We report on an integrated-optic 10 x 10 filter available for an add/drop multiplexer of a variable-capacity optical orthogonal frequency division multiplexing (OFDM) signal. The filter was composed of ten switches and ten delay lines sandwiched by two slab star couplers and was fabricated by use of a silica waveguide. The filter functions as both optical discrete Fourier transform and inverse discrete Fourier transform circuits for demultiplexing and multiplexing the optical OFDM signal, respectively. We show measured one input by multi-output and multi-input by one output transmittance regarding the filter. We achieved the filter that could process the optical OFDM signal ranging from 10 to 50 Gbaud per channel. The filter is helpful to the prospective adaptive optical network where the guard bands are decreased, and the channel number, symbol rate per channel and modulation formats are flexibly changed corresponding to the traffic and transmission distance.
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