method of recovering a clock signal from a high speed optical signal received through an optical link. A set of compensation vectors are adaptively computed for compensating Inter-symbol Interfer... | 03/13/2012 |
| 8086109 | Polarization multiplexed optical transmitting and receiving apparatus In a polarization multiplexed optical transmitting and receiving apparatus, output light from a light source section of a transmission unit is separated in a polarization separating section, and then modulated in first and second modulation sections, and the modulat... | 12/27/2011 |
| 8068742 | Phase shift keyed modulation of optical signal using chirp managed laser A high-speed optical transmitter comprises multiple digital lanes that are provided to a bank of digital-to-analog converters. The analog signals are then used to Phase Shift Keyed (PSK) modulation using a Chirp Managed Laser (CML)-based transmitter, and potentially... | 11/29/2011 |
| 8068741 | Polarization to phase converter The invention provides an apparatus and method for time delaying different polarization components of a signal relative to one another, comprising a polarization signal splitter which splits first and second polarization components of an input signal into a first co... | 11/29/2011 |
| 8000610 | Monitoring mechanisms for optical systems This application describes optical monitoring devices and applications in optical systems for monitoring various optical parameters of light, including the signal to noise ratio, the degree of polarization, and the differential group delay (DGD). ... | 08/16/2011 |
| 7983567 | Method and system for polarization modem dispersion compensation The invention relates to a method and a system for controlling a PMD compensator (2). For this purpose, a measuring signal (MS) is branched off from an already compensated optical data signal (ODSK) and supplied to a polarization adjuster (2). The outp... | 07/19/2011 |
| 7974540 | Communication system and communication method using the same A communication system capable of employing polarization-dependent phase modulators with a reversing configuration that preserves security against disturbance of a polarization state at a transmission path but without using Faraday mirrors and a communication method... | 07/05/2011 |
| 7962043 | Multichannel optical transport network skew control A system and method are provided for controlling time delay in a multichannel optical transport network transmission device. The method accepts a pair of 2n-phase shift keying (2nPSK) modulated signals via Ix and Qx electrical signal paths, whe... | 06/14/2011 |
| 7903977 | Method for polarization-based intrusion monitoring in fiberoptic links A fiber optic communication system including a fiber optic link, a transmitter system and a receiver system. The transmitter system includes a laser source producing a light beam, and a polarization controller receiving the light beam and providing an expected patte... | 03/08/2011 |
| 7894724 | Method and apparatus for improving dual-polarization optical communication performance A method and system for averaging the effects of polarization distortions across a multitude of transmitted data streams in a dual polarization multiplexed optical communications system. Data streams are interleaved amongst each other in accordance with a predetermi... | 02/22/2011 |
| 7769300 | Reducing the distortion of optical pulses caused by polarization mode dispersion in optical communication systems A method and device for reducing the distortion of optical pulses caused by the polarization mode dispersion in optical communication systems is provided. When an optical pulse having any polarization is transmitted through an optical communication system, which is ... | 08/03/2010 |
| 7660533 | Quantum Fourier transform based information transmission system and method A method of data compression and transmission include splitting a wave function representative of an input data set into an arbitrarily oriented elliptical polarization state and a comparator wave function state, the comparator wave function state being transmitted ... | 02/09/2010 |
| 7620326 | Method for transmitting at least one first and second data signal in polarization multiplex in an optical transmission system The invention relates to a method for transmitting at least one first and second data signal in polarization multiplex. To this end, the invention provides that, in a first step, the first data signal is, on the transmit side, modulated to a sideband of a first carr... | 11/17/2009 |
| 7616898 | Method of operating an optical transmission system with a bit-to-bit polarization interleaved bitstream A method of operating an optical transmission system is described. The transmission system is provided with a bit-to-bit polarization interleaved bitstream having a given bitrate. The transmission system comprises a birefringent element and/or a decision circuit. Th... | 11/10/2009 |
| 7606498 | Carrier recovery in a coherent optical receiver A method of carrier recovery from a high speed optical signal received through an optical communications network. A stream of multi-bit digital samples of the optical signal is processed to generate a multi-bit estimate X′(n) of each one of a plurality of transmit... | 10/20/2009 |
| 7587142 | Method for estimating the polarization mode dispersion compliant capacity fraction of the total optical frequency transmission window of a transport system A method and system for estimating a fraction of an optical transmission system's transmission window that is compliant with the system's polarization mode dispersion (PMD) outage specifications, the optical transmission system including Ns optical fiber ... | 09/08/2009 |
| 7555221 | Method and apparatus for polarization-independent RF spectrum analysis of an optical source A method and apparatus for polarization-independent RF spectrum analysis of an optical source, the apparatus including a coupler for coupling the light from an optical source under test with light from a continuous-wave (CW) laser. A nonlinear apparatus is coupled t... | 06/30/2009 |
| 7546039 | Systems, devices, and methods for controlling outage probabilities Certain exemplary embodiments comprise a method that can comprise, responsive to an instruction to change a setting of a polarization controller, automatically changing a first rotational speed of a birefringent plate associated with the polarization controller to o... | 06/09/2009 |
| 7546040 | Fiber optical system for PMD mitigation by polarization scrambling A fiber optical system (10) for transmitting an optical signal comprises an optical fiber line (1) with a plurality of successively arranged polarization scramblers (6a to 6c) for polarization modulation of the optical signa... | 06/09/2009 |
| 7509054 | Method for the transmission of optical polarization multiplex signals Binary signals are converted at the transmission end into two optical signals which are combined into a polarization multiplex signal and are then transmitted. The transmitted polarization multiplex signal is divided at the receiving end into two polarized signal pa... | 03/24/2009 |
| 7447441 | Signal transmission apparatus and a method of signal transmission An apparatus and method of transmitting a plurality of polarized signals having different wavelengths through a length of signal transmission cable which changes the polarization of the signals in correspondence with their amplitudes and wavelengths. A dynamic filte... | 11/04/2008 |
| 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 |
| 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 |
| 7421210 | Optical transmission method and system An optical transmitter splits a linear polarization optical carrier into a TE wave and a TM wave. One of the TE wave and the TM wave is phase-modulated with a transmission data so as to generate a phase-modulated signal. The phase-modulated signal and the other one ... | 09/02/2008 |
| 7409157 | Optical switch The present invention provides an optical switch in which a switching operation is not affected even when the polarization state of a control light varies. The optical switch includes a loop-form optical waveguide loop circuit formed from an optical nonlinear medium... | 08/05/2008 |
| 7409166 | Device and a method for processing a digital signal in a bit-to-bit polarization-interleaved format of an optical transmission system A device for processing a digital signal of an optical transmission system is described. The device comprises: a polarization beam splitter for receiving the signal, a phase shifter for shifting the phase of the signal at the orthogonal output of the polarization be... | 08/05/2008 |
| 7405820 | Optical spectrum analyzing device by means of Brillouin scattering and associated measurement process The invention relates to a device which is used for the spectral analysis of optical signals and which is based on the stimulated Brillouin scattering effect. The invention also relates to the associated measurement method which makes use of the optical signal ampli... | 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 |
| 7391977 | Monitoring mechanisms for optical systems This application describes optical monitoring devices and applications in optical systems for monitoring various optical parameters of light, including the signal to noise ratio, the degree of polarization, and the differential group delay (DGD). ... | 06/24/2008 |
| 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 |
| 7369773 | 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... | 05/06/2008 |
| 7362445 | Active control and detection of two nearly orthogonal polarizations in a fiber for heterodyne interferometry A polarization control system includes a light source that generates two light beams with different polarization states and optical frequencies. A polarization state modulator changes the polarization states of the two light beams. A first detector path generates a ... | 04/22/2008 |
| 7362977 | Method for reduction of non-linear intra-channel distortions A method for reducing intra-channel, non-linear distortions of an optical signal resulting from non-linear fiber propagation includes applying a polarization mode dispersion (PMD) pre-distortion to an optical signal such that the PMD pre-distortion produces two repl... | 04/22/2008 |
| 7356206 | Integrated optics polarization beam splitter using form birefringence A method for separating the orthogonal polarization components of an incident optical signal into two spatially separated output ports is described. The method comprises a Mach-Zehnder interferometer where one of the two branches has a section of waveguide that exhi... | 04/08/2008 |
| 7352971 | Broadband control of polarization mode dispersion A method and system is provided for compensating polarization mode dispersion (PMD) in an optical communications system includes a controller designed to control a broadband PMD compensator to differentially delay light at each one of a plurality of selected wavelen... | 04/01/2008 |
| 7343100 | Optical communications based on optical polarization multiplexing and demultiplexing This application describes techniques for optical multiplexing and demultiplexing in optical communication systems based on polarization multiplexing of different signal channels. ... | 03/11/2008 |
| 7340148 | Methods and systems for controlling fiber polarization mode dispersion (PMD) A method is provided for predicting an installed performance parameter of an optical fiber cable. The method includes obtaining a measurement indicative of a value of the performance parameter at a first moment in time. A measurement indicative of a value of the per... | 03/04/2008 |
| 7330653 | Quantum dense coding system A Quantum Dense Coding System. The system includes a source, a transmitter and a receiver. The source is capable of down-converting a pump photon into a signal photon and an idler photon and outputting probability amplitudes, the signal photon and the idler photon, ... | 02/12/2008 |
| 7312909 | Method for synchronizing the phase of optical return-to-zero (RZ) data signals In order to synchronize the phases of two RZ data signals (RZS1, RZS2) combined to form a time multiplex signal (MS1), the power of half the fundamental made of the multiplex signal (MS1) is measured and the phase difference is controlled... | 12/25/2007 |
