000			03186nam a2200385 4500
005			20260817161122.0
008			180698 th eng
035			_a.b11597549
099		9	_aAIT Thesis no. TC-96-3
100	1		_aZhang, Shu Fen
245	1	0	_a2-level, 4-level and 8-level PWM optical fiber transmission systems
260			_aBangkok : _bAsian Institute of Technology, _c1996
300			_a76 p.
490	1		_aThesis ; _vno.TC-96-3
500			_aA thesis report submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1996
520			_aOptical transm1ss1on has become more and more widely used recently. The new modulation techniques associated with the transmission system need to be investigated for a better system performance in a cost effective manner. In this thesis study is to investigate the application of the digital pulse width modulation technique DPWM in optical fiber transmission system. A way of signal detection named timing window detection method is presented. The standard of time decision error is also established. The relationship between error probability and receiver sensitivity of the three systems are derived based on the error occurrence mechanism. The system performance of 2, 4, and 8-level PWM system is evaluated in the presence of the noises. The receiver sensitivity performance is analyzed by considering the bit error rate of 10·9 for the optical receiver using Avalanche Photodiode detector. The minimum required average peak optical power, which is required by digital optical fiber system to guarantee the 10·9 BER at an optical receiver, is calculated. The analysis results show that the 4-level PWM system can perform better than other PWM systems. The effect of the timing detection window width to the receiver sensitivity is also investigated. The receiver sensitivity performance of DPWM system is compared with the convensional PCM system for the same system parameter used. Results show that the 2-level, 4-level and 8-level PWM can perform better than PCM system at lower bit rate
650	1	0	_aOptical communications
700	1		_aZhang, Jian-Guo, _eChairperson
700	1		_aAhmed, Kazi Mohiuddin, _eExamination Committee
700	1		_aMakelainen, Kimmo, _eExamination Committee
710	2		_aAsian Development Bank, Japan, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. TC-96-3
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B14969
907			_a.b11597549 _bmnait _cs
902			_a240401
998			_b0 _c970402 _dm _ea _fs _g0
945			_lmnait
945			_lmnarc
942			_c22
942			_c40
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