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Shared-type Encoder/Decoder Based on 2-D Optical Codes for Large Capacity Optical CDMA Network  

Ko Wonseok (대우컴퓨터 제품연구실)
Shin Seoyong (명지대학교 통신공학과 광통신연구실)
Hwang Humor (명지대학교 무선통신연구실)
Chang Chulho (대조건설(주) CEO실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.5A, 2005 , pp. 359-369 More about this Journal
Abstract
For large capacity optical CDMA networks, we propose a shared-type encoder/decoders based on an tunable wavelength converter(TWC) and an arrayed waveguide grating (AWG) router. The proposed encoder/decoder treats codewords of wavelength/time 2-D code simultaneously using the dynamic code allocation property of the TWC and the cyclic property of the AWG router, and multiple subscribers can share the encoder/decoder in networks. Feasibility of the structure of the proposed encoder/decoder for dynamic code allocation is tested through simulations using two wavelength/time 2-D codes, which are the generalized multi-wavelength prime code(GMWPC) and the generalized multi-wavelength Reed-Solomon code(GMWRSC). Test results show that the proposed encoder/decoder can increase the channel efficiency not only by increasing the number of simultaneous users without any multiple-access interference but by using a relatively short length CDMA codes.
Keywords
large capacity optical CDMA networks; shared-type encoder/decoder; dynamic code allocation; wavelength/time 2-D code; arrayed waveguide grating(AWG) router;
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