Abstract
AbstractA 7‐chip, 280‐Gchip/s quaternary phase‐shift code is assigned to short pulses after reflection from an encoder, the code is then recognized by a decoder. The encoder and decoder, consisting of superstructured fiber Bragg gratings (SSFBGs), are fabricated using the equivalent‐phase‐shift method; only ordinary phase masks and submicrometer precision in control are required. The quaternary phase encoding and decoding of short pulses at 40‐Gbit/s is experimentally demonstrated, and it is required in optical code division multiplexing (OCDM) systems and packet‐switched networks. Interchannel interference noise is also considered and evaluated; a nonlinear optical loop mirror (NOLM) within the receiver is introduced to suppress the interference noise as well as additive noise. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2409–2412, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22747
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