A new method for low noise automatic gain control of EDFAs for WDM systems in metropolitan networks

Author

Hashimoto, Mamoru ; Sawada, Hisashi ; Yoshida, Minoru ; Imada, Yoshiyuki

Author_Institution

Mitsubishi Cable Industries, Ltd., Hyogo, Japan

Volume

2

fYear

2001

fDate

2001

Firstpage

174

Abstract

We propose a new hybrid automatic gain controlled (HAGC) EDFA which has electrical and optical feedback. The conventional optical automatic gain clamped (OAGC EDFA) has higher noise figure (NF) than the normal EDFA for its optical feedback. However the HAGC EDFA has low NF equal to the normal EDFA by the new feedback method (electrical and optical hybrid) which maintains the state just before oscillation in the optical loop. The HAGC EDFA has equal temporal response characteristics. Additionally the HAGC EDFA has lower power consumption than the OAGC EDFA by virtue of the low pump laser power, controlled by the electrical feedback.

Keywords

automatic gain control; erbium; laser feedback; metropolitan area networks; optical communication equipment; optical control; optical fibre amplifiers; optical fibre networks; optical pumping; telecommunication control; wavelength division multiplexing; EDFA; HAGC; WDM systems; electrical feedback; hybrid automatic gain control; low noise automatic gain control; low pump laser power; metropolitan networks; noise figure; optical feedback; optical loop; oscillation; power consumption; temporal response characteristics; Automatic control; Erbium-doped fiber amplifier; Gain control; Laser feedback; Noise measurement; Optical control; Optical feedback; Optical noise; Optical pumping; Wavelength division multiplexing;

fLanguage

English

Publisher

ieee

Conference_Titel

Optical Communication, 2001. ECOC '01. 27th European Conference on

Print_ISBN

0-7803-6705-7

Type

conf

DOI

10.1109/ECOC.2001.988870

Filename

988870