公开(公告)号：US09712253B1

公开(公告)日：2017-07-18

申请号：US14869676

申请日：2015-09-29

Applicant: Inphi Corporation

Inventor： Mario Rafael Hueda ,  Mauro M. Bruni ,  Federico Nicolas Paredes ,  Hugo Santiago Carrer ,  Diego Ernesto Crivelli ,  Oscar Ernesto Agazzi ,  Norman L. Swenson ,  Seyedmohammadreza Motaghiannezam

IPC: H04B10/00 ,  H04B10/61 ,  H04L7/00

CPC classification number: H04B10/6162 ,  H04B10/616 ,  H04B10/6165 ,  H04L7/0075 ,  H04L7/0079

Abstract: 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.

公开(公告)号：US10727874B2

公开(公告)日：2020-07-28

申请号：US16041642

申请日：2018-07-20

Applicant: INPHI CORPORATION

Inventor： Damian Alfonso Morero ,  Mario Alejandro Castrillon ,  Matias German Schnidrig ,  Mario Rafael Hueda

IPC: H03M13/00 ,  H03M13/11

Abstract: 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.

公开(公告)号：US10608749B1

公开(公告)日：2020-03-31

申请号：US16256971

申请日：2019-01-24

Applicant: INPHI CORPORATION

Inventor： Damian Alfonso Morero ,  Mario Alejandro Castrillon ,  Ramiro Rogelio Lopez ,  Cristian Cavenio ,  Gabriel Infante ,  Mario Rafael Hueda

IPC: H04B10/00 ,  H04B10/61 ,  H04L27/227 ,  H04L27/38

Abstract: 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.

公开(公告)号：US10530492B2

公开(公告)日：2020-01-07

申请号：US16151094

申请日：2018-10-03

Applicant: INPHI CORPORATION

Inventor： Damián Alfonso Morero ,  Mario Rafael Hueda ,  Oscar Ernesto Agazzi

IPC: H04B10/61 ,  H04B10/079 ,  H04L1/00 ,  H04L7/00 ,  H04L25/03 ,  H04L27/26 ,  H04B10/40

Abstract: 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.

公开(公告)号：US10341030B2

公开(公告)日：2019-07-02

申请号：US15714990

申请日：2017-09-25

Applicant: INPHI CORPORATION

Inventor： Mario Alejandro Castrillon ,  Damian Alfonso Morero ,  Mario Rafael Hueda

IPC: H04B10/61 ,  H04L1/00 ,  H04L7/033

Abstract: 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.

公开(公告)号：US10181908B2

公开(公告)日：2019-01-15

申请号：US15839698

申请日：2017-12-12

Applicant: INPHI CORPORATION

Inventor： Mario Rafael Hueda ,  Mauro Marcelo Bruni ,  Federico Nicolas Paredes ,  Hugo Santiago Carrer ,  Diego Ernesto Crivelli ,  Oscar Ernesto Agazzi ,  Norman L. Swenson ,  Seyedmohammadreza Motaghiannezam

IPC: H04B10/00 ,  H04B10/61 ,  H04L7/00

Abstract: 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.

公开(公告)号：US10181899B2

公开(公告)日：2019-01-15

申请号：US16024105

申请日：2018-06-29

Applicant: INPHI CORPORATION

Inventor： Shu Hao Fan ,  Damian Alfonso Morero ,  Mario Rafael Hueda

IPC: H04B10/08 ,  H04B10/079 ,  H04L25/03 ,  H04B10/40 ,  H04B10/61 ,  H04B10/50

Abstract: 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.

公开(公告)号：US20180302168A1

公开(公告)日：2018-10-18

申请号：US16011470

申请日：2018-06-18

Applicant: INPHI CORPORATION

Inventor： Damian Alfonso Morero ,  Martin Carlos Asinari ,  Martin Ignacio Del Barco ,  Mario Rafael Hueda ,  Lucas Javier Yoaquino

IPC: H04B10/61 ,  H04L25/06

CPC classification number: H04B10/616 ,  H04L25/067

Abstract: An adaptive demapper adaptively demaps an input symbol. An input symbol is received and demapped in a hard-output demapper to generate a current detected symbol corresponding to a constellation point on a current constellation closest to the input symbol. A corrected inverse of a current noise power estimate is determined by updating a previous noise power estimate based on a difference between the input symbol and the current detected symbol. In a soft-output demapper, a log likelihood ratio corresponding to the current detected symbol is determined based on the corrected inverse of the current noise power estimate. The constellation point in the current constellation corresponding to the current detected symbol is then updated to generate an updated constellation based on a difference between the constellation point and the received input symbol.

公开(公告)号：US09960855B2

公开(公告)日：2018-05-01

申请号：US15786108

申请日：2017-10-17

Applicant: INPHI CORPORATION

Inventor： Oscar Ernesto Agazzi ,  Diego Ernesto Crivelli ,  Hugo Santiago Carrer ,  Mario Rafael Hueda ,  Martin Ignacio Del Barco ,  Pablo Gianni ,  Ariel Pola ,  Elvio Adrian Serrano ,  Alfredo Javier Taddei ,  Mario Alejandro Castrillon ,  Martin Serra ,  Ramiro Matteoda

IPC: H04B10/00 ,  H04B10/61 ,  H04L27/01 ,  H04L7/00 ,  H04J14/00

CPC classification number: H04B10/6161 ,  H04B10/616 ,  H04L7/0075 ,  H04L27/01

Abstract: A receiver for fiber optic communications.

公开(公告)号：US09882648B2

公开(公告)日：2018-01-30

申请号：US15387246

申请日：2016-12-21

Applicant: INPHI Corporation

Inventor： Oscar Ernesto Agazzi ,  Diego Ernesto Crivelli ,  Hugo Santiago Carrer ,  Mario Rafael Hueda ,  German Cesar Augusto Luna ,  Carl Grace

IPC: H04B1/38 ,  H04L5/16 ,  H04B10/50 ,  H04B10/69 ,  H03M13/41 ,  H04L25/02 ,  H04B10/2507 ,  H04B10/294 ,  H04B3/23 ,  H04B7/005 ,  H04B1/04

CPC classification number: H04B10/5059 ,  H03M13/41 ,  H04B1/38 ,  H04B3/235 ,  H04B7/005 ,  H04B7/0456 ,  H04B10/25073 ,  H04B10/2941 ,  H04B10/40 ,  H04B10/6971 ,  H04B2001/0441 ,  H04B2201/709772 ,  H04L5/16 ,  H04L25/0202 ,  H04L25/025 ,  H04L25/03038 ,  H04L25/03057 ,  H04L2025/03477 ,  H04L2025/03617

Abstract: 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 decoder, 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.