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

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4 Author(s)
Majumder, S.P. ; Dept. of Electr. & Electron. Eng., Bangladesh Univ. of Eng. & Technol., Dhaka, Bangladesh ; Gangopadhyay, R. ; Alam, M.S. ; Prati, G.

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

Published in:

Lightwave Technology, Journal of  (Volume:13 ,  Issue: 4 )

Date of Publication:

Apr 1995

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