Title:
OPTICAL AMPLIFIER
Document Type and Number:
Japanese Patent JP3545977
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To realize low noise optical amplification in a phase sensitive optical amplifier by a homodyne optical PLL system.
SOLUTION: An optical amplifier provided with an exciting light source, a phase sensitive optical amplifier receiving signal light and exciting light, and an exciting light phase control means for synchronizing an optical phase of the exciting light with that of the signal light, comprises a signal light polarization control means for converting the signal light into linearly polarized light and inputting it to the phase sensitive optical amplifier, and an exciting light polarization control means for converting the exciting light into elliptically polarized light and inputting it to the phase sensitive optical amplifier, and the exciting light phase control means comprises a polarized light demultiplexing means for demultiplexing a specific polarized component from two multiplexed light obtained by multiplexing the signal light and the exciting light, a phase error detecting means for detecting an optical phase error between the signal light and the exciting light by balanced detection of a specific polarized component demultiplexed from the two multiplexed light, and a filter means for filtering the error signal outputted from the phase error detecting means and feeding it back to the exciting light source.
Inventors:
Imajuku
Atsushi Takada
Atsushi Takada
Application Number:
JP30948099A
Publication Date:
July 21, 2004
Filing Date:
October 29, 1999
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G02F1/365; G02F1/39; G02F2/00; (IPC1-7): G02F1/365; G02F1/39; G02F2/00
Domestic Patent References:
| JP11133472A | ||||
| JP5289138A | ||||
| JP8334800A | ||||
| JP8136959A | ||||
| JP9222622A | ||||
| JP11004036A | ||||
| JP11211572A | ||||
| JP11101694A |
Other References:
今宿亙他,位相感応型光増幅器を用いた多中継伝送特性の理論検討,電子情報通信学会技術研究報告,日本,社団法人 電子情報通信学会,1996年 5月23日,Vol.96 No.59,p29-36
Atushi Takada etal,Amplitude noise suppression by using high-gain phase-sensitive amplifier as limiting amlifier,Opt Fiber Commun Conf,1996年,19th,p94-95
Atushi Takada etal,Amplitude noise suppression by using high-gain phase-sensitive amplifier as limiting amlifier,Opt Fiber Commun Conf,1996年,19th,p94-95
Attorney, Agent or Firm:
Furuya Fumio