Inphi Corporation

Clariphy Communications, Inc.

Marvell Asia Pte., Ltd.

Damian Alfonso Morero

Mario Rafael Hueda

Mario Alejandro Castrillon

Matias German Schnidrig

Ramiro Rogelio Lopez

Martin Ignacio Del Barco

Martin Carlos Asinari

Facundo Abel Alcides Ramos

Oscar Ernesto Agazzi

Diego Ernesto Crivelli

Hugo Santiago Carrer

Norman L Swenson

Vadim Gutnik

Paul Voois

Jorge Manuel Finochietto

Alfredo Javier Taddei

Mauro Marcelo Bruni

Federico Nicolas Paredes

Elvio Adrian Serrano

Gabriel Infante

Pablo Gustavo Quiroga

Roman Antonio Arenas

Alejandro Javier Schwoykoski

Cristian Cavenio

Adrián Ulises Morales

Shu Hao Fan

María Laura Ferster

José L Correa Lust

Mario Alejandro Castrillion

Lucas Javier Yoaquino

Laura Maria Ferster

Teodoro Ariel Goette

Maria Laura Ferster

Franco Paludi

Ulises Morales

A decoder for a receiver in a communication system includes an interface configured to receive encoded input data via a communication channel. The encoded input data includes forward error correction (FEC) codewords. A processor is configured to decode the FEC codewords using low density parity check (LDPC) codes defined by a parity check matrix. The parity check matrix is defined by both regular column partition (RCP) constraints and quasi-cyclic (QC) constraints. An output circuit is configured to output a decoded codeword based on the FEC codewords decoded by the processor.

Decoding FEC codewords using LDPC codes defined by a parity check matrix which is defined by RPC and QC constraints

A method and structure for probabilistic shaping and compensation techniques in coherent optical receivers. According to an example, the present invention provides a method and structure for an implementation of distribution matcher encoders and decoders for probabilistic shaping applications. The techniques involved avoid the traditional implementations based on arithmetic coding, which requires intensive multiplication functions. Furthermore, these probabilistic shaping techniques can be used in combination with LDPC codes through reverse concatenation techniques.

Probabilistic shaping techniques for high performance coherent optical transceivers

A communication system includes a transmitter having an encoder configured to encode input data using FEC codewords and a receiver including a decoder configured to decode the FEC codewords using a parity check matrix. The decoder includes check node processing units each configured to perform a check node computation on an FEC codeword using a different row of the parity check matrix. Each of the check node processing units includes an input computation stage configured to compute initial computation values, a pipelined message memory configured to shift the initial computation values at a predefined clock interval, an output computation stage configured to generate a plurality of check node output messages, a plurality of variable node processing units each configured to perform variable node update computations to generate the variable node messages, and an output circuit configured to generate a decoded codeword based on the variable node messages.

Non-concatenated FEC codes for ultra-high speed optical transport networks

A method and structure for compensation techniques in coherent optical receivers. The present invention provides a coherent optical receiver with an improved 8&#xd7;8 adaptive MIMO (Multiple Input, Multiple Output) equalizer configured within a digital signal processor (DSP) to compensate the effects of transmitter I/Q skew in subcarrier multiplexing (SCM) schemes. The 8&#xd7;8 MIMO equalizer can be configured such that each of the 8 outputs is electrically coupled to 3 of 8 inputs, wherein each of the input-output couplings is configured as a filter. The method includes compensating for impairments to the digital conversion of an optical input signal via the 8&#xd7;8 MIMO equalizer following other signal processing steps, such as chromatic dispersion (CD)/polarization-mode dispersion (PMD) compensation, carrier recovery, timing synchronization, and cycle slip correction.

Impairment compensation techniques for high performance coherent optical transceivers

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

A decoder performs forward error correction based on quasi-cyclic regular column-partition low density parity check codes. A method for designing the parity check matrix reduces the number of short-cycles of the matrix to increase performance. An adaptive quantization post-processing technique further improves performance by eliminating error floors associated with the decoding. A parallel decoder architecture performs iterative decoding using a parallel pipelined architecture.

A receiver architecture and method recovers data received over an optical fiber channel in the presence of cycle slips. In a first cycle slip recovery architecture, a receiver detects and corrects cycle slips based on pilot symbols inserted in the transmitted data. In a second cycle slip recovery architecture, a coarse cycle slip detection is performed based on pilot symbols and a cycle slip position estimation is then performed based on carrier phase noise. The receiver compensates for cycle slips based on the position estimation.

Cycle slip compensation in a coherent receiver

Apparatus and method for transmitter alignment in an optical communication system are provided. In certain configurations, a method of correcting for transmitter skew is provided. The method includes generating an optical signal using a transmitter based on an in-phase (I) component and a quadrature-phase (Q) component of a transmit signal, the optical signal having a baud rate that is based on a timing tone. The method further includes receiving the optical signal as an input to a receiver, and generating a signal vector representing the optical signal using the receiver. The signal vector includes an I component and a Q component. The method further includes calculating a power of the timing tone based on processing the signal vector using a tone power calculator of the receiver, and correcting for a skew of the transmitter based on the calculated power.

Apparatus and methods for timing tone based transmitter skew alignment in an optical communication system

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Cordoba, Argentina

Damian Alfonso Morero