Optical generation of Nyquist-spacing super-channel using a ring resonator-based flat-top interleaver

We experimentally demonstrate optical generation of a super-channel of 7 × 12.5 Gbaud QPSK-modulated subcarriers at Nyquist spacing, using a flat-top interleaver. The interleaver comprises a two-ring-resonator-assisted Mach-Zehnder interferometer with only an 8% excess bandwidth at 25-dB stopband suppression.

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