03186nam a2200385 4500 20260817161122.0 180698 th eng .b11597549 AIT Thesis no. TC-96-3 Zhang, Shu Fen 2-level, 4-level and 8-level PWM optical fiber transmission systems Bangkok : Asian Institute of Technology, 1996 76 p. Thesis ; no.TC-96-3 A thesis report submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology, 1996 Optical 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 Optical communications Zhang, Jian-Guo, Chairperson Ahmed, Kazi Mohiuddin, Examination Committee Makelainen, Kimmo, Examination Committee Asian Development Bank, Japan, Scholarship donor Asian Institute of Technology. Thesis ; no. TC-96-3 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B14969 .b11597549 mnait s 240401 0 970402 m a s 0 mnait mnarc 22 40 Barcode : 30050120809081 CREATED : 2014-05-14 RECORD # : i12798708 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160045984 CREATED : 2016-02-03 RECORD # : i12887663 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 15 15 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no. TC-96-3 30050120809081 2026-08-17 16:11:22 3 2026-08-17 22 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no. TC-96-3 30050160045984 2026-08-17 16:11:22 2026-08-17 40