Title :
Use of an optical amplifier in a coherent receiver
Author :
Ryu, Shiro ; Horiuchi, Yukio
Author_Institution :
KDD R&D Labs., Saitama, Japan
fDate :
7/1/1991 12:00:00 AM
Abstract :
The application of an optical amplifier in a coherent receiver is examined theoretically and experimentally. It is shown that in a preamplifier application an optical amplifier with a low noise figure is effective for improving the performance of a receiver which operates in thermal-noise dominant condition. It is also made clear that in an enhanced local oscillator system (ELOS), in which a local oscillator light is amplified by an optical amplifier with high output power, the improvement of a common-mode rejection ratio (CMRR) of a balanced receiver leads the system performance to nearly shot-noise-limited operation.<>
Keywords :
fibre lasers; optical communication equipment; preamplifiers; receivers; semiconductor junction lasers; thermal noise; coherent receiver; common-mode rejection ratio; enhanced local oscillator system; fibre amplifier; high output power; low noise figure; nearly shot-noise-limited operation; optical amplifier; optical communication; performance; preamplifier application; semiconductor laser amplifier; thermal-noise dominant condition; High power amplifiers; Local oscillators; Low-noise amplifiers; Noise figure; Optical amplifiers; Optical noise; Optical receivers; Preamplifiers; Semiconductor optical amplifiers; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
