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A piezoelectrically actuated four-port Mach-Zehnder switch with 30-micros switching time and 0.25-dB insertion loss is demonstrated at a wavelength of 1.3 microm. The worst-case cross talk is below -21 dB for an arbitrary input polarization. The process of fabricating the switch from commercial fiber couplers with length matching of the interferometer arms is described.
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Fang et al. (1994) studied this question.
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