This paper presents 1550-nm simulation results on the waveguided silicon-on-insulator four-port optical filtering and switching devices known as “SCISSOR” (an in-line array of microring resonators wherein each ring is coupled to two bus waveguides). We optimized the array number, the ring-bus coupling and the inter-ring spacing in order to obtain “rectangular” filter-passband shapes that have not heretofore been reported in the resonant-optics literature. We were able to engineer a box-like bandpass whose wavelength width could be anywhere from 5 to 50 % of the free spectral range (FSR). We then performed ring-bus apodization of the array that increased side-lobe suppression on the main filter band and widened the band. By reducing the FSR to 2.51 nm with increased ring diameter, we also showed that complete, high-extinction 2×2 optical switching is attained when the effective index of each ring in the group is changed by 2×10-3, giving 1.02-nm shift of the 0.77-nm passband. Tunable filtering, sensing, reconfigurable add/drop and wavelength-division de-multiplexing is offered in addition to switching.
© 2008 Optical Society of AmericaFull Article | PDF Article
John E. Heebner, Philip Chak, Suresh Pereira, John E. Sipe, and Robert W. Boyd
J. Opt. Soc. Am. B 21(10) 1818-1832 (2004)
S. J. Emelett and R. A. Soref
Opt. Express 13(12) 4439-4456 (2005)
Stephen J. Emelett and Richard A. Soref
Opt. Express 13(20) 7840-7853 (2005)