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Fully polarisation independent Mach-Zehnder optical switch using a lattice-matched InGaAlAs/InAlAs MQW and high-mesa waveguide structure

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7 Author(s)
Yoshimoto, N. ; NTT Opto-Electron. Labs., Kanagawa, Japan ; Shibata, Y. ; Oku, S. ; Kondo, S.
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Using a semiconductor Mach-Zehnder optical switch, the authors have succeeded in obtaining polarisation-independent operation with respect to switching voltage and insertion loss. A polarisation-independent phase shift can be obtained by using a lattice-matched InGaAlAs/InAlAs MQW structure. To reduce the insertion loss difference between polarisations, the authors used a multimode-interferometer 3 dB coupler and a high-mesa waveguide structure in the switch

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Electronics Letters  (Volume:32 ,  Issue: 15 )