Performance of an AWG-based WDM system for local access with a spectrally-sliced-ASE source and EDFA-boosted optical channels | |
| Author | Li, Shuangbing |
| Call Number | AIT Thesis no.TC-01-10 |
| Subject(s) | Wavelength division multiplexing Wave guides |
| 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-01-10 |
| Abstract | The effect of the crosstalk and amplified spontaneous emission (ASE) noise that is introduced by the Erbium-doped fiber amplifiers (EDF A) on the spectral slicing wavelength division multiplexing (SS-WDM) local access system are studied. We propose a new topology for SS-WDM local access system. In this system configuration, an ASE source is used in the transmitter. The output of ASE source is spectral sliced by an arrayed waveguide grating (A WG) to generate a group of optical channels. The optical signals are combined by another A WG (multiplexer) after intensity modulation and amplified by inline EDF A to overcome the attenuation introduced by A WG and external modulator. There is an A WG (demultiplexer) in the receiver to separate WDM signal. It is an intensity modulation and direct detection (IM/DD) system. Since ASE has been used as a source, the detection of ASE light will generate spontaneous-spontaneous beat noise that is inverse proportional to the optical channel bandwidth. The transmission function of A WG will introduce crosstalk noise that can be adjusted by changing the channel space to optical channel bandwidth ratio. Both of them will degrade the system performance. We give a new derivation of the A WG performance. It provides some information to design an A WG with some specified parameters. Based on this transmission characteristic of the A WG, we analyze the performance of the SS-WDM local access system. The results of this analysis show that higher bit rate require a relatively wider optical channel bandwidth to reduce the spontaneousspontaneous beat noise and the less crosstalk noise can be tolerated. For each bit rate, there ยท are a minimum optical channel bandwidth to achieve bit eirnr rate less (Pe< I0-9 ) at a given optical received power and a maximum number of channels to increase the capacity of the feeder. To achieve this configuration, the structure of A WG needs to be re-designed. The results of this study give some useful information to do the realistic optical SS-WDM local access system design. |
| Year | 2001 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TC-01-10 |
| 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; |
| Scholarship Donor(s) | Government of Finland |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2001 |