Abstract
We propose an add-drop filter with an unlimited free spectral range (FSR). The device is based on grating-assisted contradirectional couplers with silicon-on-insulator ridge waveguides. The intrawaveguide coupling is significantly diminished by distancing the periodically structured corrugated waveguide away from the straight input waveguide. Based on this asymmetric structure, calculated results show that the peak reflectivity of the intrawaveguide coupling is lower than 0.1dB, while that of the contradirectional coupling is higher than 20dB. An experimental result of 1.8dB for the intrawaveguide coupling is obtained. A narrow drop-port bandwidth of 0.8nm is also achieved experimentally.
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