OPNEXT SUBSYSTEMS, INC.
|OPNEXT SUBSYSTEMS, INC. Patent applications|
|Patent application number||Title||Published|
|20130170829||Optical Coherent Receiver Optimization - Coherent optical receiver performance is optimized and made adaptable to changing optical channel conditions by providing feedback loops to adjust receiver parameters based on measured receiver performance.||07-04-2013|
|20130071109||Automatic Gain Control for High-Speed Coherent Optical Receivers - Feed-forward and feedback strategies are used to control local oscillator power and transimpedance amplifier gain in a high-speed coherent optical receiver.||03-21-2013|
|20120288275||Polarization and Differential-Group-Delay Insensitive Digital Timing Error Detection for Polarization-Multiplexed Coherent Optical Systems - Digital timing error detection systems and techniques are described. The described techniques are independent of polarization and differential-group-delay and are used to perform timing recovery of polarization-multiplexed coherent optical systems.||11-15-2012|
|20120251099||Multiplexer Lane Alignment for High-Speed Data Systems - Patterns detected by a low-speed receiver at the output of a high-speed multiplexer are used to determine when multiplexer input lanes are deskewed.||10-04-2012|
|20120250793||In-Phase and Quadrature Pattern Alignment for Quadrature Phase Shift Keying Optical Transmitters - I/Q data skew in a QPSK modulator may be detected by sending identical or complementary data streams to I and Q channel PSK modulators, setting the relative carrier phase between I and Q to zero or π, and monitoring the average QPSK output power, where the data streams sent to the I and Q channels include pseudorandom streams of ones and zeroes.||10-04-2012|
|20120250792||Alignment of In-phase and Quadrature Data in Quadrature Phase Shift Keying Optical Transmitters - I/Q data skew in a QPSK modulator may be detected by sending identical or complementary data streams to I and Q channel PSK modulators, setting the relative carrier phase between I and Q to zero or π, and monitoring the average QPSK output power, where the data streams sent to the I and Q channels include streams of alternating ones and zeroes.||10-04-2012|
|20120224847||Quadrature Time Skew Detection for Coherent Optical Signals - A method for detecting and measuring time skew in high-speed DP-QPSK coherent optical receivers is described.||09-06-2012|
|20120020659||Polarization Monitoring in Polarization Division Multiplexing in Optical Communications - Systems and techniques for optical communications based on polarization division multiplexing are described.||01-26-2012|
|20110236025||SUB-RATE SAMPLING IN COHERENT OPTICAL RECEIVERS - Apparatus and methods for optimizing the interplay between the sampling rate of an ADC of a receiver system and a bandwidth of analog anti-aliasing filters are described. The described technology can be used to mitigate aliasing for receiver systems that operate at fractional sampling rates by optimizing a bandwidth of optical and electrical filters included in the receiver systems.||09-29-2011|
|20100284702||Optical Receivers with Controllable Transfer Function Bandwidth and Gain Imbalance - Techniques, devices and systems based on optical receivers with controllable transfer function bandwidth and gain imbalance.||11-11-2010|
Patent applications by OPNEXT SUBSYSTEMS, INC.