Title :
Inline coherent optical amplifier with noise figure lower than 3 dB quantum limit
Author :
Imajuku, W. ; Takada, A. ; Yamabayashi, Y.
Author_Institution :
NTT Network Innovation Labs., Kanagawa, Japan
fDate :
1/6/2000 12:00:00 AM
Abstract :
The first demonstration of an inline coherent optical amplifier with a noise figure which is lower than the 3 dB quantum limit is presented. The amplifier is based on optical phase-sensitive amplification using a nonlinear fibre Sagnac interferometer pumped by an injection-locked semiconductor laser with a compensation phase-locked loop. A noise figure of 2.0 dB with a high signal gain of 16 dB has been successfully obtained
Keywords :
fibre optic sensors; laser mode locking; laser noise; light coherence; light interferometers; semiconductor device noise; semiconductor optical amplifiers; compensation phase-locked loop; dB quantum limit; injection-locked semiconductor laser; inline coherent optical amplifier; noise figure; nonlinear fibre Sagnac interferometer; optical phase-sensitive amplification; quantum limit;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20000032
