| Author | Zhang, Shu Fen |
| Call Number | AIT Thesis no. TC-96-3 |
| Subject(s) | Optical communications
|
| Note | A thesis report submitted in partial fulfillment of the requirements for the degree of Master of
Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | 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 |
| Year | 1996 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Zhang, Jian-Guo |
| Examination Committee(s) | Ahmed, Kazi Mohiuddin;Makelainen, Kimmo |
| Scholarship Donor(s) | Asian Development Bank, Japan
|
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1996 |