Ultrafast all-optical code-division multiple-access networks

Wing C. Kwong; Paul R. Prucnal; Yanming Liu

doi:10.1117/12.139302

17 December 1992 Ultrafast all-optical code-division multiple-access networks

Wing C. Kwong, Paul R. Prucnal, Yanming Liu

Author Affiliations +

Proceedings Volume 1787, Multigigabit Fiber Communications; (1992) https://doi.org/10.1117/12.139302
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

In optical code-division multiple access (CDMA), the architecture of optical encoders/decoders is another important factor that needs to be considered, besides the correlation properties of those already extensively studied optical codes. The architecture of optical encoders/decoders affects, for example, the amount of power loss and length of optical delays that are associated with code sequence generation and correlation, which, in turn, affect the power budget, size, and cost of an optical CDMA system. Various CDMA coding architectures are studied in the paper. In contrast to the encoders/decoders used in prime networks (i.e., prime encodes/decoders), which generate, select, and correlate code sequences by a parallel combination of fiber-optic delay-lines, and in 2ⁿ networks (i.e., 2ⁿ encoders/decoders), which generate and correlate code sequences by a serial combination of 2 X 2 passive couplers and fiber delays with sequence selection performed in a parallel fashion, the modified 2ⁿ encoders/decoders generate, select, and correlate code sequences by a serial combination of directional couplers and delays. The power and delay- length requirements of the modified 2ⁿ encoders/decoders are compared to that of the prime and 2ⁿ encoders/decoders. A 100 Mbit/s optical CDMA experiment in free space demonstrating the feasibility of the all-serial coding architecture using a serial combination of 50/50 beam splitters and retroreflectors at 10 Tchip/s (i.e., 100,000 chip/bit) with 100 fs laser pulses is reported.

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Wing C. Kwong, Paul R. Prucnal, and Yanming Liu "Ultrafast all-optical code-division multiple-access networks", Proc. SPIE 1787, Multigigabit Fiber Communications, (17 December 1992); https://doi.org/10.1117/12.139302

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