Add/Drop Filters Using Over Coupled Ring Resonator
In this paper, the performance of add/drop filters based on over-coupled ring resonators is analysed. Over coupling improves the performance of the filters by providing a wider bandwidth over which high crosstalk suppression is achieved. Interband and intra-band crosstalk associated with Wavelength Division Multiplexing (WDM) in optical filters is examined as a function of coupling coefficients. In over coupled double-ring resonators, the crosstalk suppression bandwidth is increased in comparison with that of critically-coupled ring resonators.
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