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Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Chip-based frequency combs with sub-100 GHz repetition rates.

Adrea R Johnson1, Yoshitomo Okawachi, Jacob S Levy

  • 1School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA. arj46@cornell.edu

Optics Letters
|March 2, 2012
PubMed
Summary

High-Q silicon-nitride resonators generate broadband optical frequency combs. This advance is key for linking optical and electronic technologies using CMOS systems.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Semiconductor Technology

Background:

  • Optical frequency combs are crucial for precise frequency measurements.
  • Miniaturization and integration of frequency comb sources are ongoing challenges.
  • Silicon nitride photonics offers low loss and broad transparency windows.

Purpose of the Study:

  • To demonstrate broadband optical frequency combs using high-Q silicon nitride resonators.
  • To explore the potential of these combs for integrated photonic systems.
  • To advance the development of CMOS-compatible optoelectronic systems.

Main Methods:

  • Fabrication of high-Q silicon nitride spiral resonators.
  • Generation of frequency combs via cascaded four-wave mixing.
  • Characterization of the 20 GHz free spectral range (FSR) comb's RF beat note.

Main Results:

  • Demonstrated frequency combs spanning over 200 nm.
  • Achieved FSRs of 80, 40, and 20 GHz.
  • Measured a 3.6 MHz linewidth for the 20 GHz FSR comb, consistent with thermal fluctuations.

Conclusions:

  • High-Q silicon nitride spiral resonators are effective for generating broadband frequency combs.
  • The demonstrated combs show promise for integrated photonic applications.
  • This work represents a significant step towards CMOS-based optical-electronic linking systems.