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1. (CN104283609) Direct detection method and system based on two-channel orthogonal pilot frequency optical signals and device

Office : China
Application Number: 201410582572.5 Application Date: 27.10.2014
Publication Number: 104283609 Publication Date: 14.01.2015
Publication Kind : A
IPC:
H04B 10/07
H04J 14/02
H04B 10/2513
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
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
J
MULTIPLEX COMMUNICATION
14
Optical multiplex systems
02
Wavelength-division 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
25
Arrangements specific to fibre transmission
2507
for the reduction or elimination of distortion or dispersion
2513
due to chromatic dispersion
CPC:
H04B 10/516
H04B 10/2513
H04J 11/00
Applicants: WUHAN RESEARCH INSTITUTE OF POST AND TELECOMMUNICATION
Inventors: HU RONG
YANG QI
YU SHAOHUA
Agents: wei dianshen pang bingliang
Priority Data:
Title: (EN) Direct detection method and system based on two-channel orthogonal pilot frequency optical signals and device
(ZH) 基于双通道正交导频光信号的直接检测方法、系统及装置
Abstract: front page image
(EN) The invention discloses a direct detection method and system based on two-channel orthogonal pilot frequency optical signals and a device, and relates to the field of optical signal modulation and direct detection. The method comprises the following steps that a transmitting terminal modulates plural modulation signals to two paths of optical carriers, and two paths of optical signals are generated; the first optical carrier and the second optical carrier with 90-degree phase shift are coupled, the first optical carrier is first optical pilot frequency, and the second optical carrier with the 90-degree phase shift is second optical pilot frequency; the two paths of optical signals are coupled with the two paths of optical pilot frequency respectively, and the two-channel orthogonal pilot frequency optical signals are generated and sent; a receiving terminal carries out wavelength division demultiplexing on the received signals, two paths of received signal are obtained and are detected by two photoelectric detectors, signal restoration is carried out through a digital signal processing algorithm, and complete signal amplitude and phase information is obtained. The amplitude and phase information of the transmitted signals can be detected at the same time, and the transmission distance larger than 100 kilometers is achieved.
(ZH)

本发明公开了一种基于双通道正交导频光信号的直接检测方法、系统及装置,涉及光信号调制与直接检测领域,该方法包括以下步骤:发射端将复数形式的调制信号调制到两路光载波上,生成两路光信号;将第一光载波和移相90度的第二光载波耦合,其中的第一光载波为第一光导频,移相90度的第二光载波为第二光导频;将两路光信号分别与两路光导频耦合,生成双通道正交导频光信号并发送;接收端对接收的信号进行波分解复用,得到两路接收信号,经两个光电探测器检测,通过数字信号处理算法进行信号恢复,得到完整的信号幅度和相位信息。本发明能同时检测出传输信号的幅度和相位信息,实现大于100公里的传输距离。