Abstract
This study proposes a dense multichannel optical waveguide switch based on micro ring
resonators (MRRs). The proposed design is achieved by cascading five MRRs of the same structure
and the phase difference between two bus waveguides that are evanescently coupled to every two
MRRs is purposely set at either 0 or π in order to minutely adjusting the positions of the
corresponding resonant wavelengths of the MRRs. Our proposed structure is capable of controlling
ON/OFF signals associated with four optical channels. Our study finds that the resonant channel
spacing is less than twice the full-width-at-half-maximum of an individual optical signal.
Furthermore, among 16 different combinations of output spectra obtained, the ON/OFF signal
contrast of each optical channel could reach up to −29.68 dB.
© 2014 IEEE
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