【摘 要】
：
We demonstrate a polarization-insensitive silicon 4 × 4 optical switch based on Mach-Zehnder interferometer[MZI]switch elements.On-chip polarization controllers are integrated before the switch fabric to automatically adjust an arbitrary input polarizatio
【机 构】
：
State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Institute for A
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We demonstrate a polarization-insensitive silicon 4 × 4 optical switch based on Mach-Zehnder interferometer[MZI]switch elements.On-chip polarization controllers are integrated before the switch fabric to automatically adjust an arbitrary input polarization to the transverse electric mode.The 4 × 4 switch fabric is based on a dilated double-layer network architecture to completely cancel the first-order crosstalk.Thermo-optic phase shifters are integrated in the MZI switch elements and the polarization controllers for adjustment of the switching state and polarization,respectively.We develop a polarization control algorithm based on a gradient descent method for automated polarization control.The polarization recovery time is less than 4 ms,and the measured polarization-dependent loss is ～2 dB.The scheme provides a new solution for realizing polarization-insensitive silicon optical switches.
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