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26 November 2007 Hybrid WDM/OCDMA for next generation access network
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Proceedings Volume 6783, Optical Transmission, Switching, and Subsystems V; 678328 (2007)
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China
Hybrid wavelength division multiplexing/optical code division multiple access (WDM/OCDMA) passive optical network (PON), where asynchronous OCDMA traffic transmits over WDM network, can be one potential candidate for gigabit-symmetric fiber-to-the-home (FTTH) services. In a cost-effective WDM/OCDMA network, a large scale multi-port encoder/decoder can be employed in the central office, and a low cost encoder/decoder will be used in optical network unit (ONU). The WDM/OCDMA system could be one promising solution to the symmetric high capacity access network with high spectral efficiency, cost effective, good flexibility and enhanced security. Asynchronous WDM/OCDMA systems have been experimentally demonstrated using superstructured fiber Bragg gratings (SSFBG) and muti-port OCDMA en/decoders. The total throughput has reached above Tera-bit/s with spectral efficiency of about 0.41. The key enabling techniques include ultra-long SSFBG, multi-port E/D with high power contrast ratio, optical thresholding, differential phase shift keying modulation with balanced detection, forward error correction, and etc. Using multi-level modulation formats to carry multi-bit information with single pulse, the total capacity and spectral efficiency could be further enhanced.
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Xu Wang, Naoya Wada, T. Miyazaki, G. Cincotti, and Ken-ichi Kitayama "Hybrid WDM/OCDMA for next generation access network", Proc. SPIE 6783, Optical Transmission, Switching, and Subsystems V, 678328 (26 November 2007);

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