In-line optical phase-sensitive amplifier with pump light source controlled by optical phase-lock loop

Author

Imajuku, Wataru ; Takada, Atsushi

Author_Institution

NTT Opt. Network Syst. Labs., Kanagawa, Japan

Volume

17

Issue

4

fYear

1999

fDate

4/1/1999 12:00:00 AM

Firstpage

637

Lastpage

646

Abstract

This paper describes an in-line optical phase-sensitive amplifier (PSA) with a pump laser whose optical phase is locked to that of a randomly modulated signal by using an optical phase-lock loop (OPLL). The OPLL is designed with the capability of optical phase locking at an arbitrary relative phase. Experimental evaluation is presented of the OPLL employing a newly developed external cavity semiconductor ring laser with a spectrum linewidth of less than 20 kHz. Employing this pump laser with the OPLL in conjunction with a 4.4-km long nonlinear fiber Sagnac interferometer (NFSI) yields optical phase-sensitive gain of up to 11 dB. A randomly modulated signal is successfully amplified and confirmed offering a clear eye-opening

Keywords

fibre optic sensors; laser cavity resonators; light interferometers; light sources; optical communication equipment; optical phase locked loops; optical pumping; ring lasers; semiconductor optical amplifiers; sensitivity; 11 dB; 4.4 km; arbitrary relative phase; clear eye-opening; external cavity semiconductor ring laser; in-line optical phase-sensitive amplifier; nonlinear fiber Sagnac interferometer; optical phase locking; optical phase-lock loop; optical phase-sensitive gain; pump laser; pump light source control; randomly modulated signal; spectrum linewidth; Fiber nonlinear optics; Light sources; Nonlinear optics; Optical amplifiers; Optical interferometry; Optical modulation; Optical pumping; Pump lasers; Semiconductor optical amplifiers; Stimulated emission;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.754794

Filename

754794