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<p>Optical frequency combs consist of evenly spaced single frequencies that are phase-locked to one another and are highly effective in applications such as optical spectroscopy, remote sensing and telecommunications. Integrated optical frequency combs hold great promise for a broader range of consumer technologies but face challenges in terms of stability, efficiency and controllability. Here we demonstrate a quantum walk comb in synthetic frequency space formed by externally modulating a semiconductor optical amplifier operating in the telecommunication wavelength range in a unidirectional ring cavity. Although interband active regions were generally considered to exhibit slow-gain dynamics, we show that the ultra-fast intraband component of the gain saturation is responsible for the stabilization of the comb in a broad frequency-modulated state. Compared with quantum walk combs previously demonstrated using a quantum cascade laser, our device benefits from the low thresholds associated with interband emission and demonstrates a wallplug efficiency of up to 6%. Our device produces a nearly flat broadband comb with a tunable repetition frequency reaching a bandwidth of 1.8 THz at the fundamental repetition rate of 1 GHz while remaining fully locked to the radio frequency drive. Comb operation at harmonics of the repetition rate up to 14.1 GHz is also demonstrated.</p>

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A quantum walk comb source at telecommunication wavelengths

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Bahareh Marzban,
  • Lucius Miller,
  • Alexander Dikopoltsev,
  • Mathieu Bertrand,
  • Tobias Blatter,
  • Laurenz Kulmer,
  • Juerg Leuthold,
  • Giacomo Scalari,
  • Jérôme Faist

摘要

Optical frequency combs consist of evenly spaced single frequencies that are phase-locked to one another and are highly effective in applications such as optical spectroscopy, remote sensing and telecommunications. Integrated optical frequency combs hold great promise for a broader range of consumer technologies but face challenges in terms of stability, efficiency and controllability. Here we demonstrate a quantum walk comb in synthetic frequency space formed by externally modulating a semiconductor optical amplifier operating in the telecommunication wavelength range in a unidirectional ring cavity. Although interband active regions were generally considered to exhibit slow-gain dynamics, we show that the ultra-fast intraband component of the gain saturation is responsible for the stabilization of the comb in a broad frequency-modulated state. Compared with quantum walk combs previously demonstrated using a quantum cascade laser, our device benefits from the low thresholds associated with interband emission and demonstrates a wallplug efficiency of up to 6%. Our device produces a nearly flat broadband comb with a tunable repetition frequency reaching a bandwidth of 1.8 THz at the fundamental repetition rate of 1 GHz while remaining fully locked to the radio frequency drive. Comb operation at harmonics of the repetition rate up to 14.1 GHz is also demonstrated.