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Updated: Mar 29, 2026

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Ultrafast Optical Analysis and Control of Spectral Flatness in Cavity-Less Electro-Optic Combs.

Xin Chen1, Hongyu Zhang1, Meicheng Fu1

  • 1College of Science, National University of Defense Technology, Changsha 410073, China.

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Summary

Cavity-less electro-optic combs (EOCs) spectral flatness is governed by the modulation extinction ratio of intensity modulators. Mitigating spectral interference improves EOC performance for applications like photonic analog-to-digital converters.

Keywords:
cavity-less electro-optic combsextinction ratiomicrowave photonicsspectral flatnessspectral interference

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Area of Science:

  • Optics and Photonics
  • Quantum Optics
  • Applied Physics

Background:

  • Cavity-less electro-optic combs (EOCs) are vital for optical communications, precision measurement, and microwave photonics due to their tunability, stability, and high power.
  • Optimizing spectral flatness is critical for enhancing EOC performance in these advanced applications.

Purpose of the Study:

  • To systematically investigate the physical factors influencing spectral flatness in EOCs.
  • To establish a mathematical relationship between spectral flatness and modulator properties.
  • To explore methods for mitigating spectral interference and improving EOC performance.

Main Methods:

  • Ultrafast measurements and advanced modeling simulations were employed.
  • Mathematical modeling established the nonlinear dependence of spectral flatness on modulation extinction ratio.
  • Cascading intensity modulators and high-sensitivity autocorrelator/FROG techniques were utilized for verification.

Main Results:

  • Finite modulation extinction ratios generate coherent spectral components with phase/amplitude variations, causing spectral interference and intensity fluctuations.
  • A nonlinear, third-order dependence was found between spectral flatness and modulation extinction ratio.
  • Cascading modulators improved extinction ratio, achieving a spectral flatness of 0.54 dB across 11 lines.
  • Significant enhancement in signal-to-noise-and-distortion (SINAD) was observed for photonic analog-to-digital converters (PADCs).

Conclusions:

  • Spectral interference, stemming from modulation extinction ratio, plays a subtle yet critical role in EOC generation.
  • The findings provide theoretical and experimental support for optimizing EOC performance.
  • This research advances the development and application of EOCs in precision measurement and communication systems.