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1. (WO2018108008) HIGHER-LEVEL CLOCK AND DATA RECOVERY (CDR) IN PASSIVE OPTICAL NETWORKS (PONS)

Pub. No.:    WO/2018/108008    International Application No.:    PCT/CN2017/114818
Publication Date: Fri Jun 22 01:59:59 CEST 2018 International Filing Date: Thu Dec 07 00:59:59 CET 2017
IPC: H04B 10/40
Applicants: HUAWEI TECHNOLOGIES CO., LTD.
Inventors: YAO, Shuchang
ZHOU, Lei
TAO, Minghui
LIU, Xiang
EFFENBERGER, Frank
Title: HIGHER-LEVEL CLOCK AND DATA RECOVERY (CDR) IN PASSIVE OPTICAL NETWORKS (PONS)
Abstract:
An apparatus comprises : a CDR sub-system comprising : an FFE; a decision component coupled to the FFE; a subtractor coupled to the FFE and the decision component; and a tap weight updater coupled to the subtractor and the FFE; and a PR-MLSE component coupled to the CDR sub-system. A method comprises : converting an optical signal with a first modulation format to an analog electrical signal; converting the analog electrical signal to a first digital signal; equalizing the first digital signal into a second digital signal with a second modulation format, wherein the second modulation format has more levels than the first modulation format; and performing CDR on the second digital signal.