Abstract

The authors consider the configuration of the OFDM (optical frequency division multiplexing) broadband distribution networks, including the communication service, and discuss the following OFDM technologies: a multichannel frequency stabilization technique, a polarization-insensitive waveguide FS-SW (frequency selection switch), and an FSK (frequency-shift keying)/direct-detection scheme using a Mach-Zehnder filter. The waveguide FS-SW, consisting of seven Mach-Zender filters, successfully selected channels with a total crosstalk of less than -13 dB. The balanced receiver configuration of the OFD (optical frequency discriminator) receiver is 3 dB more sensitive than single-detection-type OFDs, such as a Fabry-Perot-filter-type discriminator. A 100-channel OFDM transmission/distribution experiment at 622 Mb/s over a 50 km fiber length was performed.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

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