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Novel approach to design high-performance large-port-count switches in low-index-contrast materials based on cascaded multimode interference couplers

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3 Author(s)
Zhe Jin ; Photonics & Opt. Commun. Group, Univ. of New South Wales, Sydney, NSW, Australia ; Kaalund, C.J. ; Gangding Peng

Using a novel design approach, high-performance large-port-count switches based on cascaded multimode interference (MMI) couplers are shown to be feasible in low-index-contrast materials. This approach combines the transfer matrix method, optimization of the MMI dimensions, and mode propagation analysis (MPA) for calculation of phase shifts. 1×4, 1×8, 1×16, and 1×32 switches are designed, with insertion losses of 1 dB and crosstalk as low as -31.7 dB. Also, it is shown that this approach can balance the losses for different switch states.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:41 ,  Issue: 12 )