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A wide-band guided-wave periodic multi/demultiplexer with a ring resonator for optical frequency-division-multiplexing (FDM) transmission systems is demonstrated. This periodic multildemultiplexer consists of a Mach-Zehnder interferometer and ring resonator. It has a Rat wide bandwidth and sharp cutoff regions. This paper describes theoretical analysis, design method, and experimental results of the multildemultiplexer. The fabricated periodic multi/demultiplexer with a ring resonator has 5-GHz channel frequency separation at the 1.55-pm wavelength region. Measured average loss was 4.8-dB and the average crosstalk was -13.2 dB. At 0.5-dB loss up from the minimum loss level, a width of 4.0 GHz was measured. This "0.5-dB bandwidth" is 1.8 times wider than that of the conventional MachZehnder type periodic multi/demultiplexer.

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