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7627251 Wavelength division and polarization division multiple access free space optical terminal using a single aperture  
A communication device uses one or two stacks of reflective deflectors to steer the electromagnetic waves carrying signals received and transmitted through a single telescope/aperture device. The...
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...
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...
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...
7609976 Method and system for ultra-high bit rate fiber-optic communications  
A method and system for ultra-high bit rate fiber-optic communications (e.g., 160 Gb/s) utilize a phase-correlated modulation format where phases of bits in adjacent four-bit groups in transmitted...
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...
7603044 Polarization control for multichannel and polarization multiplexed optical transport networks  
A system and method are provided for calibrating orthogonal polarity in a multichannel optical transport network (OTN) receiver. The method accepts a composite signal and separates the polarization...
7596323 Optical communications systems, devices, and methods  
A method and apparatus for estimating fiber dispersion in an optical communication system including transmitting an optical signal carrying a unique word along an optical communication path,...
7590355 Method and apparatus for PMD mitigation in optical communication systems  
A scheme is described for mitigating the effects of polarization-mode dispersion (PMD) in a wave-division multiplex (WDM) optical communication system having one or more transmission links with one...
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,...
7583896 Optical-wireless hybrid transmission system and optical-wireless hybrid transmission method  
An optical transmitter of an optical-wireless hybrid transmission system according to the invention outputs a first single-mode optical signal (center frequency: f C1 ) to an optical receiver,...
7583895 Polarization scrambler, optical add/drop multiplexer, optical route switching apparatus and wavelength division multiplexing optical transmission system  
A polarization scrambler has a polarization state rotating unit rotating the polarization state of a signal light, and a rotation speed controlling unit controlling the rotation speed of the...
7577357 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 comprises a loop-form...
7570419 Quantum entanglement photon-pair producing device and quantum entanglement photon pair producing method  
In one embodiment of the present invention, a quantum entangled photon-pair producing device is disclosed which includes a superposed state generating device for generating a superposed state of...
7565037 Reducing depolarisation  
The present invention provides a method for reducing spreading of a pulse in a transmission line, said spreading being as a result of polarization mode dispersion, comprising inducing predetermined...
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...
7554885 Polarization diversity for optical fiber applications  
At least two light beams with polarization diversity are generated that each carry a representation of the same information. Separate optic fibers carry each of the at least two beams through a...
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 ( 6 a to 6 c ) for...
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...
7539422 Quantum optical transmission device  
In an optical detection method that requires a reference light such as homodyne detection, a signal light and the reference light must be equal to each other in the wavelength, and the phase...
7532822 Clock recovery from an optical signal with polarization impairments  
A method of recovering a clock signal from an optical signal received through an optical communications system. A digital sample stream is processed to generate a dispersion compensated signal. The...
7522841 Efficient data transmission and training of data processing functions  
A method of a conveying data through an optical communications system. An optical signal is received through the optical communication system, the optical signal comprising data symbols and SYNC...
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...
7486898 Receiver for PMD mitigation by polarization scrambling  
A receiver ( 10 ) for an optical signal containing a time jitter and a time-varying distortion caused by a periodic polarization scrambled signal comprises at least one decision gate ( 11 ) and a...
7486897 Polarization duobinary optical transmitter  
A polarization duobinary optical transmitter is disclosed. The transmitter includes a precoder for coding an electric signal and a light source for generating continuous light. The transmitter also...
7486895 Effective control algorithm for optical polarization mode dispersion compensators  
The present invention includes apparatus and method of a variable step size dithering control algorithm for polarization mode dispersion controllers (PMDCs). The dithering step size of the PCs is...
7486433 High-luminance quantum correlation photon beam generator  
A high-luminance quantum correlation photon beam generator in which a laser light source ( 1 ) emits a laser pumped light and a parametric crystal ( 2 ) generates a pair of two photons of a signal...
7483642 Receiver for OTDM/PDM optical signals  
A receiver for an OTDM/PDM pulse train ( 10 ) in which the pulses ( 12 ) have alternating polarizations (P 1, P 2 ) has a polarization insensitive optical switch ( 16; 161, 162, 163, 164 ) for...
7466923 Polarization mode dispersion compensation  
Methods and systems for PMD compensation in an optical communication system are implemented by transmitting multiple optical signals through a common optical conduit to an optical compensator that...
7457548 Quantum optical transmission device and quantum optical generator device therefor  
A squeezed light generator comprises an arbitrary optical fiber, a means for temporally separating two linearly polarized components, two Faraday rotators and a high-reflection mirror. Pulse lights...
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...
7447436 Optical communications using multiplexed single sideband transmission and heterodyne detection  
A transmitter subsystem generates an optical signal which contains multiple subbands of information. The subbands have different polarizations. For example, in one approach, two or more optical...
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 y 1...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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.
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...
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...
7308204 Noise suppressing method and apparatus thereof  
In the invention, an input light including a signal light and a noise light within a signal wavelength band of the signal light is divided into a first component with a polarization parallel to a...
7305183 Measurement of polarization dependent loss in an optical transmission system  
A method and system enables measurement of polarization dependent loss (PDL) in an optical communications system including a plurality of cascaded optical components. An optical signal having a...
7302187 Minimum transmitted photon quantum optical communications system  
A system parametrically down-converts a photon into a pair of first and second quantum-entangled photons. A transmitter is coupled to receive the first photon and includes an irreversible collapse...
7283752 Method and apparatus for PMD/PDL/PDG mitigation  
An optical communication method and apparatus are provided, the apparatus including polarization controllers, and drive circuitry for driving the polarization controllers at a plurality of...
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