MICRORING RESONATOR CHANNEL DROPPING FILTERS

Microring resonators side coupled to signal waveguides provide compact , narrow band, and large free spectral range optical channel dropping filters, Higher order filters with improved passband characteristics a nd larger out-of-band signal rejection are realized through the coupli ng of multiple rings, The analysis of these devices is approached by t he novel method of coupling of modes in time. The response of filters comprised of an arbitrarily large number of resonators may be written down by inspection, as a continued fraction, This approach simplifies both the analysis and filter synthesis aspects of these devices.