Abstract

The switching characteristics of multimode interference photonic switches (MIPS) are analyzed by wide-angle finite difference beam propagation method (FD-BPM). As a result, it is found that the MIPS with a multimode interference (MMI) length of 599 µm can switch the output light polarization insensitively with a crosstalk of less than -20dB for a wavelength range of 70nm. These analyses show that the MIPS can also have a 3-dB coupler function. Experimentally,an InGaAsP/InP 1 × 2 MIPS with a thicker InP cladding layer was fabricated and exhibited switching operation with crosstalks of -8 dB and -10 dB at 0 and 20 mA current injections,respectively. For a 2 × 2 MIPS with a thinner InP cladding layer, better switching characteristics with a crosstalk of -13 dB and an extinction ratio of 17 dB were realized.

[IEEE ]

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J. Lightwave Technol. (3)

P. A. Besse, E. Gini, M. Bachmann and H. Melchior, "New 2 ×2 and 1 ×3 multimode interference couplers with free section of power splitting ratios", J. Lightwave Technol., vol. 14, pp. 2286-2293, Oct. 1996.

L. B. Soldano and E. C. M. Pennings, "Optical multi-mode interference devices based on self-imaging: Principles and application", J. Lightwave Technol., vol. 13, pp. 615-627, Apr. 1995.

P. A. Besse, M. Bachmann, H. Melchior, L. B. Soldano and M. K. Smit, "Optical bandwidth and fabrication tolerances of multimode interference couplers", J. Lightwave Technol., vol. 12, pp. 1004-1009, June 1994.

Opt. Lett. (1)

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