Inphi Corporation

Clariphy Communications, Inc.

Jinwoo Cho

Shih Cheng Wang

Shu Hao Fan

Oscar Ernesto Agazzi

Mario Rafael Hueda

Diego Ernesto Crivelli

Hugo Santiago Carrer

Norman L Swenson

Thomas A Lindsay

Alfredo Javier Taddei

Daniel A Tauber

Systems and methods described herein include methods and systems for controlling bias voltage provided to an optical modulating device. The optical modulating device is biased at a bias point that is different from a null point of the device such that an offset to the received optical power due to limited extinction ratio is reduced.

Systems and methods for biasing optical modulating devices

A receiver applies a calibration method to compensate for skew between input channels. The receiver skew is estimated by observing the coefficients of an adaptive equalizer which adjusts the coefficients based on time-varying properties of the multi-channel input signal. The receiver skew is compensated by programming the phase of the sampling clocks for the different channels. Furthermore, during real-time operation of the receiver, channel diagnostics is performed to automatically estimate differential group delay and/or other channel characteristics based on the equalizer coefficients using a frequency averaging or polarization averaging approach. Framer information can furthermore be utilized to estimate differential group delay that is an integer multiple of the symbol rate. Additionally, a DSP reset may be performed when substantial signal degradation is detected based on the channel diagnostics information.

Reset in a receiver using center of gravity of equalizer coefficients

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Jinwoo Cho