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| Number | Title | Issue Date |
| 8184993 | Polarization mode dispersion (PMD) compensation in polarization multiplexed coded orthogonal frequency division multiplexing (OFDM) systems A receiver and method are provided. The receiver includes a detector configured to receive polarization multiplexed coded orthogonal frequency division multiplexing input sequences and generate estimates of unknown transmitted symbols in the input sequences for x- a... | 05/22/2012 |
| 8107827 | Method and apparatus for reception of optical signals An apparatus and method are provided for receiving an optical signal having an optical carrier component and at least one information-bearing optical sideband. In general, an optical filter arrangement (110) is used to separate the optical carrier component f... | 01/31/2012 |
| 8073345 | Frequency estimation in an intradyne optical receiver A method for determining symbols PSK modulated on an optical carrier includes interfering a first polarization component of the modulated optical carrier and a reference optical carrier in a first optical mixer and interfering the first polarization component of the... | 12/06/2011 |
| 8014685 | Coherent optical receiver A coherent optical receiver of the invention combines local oscillator light having orthogonal polarization components in which the optical frequencies are different to each other, and received signal light, in an optical hybrid circuit, and then photoelectrically c... | 09/06/2011 |
| 8014686 | Polarization demultiplexing optical receiver using polarization oversampling and electronic polarization tracking An optical receiver utilizes differential quadrature phase-shift keying (DQPSK) demodulation and electrical crosstalk rejection to relax requirements on filter misalignment with a carrier signal and to enable electronic polarization demultiplexing of optical signals... | 09/06/2011 |
| 7957654 | Coherent optical receiver A coherent optical receiver of the invention combines local oscillator light having orthogonal polarization components in which the optical frequencies are different to each other, and received signal light, in an optical hybrid circuit, and then photoelectrically c... | 06/07/2011 |
| 7860406 | PMD insensitive direct-detection optical OFDM systems using self-polarization diversity A self-polarization diversity technique to combat PMD in a direct-detection optical OFDM system. This technique does not require any dynamic polarization control, and can simultaneous compensate PMD in a WDM system with one device. Simulation results show that this ... | 12/28/2010 |
| 7826752 | Optical transmission apparatuses, methods, and systems Apparatuses, systems, and methods are disclosed that provide for an agile coherent optical modem that can generate agile RF waveforms and data rates on a generic opto-electronic hardware platform. An “agile coherent optical modem” [ACOM] approach to optical comm... | 11/02/2010 |
| 7822350 | Reconstruction and restoration of two polarization components of an optical signal field Digital compensation of the polarization-mode dispersion (PMD) effects experienced by an optical signal in a transmission link is achieved. A digital representation of the optical fields of two orthogonal polarization components of an optical signal, defined by a po... | 10/26/2010 |
| 7668468 | Numerous user laser communications optical system using chromatic waveplates and a common telescope aperture The present invention relates to a numerous user laser communications optical system. Numerous optical signals comprising a number of channels are simultaneously received and demultiplexed (and/or multiplexed and transmitted) at a numerous access communication devic... | 02/23/2010 |
| 7613403 | Differential multilevel modulated optical signal receiver apparatus A first optical splitter splits an input optical signal and outputs it to first and second optical paths. A second optical splitter outputs the optical signal from the first optical path to third and fourth optical paths. A third optical splitter outputs the optical... | 11/03/2009 |
| 7599630 | Coherent optical detection and signal processing method and system A method and system of coherent detection of optical signals. The system utilizes a digital signal processor to recover an incoming optical signal. The system employs a local oscillator, which does not need to be phase locked to the signal. The signal may be consist... | 10/06/2009 |
| 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 |
| 7406269 | Feedback-controlled coherent optical receiver with electrical compensation/equalization An optical coherent receiver in one embodiment has a heterodyne configuration, and in another embodiment has a homodyne configuration, in each configuration employs multiple feedback signaling and analog/digital processing to optimize response to a modulated optical... | 07/29/2008 |
| 7376360 | Optical device for extracting a sideband signal from a composite signal including orthogonally modulated signals An optical device extracts an information bearing sideband such as an FSK or SCM signal (label) from a composite signal that includes the sideband and an orthogonally modulated signal such as an intensity modulated signal (payload) by employing polarization beam spl... | 05/20/2008 |
| 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 |
| 7343104 | Apparatus and method for receiving a quadrature differential phase shift key modulated optical pulsetrain An optical differential phase shift key (DPSK) receiver, a method of demodulating an optical DPSK modulated signal and an optical processor capable of operating as either a DPSK receiver or DPSK transmitter. In one embodiment, the DPSK receiver includes: (1) an opti... | 03/11/2008 |
| 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 |
| 7317847 | Optical fibers, devices and methods for making same The invention relates to an asymmetric optical fiber that includes a core and a functional cladding that surrounds substantially half of the core along at least a portion of the fiber. The asymmetric optical fiber may include substantially parallel electrodes dispos... | 01/08/2008 |
| 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 |
| 7315699 | Optical device for extracting a sideband signal from a composite signal including orthogonally modulated signals An optical device extracts an information bearing sideband such as an FSK or SCM signal (label) from a composite signal that includes the sideband and an orthogonally modulated signal such as an intensity modulated signal (payload) by splicing the composite signal i... | 01/01/2008 |
| 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 |
| 7280770 | Polarization diverse optical receiver using a polarization-dependent beam splitter A receiver and method for using the same to process optical signals is disclosed. The receiver includes an optical coupler and a polarization dependent beam splitter. The optical coupler combines an input signal and a local oscillator signal into a first combined si... | 10/09/2007 |
| 7269359 | Focal plane array with synchronous detection circuits for an active remote sensing system The invention provides a synchronous detector for a unit cell of a read out integrated circuit (ROIC). The synchronous detector includes a bipolar photo-detector formed in a focal plane array (FPA) for sensing light energy. The bipolar photo-detector has one end cou... | 09/11/2007 |
| 7265837 | Sensitive polarization monitoring and controlling Techniques and devices for monitoring polarization of light using at least two polarization elements where the difference between the outputs of the two polarization elements are used to monitor a change in polarization. ... | 09/04/2007 |
| 7266310 | Digital compensation for optical transmission system A receiver for an optical transmission system, has a polarization diverse and phase diverse coherent optical receiver, and a digital adaptive equalizer for compensating for distortions in the optical signal introduced by the optical path. The entire field of the opt... | 09/04/2007 |
| 7212748 | Frequency detection circuit, optical receiver and optical transmission system using the same When a PLL circuit is used to extract and recover clock component from an information data signal, where an optical receive signal has been converted into an electrical signal, and to monitor the frequency of a recovered clock, a low frequency section frequency dete... | 05/01/2007 |
| 7209670 | Polarization diversity receiver for optical transmission system A polarization diversity receiver has an optical section for converting the received optical signal into four or five polarization diverse component optical signals that substantially represent amplitude and polarization state information of the received optical sig... | 04/24/2007 |
| 7209660 | Optical communications using heterodyne detection An optical communications system includes a receiver subsystem with at least two heterodyne receivers. The receiver subsystem receives a composite optical signal having two or more subbands of information and corresponding tones. An optical splitter splits the compo... | 04/24/2007 |
| 7202996 | Optical amplifier For setting the optical gain of an optical amplifier such as a Raman amplifier that is connected in a wavelength division multiplexing (WDM) system, the gain of the amplifier is made dependent on the states of optical polarizers connected to individual inputs of a W... | 04/10/2007 |
| 7171129 | Optical communication system using coherence multiplexing in an optical DWDM network The present invention comprises an optical communication system, including apparatuses and methods, which use coherence multiplexing to optically multiplex different signals that may have varying protocols or operate at different speeds, onto a single wavelength cha... | 01/30/2007 |
| 7167651 | System and method for code division multiplexed optical communication A system for optical communication forms a family of orthogonal optical codes modulated by a data stream. The orthogonal codes are formed by creating a stream of evenly spaced-apart pulses using a pulse spreader circuit and modulating the pulses in amplitude and/or ... | 01/23/2007 |
| 7146103 | 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 polarization. For example, in one approach, two or more optical transmitters generate optical signals which have different polarization. ... | 12/05/2006 |
| 7136426 | Communication system including a wire network linked with another network via radio waves A vehicle-vehicle communication system includes an in-vehicle wire LAN established in a vehicle. The in-vehicle wire LAN includes a plurality of devices connected by optical fiber links. A terminal for radio vehicle-vehicle communication is connected to the in-vehic... | 11/14/2006 |
| 7110677 | Method and system for optical time division multiplexed fiber communications with coherent detection The present invention relates to a receiver for receiving a time division multiplexed (TDM) optical signal, which is formed of a plurality of interleaved optical pulse streams. Each optical pulse stream includes a plurality of optical pulses. The receiver includes a... | 09/19/2006 |
| 7106807 | Method for estimating the frequency shift of a CPFSK signal A method for estimating the frequency shift of a CPFSK signal includes scanning the CPFSK signal. Intermediate signal values are determined for the scanned CPFSK signal. An estimated value (ν) is determined for the frequency shift of the CPFSK signal by assessing a... | 09/12/2006 |
| 7103279 | Architecture for wireless transmission of high rate optical signals An apparatus for a wireless transmission of high data rate signals such as received from an optical interface including gigabit fiber channel or a sonet. The architecture combines direct detection of the optical signal with clock and data recovery circuit and a diff... | 09/05/2006 |
| 7095963 | Multi-channel optical receiver for processing tri-cell polarization diversity detector outputs An optical receiver system for processing signals output from a polarization diversity detector that includes a plurality of photodetector cells. Each cell provides an signal that includes a phase generated carrier signal having a modulation frequency ω and a senso... | 08/22/2006 |
| 7076169 | System and method for orthogonal frequency division multiplexed optical communication A system for optical communication send optical signals over a plurality of wavelength channels. Each wavelength channel comprises a number of orthogonal subchannel frequencies which are spaced apart from one another by a predetermined amount. Each of the subchannel... | 07/11/2006 |
| 7068944 | Multi-function optical performance monitor An optical monitor that generates a signal indicative of at least two optical properties of an input optical signal. The monitor utilizes a polarization dependent beam splitter having a signal input port, a mixing signal input, a first output port and a second outpu... | 06/27/2006 |
