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Optical-referenceless optical frequency counter with twelve-digit absolute accuracy.

Atsushi Ishizawa1,2, Tadashi Nishikawa3, Kenichi Hitachi4

  • 1NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa, 243-0198, Japan. ishizawa.atsushi@nihon-u.ac.jp.

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This summary is machine-generated.

Researchers developed a new method to directly measure absolute optical frequencies (AOFs) with high accuracy, eliminating the need for an optical reference. This breakthrough advances optical metrology and enhances wireless communication speeds.

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Area of Science:

  • Metrology
  • Optical Physics
  • Electrical Engineering

Background:

  • Accurate measurement of absolute optical frequencies (AOFs) is crucial for advanced technologies like optical communications and navigation.
  • Current methods require an optical reference for twelve-digit accuracy, posing significant challenges due to direct measurement difficulties.

Purpose of the Study:

  • To develop a simpler and more accurate method for measuring AOFs.
  • To eliminate the need for an optical reference in high-accuracy AOF measurements.
  • To explore the potential of electro-optics-modulation combs for bridging the photonics-electronics frequency gap.

Main Methods:

  • Utilized an electro-optics-modulation comb to bridge the frequency gap between photonics and electronics.
  • Developed a direct measurement technique by introducing a frequency-unknown laser into an optical phase modulator.
  • Employed a radio frequency (RF) frequency counter for the measurement.

Main Results:

  • Demonstrated an unprecedented direct measurement of AOFs with twelve-digit accuracy.
  • Achieved a 100-fold phase-noise reduction in a conventional signal generator.
  • The method enables optical-referenceless optical frequency metrology.

Conclusions:

  • The novel method simplifies AOF measurement, paving the way for optical-referenceless metrology.
  • The technique significantly enhances the accuracy and applicability of frequency measurements.
  • Phase-noise reduction has the potential to increase wireless communication transmission speeds by approximately seven times.