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Nonlinearly broadened phase-modulated continuous-wave laser frequency combs characterized using DPSK decoding.

Chen-Bin Huang1, Sang-Gyu Park, Daniel E Leaird

  • 1School of Electrical and Computer Engineering, Purdue University, 465 Northwestern Ave., West Lafayette, IN 47907-2035, USA. robinh@purdue.edu

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Summary

This study broadens laser combs using nonlinear propagation in different media. Experimental results using a differential phase shift keying decoder align with radio-frequency spectrum analyzer data.

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Area of Science:

  • Optics and Photonics
  • Nonlinear Optics
  • Laser Technology

Background:

  • Phase-modulated continuous-wave (CW) laser combs are crucial for precise frequency measurements.
  • Spectral broadening of laser combs is essential for enhancing their performance in various applications.
  • Understanding nonlinear propagation effects is key to controlling laser comb characteristics.

Purpose of the Study:

  • To spectrally broaden a 9.953 GHz phase-modulated CW laser comb.
  • To investigate the effects of nonlinear propagation in both normal and anomalous dispersion media.
  • To experimentally validate the broadened laser comb characteristics using a differential phase shift keying (DPSK) decoder.

Main Methods:

  • Utilized a 9.953 GHz phase-modulated continuous-wave (CW) laser.
  • Employed nonlinear propagation in normal and anomalous dispersion media for spectral broadening.
  • Characterized the broadened laser comb using a differential phase shift keying (DPSK) decoder.
  • Measured bit-error rate (BER) data and compared with radio-frequency (RF) spectrum analyzer results.

Main Results:

  • Successfully spectrally broadened the 9.953 GHz phase-modulated CW laser comb.
  • Observed distinct spectral broadening characteristics in normal and anomalous dispersion media.
  • DPSK bit-error rate data showed qualitative agreement with RF spectrum analyzer measurements, validating the experimental approach.

Conclusions:

  • Nonlinear propagation effectively broadens phase-modulated CW laser combs.
  • DPSK decoding provides a viable method for characterizing spectrally broadened laser combs.
  • The experimental findings support the theoretical understanding of nonlinear optical phenomena in laser comb generation and characterization.