公开(公告)号：US20170230119A1

公开(公告)日：2017-08-10

申请号：US15040812

申请日：2016-02-10

Applicant: INPHI CORPORATION

Inventor： Benjamin P. Smith ,  Jamal Riani ,  Sudeep Bhoja ,  Arash Farhoodfar ,  Vipul Bhatt

IPC: H04B10/58 ,  H04B10/516

CPC classification number: H04B10/58 ,  H04B10/00 ,  H04B10/2507 ,  H04B10/5161 ,  H04B10/6971

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：US09660841B2

公开(公告)日：2017-05-23

申请号：US15260692

申请日：2016-09-09

Applicant: INPHI CORPORATION

Inventor： Stephane Dallaire ,  Benjamin P. Smith ,  Travis William Lovitt ,  Arash Farhoodfar

IPC: H03K9/00 ,  H04L27/01 ,  H03H7/30 ,  H04L25/03 ,  H04L25/06 ,  H04B1/10 ,  H04L12/26

CPC classification number: H04L25/03019 ,  H04B1/10 ,  H04L25/03057 ,  H04L25/061 ,  H04L43/028 ,  H04L2025/03363 ,  H04Q2213/03

Abstract: Receiver circuitry is disclosed that can take circuit branches offline to possibly adapt an offset value. In one embodiment, a circuit in a receiver has at least two branches. Each branch includes an adjustor to adjust the branch signal by an offset value. Selection circuitry takes one of the branches offline by selecting the output of that branch as an offline value, and by selecting the output of one or more of the other branches as a data decision value. The selection circuitry changes which branch is taken offline during the operation of the circuit. When a branch is taken offline, an offset value associated with that branch may be updated, if necessary.