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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 38,
  • Issue 2,
  • pp. 178-184
  • (2020)

A $4$ × $4$ Electrooptic Silicon Photonic Switch Fabric With Net Neutral Insertion Loss

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Abstract

We present a strictly nonblocking $4$ × $4$ electrooptic silicon photonic switch fabric with on-chip gain. The switch integrates 12 Mach-Zehnder cells in a 3-stage topology equipped with fast electrooptic phase shifters, and thermooptic phase trimmers. To compensate for the losses of the fabric, a 4-channel GaInAsP/InP semiconductor optical amplifier array is flip-chip attached into an etched cavity in the silicon photonic chip with butt-coupled waveguide interfaces. The chip is wirebonded to a CMOS driver that provides push-pull drive to each elementary Mach-Zehnder cell. We demonstrate an optical switch assembly with net neutral insertion loss in the C-band together with nanosecond-scale reconfiguration time.

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