Low driving voltage InP-based Mach-Zehnder modulators for compact 128 Gb/s DP-QPSK module

We demonstrated the InP-based DP-QPSK modulator monolithically integrated with four Mach-Zehnder modulators planarized by the benzocyclobutene polymer. Clear eye-opening under 32 Gb/s operation was successfully achieved in all of four Mach-Zehnder modulators at a low driving voltage of 1.8 Vpp.

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