Performance of linecoded optical heterodyne FSK systems with nonuniform laser FM response

Author

Majumder, S.P. ; Gangopadhyay, R. ; Alam, M.S. ; Prati, G.

Author_Institution

Dept. of Electr. & Electron. Eng., Bangladesh Univ. of Eng. & Technol., Dhaka, Bangladesh

Volume

13

Issue

4

fYear

1995

fDate

4/1/1995 12:00:00 AM

Firstpage

628

Lastpage

638

Abstract

A simple theoretical analysis for evaluating the performance of linecoded optical frequency shift keying (FSK) systems is presented. It accounts for the combined effects of laser phase noise, receiver noise, and nonuniform BM response of distributed feedback lasers. A close form expression for the random frequency noise due to the combined effect of laser nonuniform FM response and phase noise is developed. The analysis is carried out for three different linecoding schemes, i.e., alternate mark inversion, Miller code or delay modulation, and Manchester coding, to investigate the efficacy of the line coding schemes in counteracting the effect of nonflat FM response. Theoretical and simulation results show that the sensitivities of linecoded FSK systems are within 0.7 and 0.4 dB for single-branch and dual-branch detection, respectively, at a bit error probability of 10^-9 relative to the random non-return to zero FSK with flat FM response

Keywords

distributed feedback lasers; encoding; frequency shift keying; laser noise; optical fibre networks; optical modulation; optical receivers; phase noise; sensitivity; simulation; Manchester coding; Miller code; alternate mark inversion; bit error probability; delay modulation; distributed feedback lasers; dual-branch detection; laser nonuniform FM response; laser phase noise; line coding schemes; linecoded optical heterodyne FSK systems; linecoding schemes; nonflat FM response; nonuniform BM response; nonuniform laser FM response; optical frequency shift keying; phase noise; random frequency noise; receiver noise; sensitivities; simulation; single-branch detection; Distributed feedback devices; Frequency modulation; Frequency shift keying; Laser feedback; Laser noise; Laser theory; Optical mixing; Optical noise; Optical receivers; Phase noise;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.372475

Filename

372475