DocumentCode :
1288872
Title :
Effect of nonuniform laser FM response on the performance of multichannel heterodyne FSK systems using optical amplifiers
Author :
Majumder, S.P. ; Alam, Mohammad S. ; Gangopadhyay, R.
Author_Institution :
Dept. of Electr. & Electron. Eng., Bangladesh Univ. of Eng. & Technol., Dhaka, Bangladesh
Volume :
15
Issue :
2
fYear :
1997
fDate :
2/1/1997 12:00:00 AM
Firstpage :
188
Lastpage :
193
Abstract :
A theoretical analysis is provided to evaluate the performance of optical frequency division multiplexed systems taking into considerations the combined effect of receiver noise, laser phase noise and nonuniform FM response characteristic of a practical DFB laser. To overcome the effect of nonuniform frequency modulation characteristic of semiconductor lasers, two different linecoding schemes are used for the laser driving signal. The crosstalk penalty due to the combined effect of nonuniform FM response and phase noise of lasers is evaluated. The improvement in receiver sensitivity due to optical preamplifier is also estimated. The computed results show that the performance of the system is highly degraded due to the effect of laser nonuniform fm response and can be reduced substantially by using linecoding. Further, there is considerable improvement in receiver sensitivity due to the use of an optical preamplifier in the absence of phase noise. In the presence of phase noise there is a reduction in receiver sensitivity
Keywords :
electro-optical modulation; encoding; frequency division multiplexing; frequency modulation; frequency shift keying; optical crosstalk; optical fibre communication; optical noise; optical receivers; semiconductor lasers; sensitivity; crosstalk penalty; highly degraded; laser driving signal; laser phase noise; linecoding schemes; multichannel heterodyne FSK systems; nonuniform FM response characteristic; nonuniform frequency modulation characteristic; nonuniform laser FM response; optical amplifiers; optical frequency division multiplexed systems; optical preamplifier; practical DFB laser; receiver noise; receiver sensitivity; semiconductor lasers; Frequency modulation; Laser noise; Laser theory; Optical crosstalk; Optical modulation; Optical noise; Optical receivers; Optical sensors; Phase noise; Semiconductor lasers;
fLanguage :
English
Journal_Title :
Lightwave Technology, Journal of
Publisher :
ieee
ISSN :
0733-8724
Type :
jour
DOI :
10.1109/50.554321
Filename :
554321
Link To Document :
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