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Microring resonator channel dropping filters

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5 Author(s)
Little, B.E. ; Dept. of Electr. Eng. & Comput. Sci., MIT, Cambridge, MA, USA ; Chu, S.T. ; Haus, H.A. ; Foresi, J.
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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 and larger out-of-band signal rejection are realized through the coupling of multiple rings. The analysis of these devices is approached by the novel method of coupling of modes in time. The response of filters comprised of an arbitrarily large dumber 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

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Lightwave Technology, Journal of  (Volume:15 ,  Issue: 6 )