公开(公告)号：US20210075516A1

公开(公告)日：2021-03-11

申请号：US16951653

申请日：2020-11-18

Applicant: INPHI CORPORATION

Inventor： Benjamin P. SMITH ,  Jamal RIANI ,  Sudeep BHOJA ,  Arash FARHOODFAR ,  Vipul BHATT

IPC: H04B10/58 ,  H04B10/2507 ,  H04B10/69 ,  H04B10/54 ,  H04B10/516 ,  H04B10/00

Abstract: A circuit and method for mitigating multi-path interference in direct detection optical systems is provided. Samples of an optical signal having a pulse amplitude modulated (PAM) E-field are processed by generating a PAM level for each sample. For each sample, the sample is subtracted from the respective PAM level to generate a corresponding error sample. The error samples are lowpass filtered to produce estimates of multi-path interference (MPI). For each sample, one of the estimates of MPI is combined with the sample to produce an interference-mitigated sample.

公开(公告)号：US20200186256A1

公开(公告)日：2020-06-11

申请号：US16790463

申请日：2020-02-13

Applicant: INPHI CORPORATION

Inventor： Benjamin P. SMITH ,  Jamal RIANI ,  Sudeep BHOJA ,  Arash FARHOODFAR ,  Vipul BHATT

IPC: H04B10/58 ,  H04B10/00 ,  H04B10/516 ,  H04B10/69 ,  H04B10/54 ,  H04B10/2507

Abstract: A circuit and method for mitigating multi-path interference in direct detection optical systems is provided. Samples of an optical signal having a pulse amplitude modulated (PAM) E-field are processed by generating a PAM level for each sample. For each sample, the sample is subtracted from the respective PAM level to generate a corresponding error sample. The error samples are lowpass filtered to produce estimates of multi-path interference (MPI). For each sample, one of the estimates of MPI is combined with the sample to produce an interference-mitigated sample.

公开(公告)号：US20200244394A1

公开(公告)日：2020-07-30

申请号：US16853514

申请日：2020-04-20

Applicant: INPHI CORPORATION

Inventor： Benjamin P. SMITH ,  Arash FARHOODFAR

IPC: H04L1/00 ,  H04B10/50 ,  H04B10/516 ,  H04B10/54 ,  H03M13/29 ,  H04B10/532 ,  H04B10/69

Abstract: An optical module processes first FEC (Forward Error Correction) encoded data produced by a first FEC encoder. The optical module has a second FEC encoder for further coding a subset of the first FEC encoded data to produce second FEC encoded data. The optical module also has an optical modulator for modulating, based on a combination of the second FEC encoded data and a remaining portion of the first FEC encoded data that is not further coded, an optical signal for transmission over an optical channel. The second FEC encoder is an encoder for an FEC code that has a bit-level trellis representation with a number of states in any section of the bit-level trellis representation being less than or equal to 64 states. In this manner, the second FEC encoder has relatively low complexity (e.g. relatively low transistor count) that can reduce power consumption for the optical module.

公开(公告)号：US20190305884A1

公开(公告)日：2019-10-03

申请号：US16444421

申请日：2019-06-18

Applicant: INPHI CORPORATION

Inventor： Benjamin P. SMITH ,  Jamal RIANI ,  Arash FARHOODFAR ,  Sudeep BHOJA

IPC: H04L1/00 ,  H03M13/29 ,  H03M13/19 ,  H03M13/25

Abstract: The present invention relates to data communication systems and methods thereof. More specifically, embodiments of the present invention provide a data transmission method. Data are encoded with staircase encoder, and staircase coded blocks are first interleaved then combined into outer code frames. Code frames additionally include sync words and padding bits. A second interleaving is applied to the bits of the code frames, and Hamming encoding is performed on the output of the second interleaver. Hamming codewords are Gray-mapped to dual-polarized quadrature-amplitude-modulation (DP-QAM) symbols, and a third interleaving of the symbols from a set of successive Hamming codewords is performed. Pilot symbols are inserted periodically into the stream of DP-QAM symbols. There are other embodiments as well.

公开(公告)号：US20210336761A1

公开(公告)日：2021-10-28

申请号：US16860403

申请日：2020-04-28

Applicant: INPHI CORPORATION

Inventor： Benjamin P. SMITH ,  Jamal RIANI

IPC: H04L7/00 ,  H04L1/20

Abstract: The present invention is directed to circuits and communication. More specifically, a specific embodiment of the present invention provides a timing recovery device with two stages. The first stage generates a clock signal to sample the received waveform, and the second stage provides timing-jitter mitigation. The second stage includes a jitter mitigation circuit with coefficients a function of the instantaneous jitter estimate, in addition to a jitter estimation tracking loop consisting of an error generator, a timing error detector and a loop filter to compensate for timing jitter associated with the clock signal. There are other embodiments as well.

公开(公告)号：US20210306009A1

公开(公告)日：2021-09-30

申请号：US17347315

申请日：2021-06-14

Applicant: INPHI CORPORATION

Inventor： Jamal RIANI ,  Farshid RAD ,  Benjamin P. SMITH ,  Yu LIAO ,  Sudeep BHOJA

IPC: H03M13/39 ,  H04L1/00

Abstract: The present invention is directed to data communication. More specifically, an embodiment of the present invention provides an error correction system. Input data signals are processed by a feedforward equalization module and a decision feedback back equalization module. Decisions generated by the decision feedback equalization module are processed by an error detection module, which determines error events associated with the decisions. The error detection module implements a reduced state trellis path. There are other embodiments as well.

公开(公告)号：US20190158189A1

公开(公告)日：2019-05-23

申请号：US16259760

申请日：2019-01-28

Applicant: INPHI CORPORATION

Inventor： Benjamin P. SMITH ,  Jamal RIANI ,  Sudeep BHOJA ,  Arash FARHOODFAR ,  Vipul BHATT

IPC: H04B10/58 ,  H04B10/2507 ,  H04B10/69 ,  H04B10/516 ,  H04B10/54

Abstract: A circuit and method for mitigating multi-path interference in direct detection optical systems is provided. Samples of an optical signal having a pulse amplitude modulated (PAM) E-field are processed by generating a PAM level for each sample. For each sample, the sample is subtracted from the respective PAM level to generate a corresponding error sample. The error samples are lowpass filtered to produce estimates of multi-path interference (MPI). For each sample, one of the estimates of MPI is combined with the sample to produce an interference-mitigated sample.

公开(公告)号：US20190044653A1

公开(公告)日：2019-02-07

申请号：US16155610

申请日：2018-10-09

Applicant: INPHI CORPORATION

Inventor： Benjamin P. SMITH ,  Arash FARHOODFAR

IPC: H04L1/00 ,  H03M13/29 ,  H04B10/54 ,  H04B10/532 ,  H04B10/516 ,  H04B10/50 ,  H04B10/69

CPC classification number: H04L1/0044 ,  H03M13/2906 ,  H04B10/50 ,  H04B10/516 ,  H04B10/5161 ,  H04B10/532 ,  H04B10/541 ,  H04B10/697 ,  H04L1/0041 ,  H04L1/0045 ,  H04L1/0058 ,  H04L1/006 ,  H04L1/0065

Abstract: An optical module processes first FEC (Forward Error Correction) encoded data produced by a first FEC encoder. The optical module has a second FEC encoder for further coding a subset of the first FEC encoded data to produce second FEC encoded data. The optical module also has an optical modulator for modulating, based on a combination of the second FEC encoded data and a remaining portion of the first FEC encoded data that is not further coded, an optical signal for transmission over an optical channel. The second FEC encoder is an encoder for an FEC code that has a bit-level trellis representation with a number of states in any section of the bit-level trellis representation being less than or equal to 64 states. In this manner, the second FEC encoder has relatively low complexity (e.g. relatively low transistor count) that can reduce power consumption for the optical module.

公开(公告)号：US20190020356A1

公开(公告)日：2019-01-17

申请号：US16134311

申请日：2018-09-18

Applicant: INPHI CORPORATION

Inventor： Arash FARHOODFAR ,  Frank R. KSCHISCHANG ,  Benjamin P. SMITH ,  Andrew HUNT

IPC: H03M13/27 ,  H04L1/00 ,  H03M13/00

CPC classification number: H03M13/2778 ,  H03M13/2707 ,  H03M13/271 ,  H03M13/2742 ,  H03M13/2757 ,  H03M13/2767 ,  H03M13/2782 ,  H03M13/6502 ,  H04L1/0071

Abstract: Multiple data permutation operations in respective different dimensions are used to provide an overall effective data permutation using smaller blocks of data in each permutation than would be used in directly implementing the overall permutation in a single permutation operation. Data that has been permuted in one permutation operation is block interleaved, and the interleaved data is then permuted in a subsequent permutation operation. A matrix transpose is one example of block interleaving that could be applied between permutation operations.

公开(公告)号：US20210111833A1

公开(公告)日：2021-04-15

申请号：US17127510

申请日：2020-12-18

Applicant: INPHI CORPORATION

Inventor： Benjamin P. SMITH ,  Arash FARHOODFAR

IPC: H04L1/00 ,  H04B10/50 ,  H04B10/516 ,  H04B10/54 ,  H03M13/29 ,  H04B10/532 ,  H04B10/69

Abstract: An optical module processes first FEC (Forward Error Correction) encoded data produced by a first FEC encoder. The optical module has a second FEC encoder for further coding a subset of the first FEC encoded data to produce second FEC encoded data. The optical module also has an optical modulator for modulating, based on a combination of the second FEC encoded data and a remaining portion of the first FEC encoded data that is not further coded, an optical signal for transmission over an optical channel. The second FEC encoder is an encoder for an FEC code that has a bit-level trellis representation with a number of states in any section of the bit-level trellis representation being less than or equal to 64 states. In this manner, the second FEC encoder has relatively low complexity (e.g. relatively low transistor count) that can reduce power consumption for the optical module.