Analysis of the effect of thermal chirp on interferometric homodyne and heterodyne crosstalk in optical communication systems employing directly Modulated DFB lasers

Author

Rotem, Efraim ; Sadot, Dan

Author_Institution

Electr. & Comput. Eng. Dept., Ben Gurion Univ., Beer-Sheva, Israel

Volume

23

Issue

9

fYear

2005

Firstpage

2662

Lastpage

2672

Abstract

A closed-form expression is derived for the probability density function (pdf) of the beat noise created by homodyne and heterodyne interferometric crosstalk in optical communication systems employing directly modulated distributed feedback lasers at bit rates between 155 Mb/s and 2.5 Gb/s. Thermal chirp is shown to be the predominant chirp mechanism affecting homodyne-crosstalk-induced penalty at bit rates up to 2.5 Gb/s. Theoretical calculations of the crosstalk-induced power penalty are verified experimentally.

Keywords

chirp modulation; distributed feedback lasers; heterodyne detection; homodyne detection; light interferometry; optical communication equipment; optical crosstalk; optical fibre communication; optical modulation; probability; thermo-optical effects; 0.155 to 2.5 Gbit/s; DFB lasers; beat noise; bit rate; closed-form expression; directly modulated lasers; heterodyne crosstalk; homodyne crosstalk; interferometric crosstalk; interferometric homodyne; optical communication systems; power penalty; probability density function; thermal chirp; Bit rate; Chirp modulation; Closed-form solution; Crosstalk; Distributed feedback devices; Laser feedback; Laser noise; Optical fiber communication; Optical interferometry; Probability density function; Distributed feedback lasers; error analysis; laser chirp; optical communication; optical crosstalk; optical fiber interference; optical modulation; optical noise; power penalties; semiconductor lasers;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2005.853127

Filename

1506842