Simulation of an AWG-based WDM system for local access with a spectrally-sliced-ASE source and EDFA-boosted optical channels | |
| Author | Ubonrat Duangthong |
| Call Number | AIT Thesis no.TC-02-20 |
| Subject(s) | Crosstalk Broadband communication systems Optical communications |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. TC-02-20 |
| Abstract | Due to the fast development of new broadband telecommunication services and the demand for high-speed services, the local-access network needs to be upgraded to allow on-demand use of broad bandwidth. Fiber-to-the-home (FTTH) system is an attractive way to provide a broad bandwidth. Spectrally-sliced wavelength-division-multiplexing (SSWDM) system is a strong candidate for future fiber-to-the-home access networks. It provides a cost-effective alternative to the use of laser sources for conventional WDM application by passively selecting discrete wavelength channels from a broadband source. The effect of intensity noise, optical bandwidth, channel crosstalk and ASE noise on bit-error-rate performance of an AWG-based WDM system for local access with a spectrally-sliced ASE source and EDFA-boosted optical channels is studied by simulation. In this system configuration, a broadband amplified spontaneous emission (ASE) source is spectrally sliced by an lxN arrayed waveguide grating (A WG) into N downstream channels. Each channel is individually intensity modulated, multiplexed by an Nxl A WG, amplified by in-line EDFA to compensate losses introduced by AWG and external modulator and coupled into the single-mode fiber. After transmission through a fiber, these multiplexed signals are demultiplexed by an lxN AWG in the remote node. The demultiplexed signals are sent to the corresponding PIN receivers for direct detection. Detection of ASE light will generate spontaneous-spontaneous beat noise. Moreover, the proposed system also suffer from the channel crosstalk caused by the extensions of tails of A WG's transmission function into other channels and from ASE noise generated by in-line EDFA. The simulation results show that the spontaneous-spontaneous beat noise can be reduced by increasing the optical bandwidth and/or decreasing the electrical bandwidth (bit rate). For each specified bit rate and received optical power, there is an optical bandwidth that gives minimum power penalty to achieve bit error rate of 10-9 and to obtain a maximum number of channels of one feeder. The simulation results also yield design criteria for capacity optimization of the proposed system. |
| Year | 2002 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TC-02-20 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Sharma, A. B. ; |
| Examination Committee(s) | Ahmed, Kazi M. ;Erke, Tapio J. ; |
| Scholarship Donor(s) | Telephone Organization of Thailand (TOT); |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2002 |