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008 050799s1998 u uzm rtt 00| a1eng d
035 _a.b11754308
099 9 _aAIT Thesis no.TC-98-04
100 1 _aChao, Xin Qin
245 1 0 _aImprovement on the capacity of WDM systems by using error correction codes
260 _aBangkok :
_bAsian Institute of Technology,
_c1998
300 _a76 p.
490 1 _aThesis ;
_vno. TC-98-04
500 _aA thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Advanced Technologies
502 _aThesis (M.Eng.) - Asian Institute of Technology, 1998
520 _aA system configuration is proposed in which the Intensity Modulation (direct modulation) and PIN Direct Detection (IM/DD) scheme is employed in the Wavelength Division Multiplexing system with or without EDF A as optical preamplifier. This approach only need low cost multi-mode Fabry-Perot laser as light source and eliminate the need for an expensive single-mode optical laser. Based on the use of tunable Fabry-Perot optical filter as demultiplexer to select the desired channel signal from multichannel signals, the tradeoff between power efficiency of optical filter and bandwidth efficiency of WDM system has been studied, the optimized optical bandwidth bas been achieved. In this work, the performance of optically preamplified intensity modulation-direct detection (IM-DD) receiver is investigated in terms of bit error rate and sensitivity by employing semiclassical theory coupled with Gaussian approximation method. The analysis provides closed-form expression for sensitivity. Our results show that the total number of uses in WDM system strongly depends on the type of optical filter and the optical bandwidth chosen. In addition our results show direct modulation method limits the capacity of WDM systems due to frequency chirping which relaxes signal spectrum linewidth. We present the very efficient way to improve the capacity of the WDM systems by using forward error correction (FEC) codes. After using FEC the total number of channels which the WDM system can support has been doubled.
650 0 _aOptical communications
650 0 _aError-correcting codes (Information theory)
700 1 _aZhang, Jian-Guo,
_eChairperson
700 1 _aSharma, A.B.,
_eExamination Committee
700 1 _aErke, Tapio J.,
_eExamination Committee
710 2 _aAsian Institute of Technology Partial Scholarship,
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. TC-98-04
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B13569
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