High-gain polarization-insensitive optical amplifier

Author

Koga, Masafumi ; Matsumoto, Takao

Author_Institution

NTT Transmission Syst. Labs., Kanagawa, Japan

Volume

9

Issue

2

fYear

1991

fDate

2/1/1991 12:00:00 AM

Firstpage

284

Lastpage

290

Abstract

A polarization-insensitive optical amplifier (PIOA) consisting of two serial semiconductor laser amplifiers (SLAs) is studied theoretically and experimentally. A polarization-insensitive isolator (PII) inserted between the two SLAs serves not only to eliminate the coupling cavity, but also to rotate any polarized forward light by 90°. Experimental results show a maximum fiber-to-fiber gain of 29 dB. PIOA gain deviation for the input polarization launch angle is just 0.6 dB compared to an original value of 5-6 dB in a single SLA. A theoretical analysis shows that it is necessary to achieve a PII rotation design error of less than 0.5° in order to suppress deviation below 0.1 dB. PIOA noise figure deviation, for the input signal polarization launch angle, was only 0.1 dB from both the experimental and theoretical results even though there was a rotation error of 2°

Keywords

light polarisation; measurement errors; optical communication equipment; optical isolators; optical rotation; semiconductor junction lasers; 29 dB; gain deviation; input polarization launch angle; maximum fiber-to-fiber gain; noise figure deviation; polarization-insensitive isolator; polarization-insensitive optical amplifier; rotated polarised light; rotation design error; Fiber lasers; Gain; Isolators; Laser theory; Optical amplifiers; Optical fiber polarization; Optical polarization; Semiconductor lasers; Semiconductor optical amplifiers; Stimulated emission;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.65887

Filename

65887