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We experimentally demonstrate simultaneous phase noise suppression and automatically locked tunable homodyne reception for 20-Gbaud QPSK signal. The phase noise deviation can be reduced by a factor of ∼3. Open I/Q eyes are obtained after the noise mitigation.
We demonstrate that apodized Bragg gratings placed in the two arms of a Mach-Zehnder structure in SOI can provide high-quality filtering functions overcoming phase noise distortions. As examples, we present narrowband, phase-shifted and dispersion-less filters.
We show that a dispersion-less filter with a narrow square-shaped passband exhibiting sidelobe suppression ratio reaching 13 dB can be fabricated in SOI using the superposition apodization technique and a phase noise reduction approach.
We present the first hybrid-integrated optical phase-lock loop (OPLL) for use in high spectral purity photonic terahertz sources. We have achieved the necessary short loop delay to lock a 1-MHz linewidth slave laser by hybrid integration of the slave laser and photodetector on a silicon motherboard with silica optical waveguides and combining this with a custom-designed low-delay electronic loop filter...
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