Adaptive quantized feedback equalization of laser FM-response for optical FSK transmission

Author

Enning, B. ; Lange, G.

Author_Institution

Fachhochschule Flensburg, West Germany

Volume

2

Issue

11

fYear

1990

Firstpage

838

Lastpage

839

Abstract

Using a mathematical model for nonuniform FM-response DFB lasers, the authors calculated the influence of thermal and carrier-density effects on an adaptive quantized feedback equalization circuit (AQFE). A linear networks is introduced which allows the calculation of an equivalent overall system bandwidth. The equalizer circuit is tolerant to dip frequency variations f/sub min/ of the laser´s frequency response from 0 to >10 MHz and amplitude variations A between 0.1 and 0.5 for f>>f/sub min/. Hence, lasers can be equalized independent of their individual FM-response. It is calculated that an equivalent bandwidth f/sub c/ of more than 1 GHz can achieved.<>

Keywords

distributed feedback lasers; feedback; frequency shift keying; optical communication equipment; adaptive quantized feedback equalization circuit; amplitude variations; carrier-density effects; dip frequency variations; equivalent bandwidth; equivalent overall system bandwidth; laser frequency modulation response; linear networks; mathematical model; optical frequency shift keying; Adaptive equalizers; Adaptive optics; Bandwidth; Circuits; Frequency response; Frequency shift keying; Laser feedback; Laser modes; Laser noise; Optical feedback;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.63239

Filename

63239