Title :
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
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;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2005.853127
