Broadcom Corporation

Inphi Corporation

Clariphy Communications, Inc.

Lucent Technologies Inc.

At&t Bell Laboratories

Marvell Asia Pte., Ltd.

Broadcom Corpotation

Bradcom Corporation

Oscar Ernesto Agazzi

Mehdi Hatamian

Arthur Abnous

Mario Rafael Hueda

John L Creigh

Diego Ernesto Crivelli

Henry Samueli

Hugo Santiago Carrer

David E Kruse

Norman L Swenson

David Kruse

Paul Voois

Ramiro Rogelio Lopez

Martin Ignacio Del Barco

Jorge Manuel Finochietto

Alfredo Javier Taddei

Arya Behzad

Ramon Alejandro Gomez

Klaas Bult

Tom W Kwan

Chi-Hung Lin

Mauro Marcelo Bruni

Federico Nicolas Paredes

Elvio Adrian Serrano

Carl Grace

Vadim Gutnik

German Cesar Augusto Luna

Seyedmohammadreza Motaghiannezam

Martin Serra

Venugopal Gopinathan

Damian Alfonso Morero

Matias German Schnidrig

Martin Carlos Asinari

Facundo Abel Alcides Ramos

Alejandro Javier Schwoykoski

José Correa

Pablo Gianni

Ariel Pola

Ramiro Matteoda

Pablo Gustavo Quiroga

Roman Antonio Arenas

Nariman Yousefi

Mario Alejandro Castrillon

Shih Cheng Wang

David I Sorensen

Kenneth Phan Hung

Adrián Ulises Morales

German C Luna

Kenneth Ward Church

Geoffrey O Hatcher

Jeffrey Zachan

Michael Yeo

Damián Alfonso Morero

Andre Chartrand

María Laura Ferster

Nambirajan Seshadri

Pieter Vorenkamp

Kevin Tunghai Chan

Gottfried Ungerboeck

Keshab K Parhi

Myles H Wakayama

Mark Berman

Sang Bui

Christian Lutkemeyer

Shyh-Shiaw Kuo

Thomas A Lindsay

Steven R Norsworthy

Jinwoo Cho

William Arthur Gale

Daniel A Tauber

Taiho Koh

Maria Laura Ferster

Chinching Yen

Ulises Morales

Laura Maria Ferster

Cesar Sanchez Peñak

Alejandro Castrillon

A coherent optical receiver includes equalizer circuitry having a plurality of taps, the equalizer circuitry being configured to receive an input signal and compensate for polarization mode dispersion affecting the input signal to generate a compensated input signal. The coherent optical receiver further includes error evaluation circuitry configured to calculate a determinant of a frequency-domain (FD) coefficient-based matrix using a plurality of tap signals from among the plurality of taps, adjust an error of convergence of the compensated input signal to generate an adjusted input signal, and iteratively adjust the determinant of the FD coefficient-based matrix based on the adjusted input signal to minimize the error of convergence.

Tap centerer method and structure for coherent optical receiver

Methods of operating an optical communication system in coherent optical transmissions for metro applications. Relative to conventional solutions, the optical communication system can be implemented with reduced cost and can operate with reduced power consumption, while maintaining high data rate performance (e.g., 100G). Furthermore, a programmable transceiver enables compatibility with a range of different types of optical networks having varying performance and power tradeoffs. In one embodiment, the optical communication system uses 100 Gb/s dual-polarization 16-point quadrature amplitude modulation (DP-16QAM) with non-linear pre-compensation of Indium Phosphide (InP) optics for low power consumption.

Coherent optical transceiver with programmable application modes

A method and structure for tap centering in a coherent optical receiver device. The center of gravity (CG) of the filter coefficients can be used to evaluate a proper convergence of a time-domain adaptive equalizer. However, the computation of CG in a dual-polarization optical coherent receiver is difficult when a frequency domain (FD) adaptive equalizer is adopted. In this case, the implementation of several inverse fast-Fourier transform (IFFT) stages is required to back time domain impulse response. Here, examples of the present invention estimate CG directly from the FD equalizer taps and compensate for an error of convergence based off of the estimated CG. This estimation method and associated device architecture is able to achieve an excellent tradeoff between accuracy and complexity.

A method and structure for a coherent optical receiver device. Timing recovery (TR) is implemented after channel dispersion (i.e., chromatic dispersion (CD) and polarization mode dispersion (PMD)) compensation blocks. This architecture provides both improves performance and reduces power consumption of the device. Also, a TR loop is provided, enabling computing, by an error evaluation module, a first sampling phase error (SPE) and computing, by a timing phase information (TPI) module coupled to the error evaluation module, a second SPE from a plurality of CD equalizer taps PMD equalizer taps. The first and second SPE are combined into a total phase error (TPE) in a combining module, and the resulting TPE is filtered by a timing recovery (TR) filter coupled to an interpolated timing recovery (ITR) module and the combining module. The ITR module then synchronizes an input signal of the coherent optical receiver according to the TPE.

Tap stabilizer method and structure for coherent optical receiver

A method and structure for signal propagation in a coherent optical receiver device. Asynchronous equalization helps to reduce complexity and power dissipation, and also improves the robustness of timing recovery. However, conventional devices using inverse interpolation filters ignore adaptation algorithms. The present invention provides for forward propagation and backward propagation. In the forward case, the filter input signal is forward propagated through a filter to the adaptation engine, while, in the backward case, the error signal is backward propagated through a filter to the asynchronous domain. Using such forward and backward propagation schemes reduces implementation complexity while providing optical device performance.

Forward and backward propagation methods and structures for coherent optical receiver

A receiver (e.g., for a 10G fiber communications link) includes an interleaved ADC coupled to a multi-channel equalizer that can provide different equalization for different ADC channels within the interleaved ADC. That is, the multi-channel equalizer can compensate for channel-dependent impairments. In one approach, the multi-channel equalizer is a feedforward equalizer (FFE) coupled to a Viterbi decorder, for example, a sliding block Viterbi decoder (SBVD); and the FFE and/or the channel estimator for the Viterbi decoder are adapted using the LMS algorithm.

High-speed receiver architecture

A timing recovery system generates a sampling clock to synchronize sampling of a receiver to a symbol rate of an incoming signal. The input signal is received over an optical communication channel. The receiver generates a timing matrix representing coefficients of a timing tone detected in the input signal. The timing tone representing frequency and phase of a symbol clock of the input signal and has a non-zero timing tone energy. The receiver computes a rotation control signal based on the timing matrix that represents an amount of accumulated phase shift in the input signal relative to the sampling clock. A numerically controlled oscillator is controlled to adjust at least one of the phase and frequency of the sampling clock based on the rotation control signal.

Timing recovery for optical coherent receivers in the presence of polarization mode dispersion

A coherent receiver comprises an ingress signal path having an ingress line-side interface, and an ingress host-side interface. The ingress signal path is configured to receive an analog signal vector at the ingress line-side interface, to demodulate the analog signal vector, and to output a digital data signal Fat the ingress host-side interface. The coherent receiver also comprises clock and timing circuitry configured to receive a single reference clock signal and to provide a plurality of modified ingress path clock signals to different components of the ingress signal path, the plurality of modified ingress path clock signals derived from the single reference clock signal and the plurality of modified ingress path clock signals having different clock rates. The receiver, transmitter, or transceiver can operate in a plurality of programmable operating modes to accommodate different modulation/de-modulation schemes, error correction code schemes, framing/mapping protocols, or other programmable features.

Coherent transceiver architecture

Growing community of inventors

Irvine, CA, United States of America

Oscar Ernesto Agazzi