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<p>A scheme for generating Nyquist pulses with a 12-line doubled flat optical frequency comb (OFC) is presented by cascading two two-electrode Mach–Zehnder modulators (De-MZM). The first De-MZM1 can operate in the optical carrier suppression modulation state to obtain a 4-line OFC, which is then introduced into the optical interleaver phase-locked; the resulting 4-line OFC serves as the driving signal into the De-MZM2 for the secondary modulation to generate more comb lines. OFC amplitude is adjusted to satisfy the sinc-shaped Nyquist waveform characteristics by fixing two De-MZM modulation indices. Theoretical analysis and simulation results reveal that a 20&#xa0;GHz narrow-amplitude Nyquist pulse corresponding to a 12-line OFC can be generated using a 10&#xa0;GHz radio-frequency drive signal. Impacts of bias point drift of the two modulators are discussed and tolerance ranges are determined. 10&#xa0;GHz, 15&#xa0;GHz, and 30&#xa0;GHz Nyquist pulses are also generated based on the above theory. The approach offers the possibility of generating Nyquist pulses, facilitating their application in channel multiplexing.</p>

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Investigation on photonic generation of narrow-width frequency-doubled Nyquist pulses based on spectrum manipulation

  • 期刊论文

  • 发表日期：

    2025年4月13日

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  • Jin Yuan,
  • Xiuxiu Xu,
  • Ying Mei,
  • Jinbo Liu,
  • Zengrui Li

摘要

A scheme for generating Nyquist pulses with a 12-line doubled flat optical frequency comb (OFC) is presented by cascading two two-electrode Mach–Zehnder modulators (De-MZM). The first De-MZM1 can operate in the optical carrier suppression modulation state to obtain a 4-line OFC, which is then introduced into the optical interleaver phase-locked; the resulting 4-line OFC serves as the driving signal into the De-MZM2 for the secondary modulation to generate more comb lines. OFC amplitude is adjusted to satisfy the sinc-shaped Nyquist waveform characteristics by fixing two De-MZM modulation indices. Theoretical analysis and simulation results reveal that a 20 GHz narrow-amplitude Nyquist pulse corresponding to a 12-line OFC can be generated using a 10 GHz radio-frequency drive signal. Impacts of bias point drift of the two modulators are discussed and tolerance ranges are determined. 10 GHz, 15 GHz, and 30 GHz Nyquist pulses are also generated based on the above theory. The approach offers the possibility of generating Nyquist pulses, facilitating their application in channel multiplexing.