Phase engineering applied to integrated optical filters
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Optical filters are enabling for high density, high bitrate wavelength-division multiplexed (WDM) systems. Filters are required for a wide variety of tasks including (de)multiplexing channels, gain equalization and dispersion compensation. As the number of channels, utilized bandwidth of the fiber, spectral efficiency, and bitrate per channel increase, the demand for high performance, compact filters with great functionality and integration increases. Optical allpass filters are compact and easily fabricated in planar waveguides, offer new functionality such as dispersion compensation, and yield more efficient architectures for realizing bandpass filters.