研究目的
Investigating the regeneration of frequency combs for self-homodyne superchannel detection using optical injection locking and parametric mixing, and evaluating the effects of dispersive walk-off between unmodulated carriers.
研究成果
The study successfully demonstrates comb regeneration for self-homodyne superchannels using OIL and parametric mixing, with theoretical and experimental agreement on the limitations imposed by carrier OSNR and dispersive walk-off. The technique shows promise for relaxing DSP requirements in high-order QAM signal detection.
研究不足
The study is limited by the OSNR of the input carriers and the temporal decorrelation caused by dispersive walk-off, which restricts the number of regenerated carriers without significant linewidth degradation. The transmission distance is also limited by these factors.
1：Experimental Design and Method Selection:
The study involves the use of optical injection locking (OIL) and a parametric mixer for comb regeneration. Theoretical analysis is conducted on the effect of dispersive walk-off between carriers.
2：Sample Selection and Data Sources:
Two unmodulated carriers with specific OSNR levels are used to regenerate the comb. The effect of temporal decorrelation is emulated by varying the delay between carriers.
3：List of Experimental Equipment and Materials:
Includes an electro-optic comb, erbium-doped fiber amplifier (EDFA), wavelength-selective switch (WSS), highly-nonlinear fiber (HNLF), single-mode fiber (SMF), and an electrical spectrum analyzer for linewidth measurement.
4：Experimental Procedures and Operational Workflow:
The setup involves generating an electro-optic comb, filtering and attenuating specific carriers, noise loading via EDFA, OIL stage, parametric mixing, and linewidth measurement using self-heterodyne technique.
5：Data Analysis Methods:
Linewidth of regenerated carriers is measured and compared against theoretical predictions to assess comb regeneration fidelity under various conditions.
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