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1. (US20160013863) Apparatus for monitoring optical signal to noise ratio, transmitter and communication system

Office : United States of America
Application Number: 14794115 Application Date: 08.07.2015
Publication Number: 20160013863 Publication Date: 14.01.2016
Grant Number: 09698904 Grant Date: 04.07.2017
Publication Kind : B2
IPC:
H04B 17/00
H04B 10/079
H04B 10/077
H04J 14/06
H04B 10/556
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
17
Monitoring; Testing
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
10
Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
07
Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
075
using an in-service signal
079
using measurements of the data signal
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
10
Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
07
Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
075
using an in-service signal
077
using a supervisory or additional signal
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
J
MULTIPLEX COMMUNICATION
14
Optical multiplex systems
06
Polarisation multiplex systems
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
10
Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
50
Transmitters
516
Details of coding or modulation
548
Phase or frequency modulation
556
Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
Applicants: FUJITSU LIMITED
Inventors: Liang Dou
Zhenning Tao
Agents: Staas & Halsey LLP
Priority Data: 2014 1 0325415 09.07.2014 CN
Title: (EN) Apparatus for monitoring optical signal to noise ratio, transmitter and communication system
Abstract: front page image
(EN)

Embodiments provide an apparatus for monitoring an optical signal to noise ratio (OSNR), a transmitter and a communication system. The apparatus for monitoring optical signal to noise ratio includes: a signal extracting unit and a signal processing unit. The signal extracting unit is configured to extract pilot signals and non-pilot signals at two polarization states from received signals, frequencies of the pilot signals at the two polarization states being different, and the polarization states being differentiated by the frequencies of the pilot signals; and the signal processing unit is configured to obtain OSNRs at the two polarization states by using the pilot signals and the non-pilot signals extracted by the signal extracting unit. With the embodiments of the present disclosure, by making the frequencies of the pilot signals at different polarization states be different, OSNRs at different polarization states may be obtained more accurately.