DSP-Enabled Frequency Locking for Near-Nyquist Spectral Efficiency Superchannels utilizing Integrated Photonics

Digitally synthesized near-Nyquist subcarriers and photonic integration are shown to improve spectral efficiency. Spectral utilization 3.3% over baud rate is enabled by 1% Root-Raised-Cosine shaping and precision adjacent-channel wavelocking σ <;100 MHz.