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| Number | Title | Issue Date |
| 8184973 | Direct detection for receiving polarization multiplexing signals There is provided a method for detecting optical signals comprising employing a photo diode to both directly detect a received optical signal and convert it into an electrical signal for recovery of data bit stream information in the received optical signal, the rec... | 05/22/2012 |
| 8121480 | Methods and apparatus for recovering first and second transmitted optical waves from a polarization multiplexed optical wave First and second transmitted optical waves having orthogonal polarization states are combined in a polarization multiplexed optical wave. At an optical receiver, an electrical field of the polarization multiplexed optical wave is measured. A plurality of polarizatio... | 02/21/2012 |
| 8103166 | Multi-wavelength coherent receiver with a shared optical hybrid and a multi-wavelength local oscillator An exemplary apparatus for digital coherent detection of a multi-wavelength signal includes a polarization-diversity optical hybrid, at least four Wavelength De-Multiplexing (W-DMUX) filters, 4M detectors, and 4M analog-to-digital converters (ADCs), with M an intege... | 01/24/2012 |
| 8098989 | All-optical wavelength conversion for a polarization multiplexing optical signal An apparatus includes a first laser source for providing a first lightwave; a first optical coupler that is polarization maintaining for dividing the first lightwave into first and second optical carrier lightwaves; first and second modulators for modulating respect... | 01/17/2012 |
| 8073328 | Use of polarization for differentiation of information The present invention discloses a system for signalling within optical or combined optical/electronic networks wherein a first transmission node executes polarization multiplexing on transmitted traffic, and at one or more intermediate nodes one or more of the follo... | 12/06/2011 |
| 8064767 | Optical orthogonal frequency division multiplexed communications with coherent detection The present invention provides a system and method of optical communications that utilize coherent detection technique and optical orthogonal frequency division multiplexing for phase encoded data transmission. In particular the invention addresses a device and meth... | 11/22/2011 |
| 8045855 | Systems and methods for the mitigation of polarization mode dispersion impairments in fiber optic links The present invention provides systems and methods for the mitigation of PMD impairments in fiber optic links. The present invention utilizes synchronous polarization modulation and digital control of polarization modulation, instead of independent polarization modu... | 10/25/2011 |
| 8045856 | Polarization mode dispersion compensation and polarization demultiplexing systems and methods for optical transmission systems The present disclosure provides polarization mode dispersion compensation (PMDC) and polarization de-multiplexing systems and methods for polarization multiplexed (PolMux) optical transmission systems. The PMDC detects an error signal before a polarization splitter ... | 10/25/2011 |
| 8032025 | Polarization monitoring in polarization division multiplexing in optical communications Systems and techniques for optical communications based on polarization division multiplexing are described. ... | 10/04/2011 |
| 8005360 | PMDC feedback signal for alternate polarization DPSK system A feedback signal indicative of the average RF power of an APol-DPSK optical signal is used by a PMD compensator to adjust the amount of compensation applied to the optical signal. ... | 08/23/2011 |
| 7920790 | Polarization envelope modulation for signaling and labeling in optical networks The present invention is directed to an in-passband signaling method. The method includes the steps of extracting a control component and a data component from an optical signal. The control component may be used to determine the state of an optical switch in either... | 04/05/2011 |
| 7917031 | Method and device for stabilizing the state of polarization of a polarization multiplexed optical radiation A device and method for stabilizing the polarization of polarization multiplexed optical radiation includes an identified channel which is provided with a pilot signal. The device and method are based on providing to the polarization multiplexed optical radiation a ... | 03/29/2011 |
| 7865080 | Methods for the optical transmission of polarization multiplex signals In order to reduce mutual interferences between POLMUX and signals, the signals are transmitted with differed to each other carrying signals, thereby making it possible to obtain the circular polarization of each resulting POLMUX signal. Each second POLMUX signal is... | 01/04/2011 |
| 7747169 | Adaptive polarization tracking and equalization in coherent optical receivers A method for operating an optical receiver includes at each of a sequence of sampling times, producing a first 2D complex digital signal vector whose first component is indicative of a phase and amplitude of one polarization component of a modulated optical carrier ... | 06/29/2010 |
| 7742699 | Method and arrangement for the optical transmission of data signals via differential phase modulation in a polarization multiplex method Two data signals are subjected to a binary differential phase modulation and transmitted as POLMUX multiplex signals. The types of modulation are selected in such a way that they are orthogonal in relation to each other and do not influence each other during the dem... | 06/22/2010 |
| 7715717 | Processes and devices for the determination of a PMD-induced outage probability of an optical transmission system The present invention proposes a method whereby during a specified/specifiable observation period (Ttotal) , the polarization states of optical transmission system and/or the optical signals transmitted by the optical transmission system are changed by ap... | 05/11/2010 |
| 7672589 | Method and polarization-multiplex system for reducing the signal degradation of an optical polarization-multiplex signal Method for reducing signal degradation in an optical polarisation-multiplex system. The modulated optical signals to be transmitted are synchronised or generated such that the phase difference for NRZ-modulated signals is at least approximately 0° and the phase dif... | 03/02/2010 |
| 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 polarization state in the polarization state rotating unit on the basis of ... | 09/01/2009 |
| 7539415 | Optical packet communication system using labeling of wavelength-offset polarization-division multiplexing Disclosed is an optical packet communication system using a wavelength-offset polarization-division multiplexing labeling. An optical signal transmitter which is provided at an ingress node positioned at a sending end in an optical packet switching network, generate... | 05/26/2009 |
| 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 |
| 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 |
| 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 |
| 7366414 | Method and apparatus utilizing tunable differential group delay A method and apparatus for utilizing tunable differential group delay with at least a component of a fiber optic transmission system includes providing a tunable differential group delay system that is optically connected to a component of the fiber optic transmissi... | 04/29/2008 |
| 7366209 | Orthogonal polarization multiplexing transmission apparatus and multiplexing method used for the same An orthogonal polarization multiplexing transmission apparatus capable of performing dispersion compensation considering a short wavelength side and a long wavelength side of a zero dispersion wavelength. A plurality of light signals of different wavelengths are div... | 04/29/2008 |
| 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 |
| 7349089 | High transmission multi-wavelength filter and method An optical arrangement and method of filtering include a beam splitter that accepts an incident beam and transmits light from the incident beam of a first polarization and reflects light from the incident beam of a second polarization. The transmitted light is a fir... | 03/25/2008 |
| 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 |
| 7330651 | Optical amplifying apparatus, optical transmission system and method of adjusting optical transmission loss An optical amplifying apparatus connected mutually through an optical transmission line includes an optical detecting unit for detecting an input level of an amplified spontaneous emission (ASE) light, an optical amplifying unit for amplifying a signal light, and an... | 02/12/2008 |
| 7324752 | Optical packet switching apparatus and methods An optical packet switch switches optical packets according to bit-rates at which the optical packets are provided. For example, optical packets that are received at similar bit-rates may be routed to a destination at separate time slots over a single channel wavele... | 01/29/2008 |
| 7324756 | Optical demultiplexer and optical transmission system It is an object of the present invention to provide an optical transmission system in which multiple optical frequencies can be efficiently used and the change of the system can be easily made, and to provide an optical demultiplexer suitable for such optical transm... | 01/29/2008 |
| 7315575 | Equalization strategy for dual-polarization optical transport system A method is provided for an equalization strategy for compensating channel distortions in a dual-polarization optical transport system wherein the received signal includes a complex signal of a first transmitted polarization component and a complex signal of a secon... | 01/01/2008 |
| 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 predetermined initial polarization state is launched into the optical co... | 12/04/2007 |
| 7298540 | Equalizing optical wavelength routers A dynamic equalizing optical channel router includes an input port for receiving a wavelength division multiplexed composite optical signal comprising a plurality of channels; at least one output port; a diffraction grating optically coupled to the input and output ... | 11/20/2007 |
| 7295781 | 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 adjustably rotates the polarization states of the multiple optical si... | 11/13/2007 |
| 7289735 | Apparatus for emitting light with controllable degree of polarization A laser apparatus is disclosed combining polarized light beams from two optical emitters into a combined beam of light with controllable degree of polarization (DoP). The laser apparatus includes a polarization combiner for combining the polarized beams into the com... | 10/30/2007 |
| 7289708 | Method and system for the controlled production of polarization mode dispersion A method and a system to produce, either in numerical simulations or in experiments, specified amounts of first, second and higher order PMD in a controlled manner, in particular large amounts. Parameters can be adjusted to obtain specific ranges of first, second an... | 10/30/2007 |
| 7286288 | Method and system for flexible and cost effective dynamic tilt gain equalizer Method and system for flattening tilt gain with a digital title gain equalizer (“DTGE”) constructed with a linear tilt optical filter (“LTOF”). In a first embodiment, a DTGE flattens tilt gain with a combination of LTOF and a rotative half-wave plate. In a s... | 10/23/2007 |
| 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 frequencies such that the penalties from PMD, PDL and PDG are mitigated. ... | 10/16/2007 |
| 7280764 | Optical signal multiplexer/demultiplexer employing pseudorandom mode modulation An optical signal multiplexer/demultiplexer using an orthogonal pseudorandom (PRN) coding scheme for optical mode modulation to produce a plurality of independent optical signals that may be combined into one multiplex signal for transmission over an optical fiber t... | 10/09/2007 |
