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Enhanced Modulation Bandwidth by Delayed Push-Pull Modulated DFB Lasers.

Jiewen Chi1, Xun Li1,2, Chuanning Niu1

  • 1School of Information Science and Engineering, Shandong University, Qingdao 266237, China.

Micromachines
|March 29, 2023
PubMed
Summary
This summary is machine-generated.

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This study enhances distributed feedback laser bandwidth by introducing a detuned photon-photon resonance. This method doubles bandwidth to 50 GHz, overcoming limitations of carrier-photon resonance in directly modulated lasers.

Area of Science:

  • Photonics
  • Semiconductor Lasers
  • Optical Communications

Background:

  • Directly modulated lasers (DMLs) bandwidth is limited by carrier-photon resonance (CPR).
  • Photon-photon resonance (PPR) offers a pathway to higher frequencies.
  • Dual-sectional push-pull modulated (PPM) DFB lasers are cost-effective for PPR generation.

Purpose of the Study:

  • To overcome bandwidth limitations in PPM DFB lasers.
  • To compensate for the dip in PPR response.
  • To expand the bandwidth of PPM DFB DMLs.

Main Methods:

  • Introducing a detuned PPR.
  • Exploiting a time delay between differential signals.
  • Utilizing simulation to analyze PPR broadening and CPR restart.
Keywords:
CPRDFBDMLDPPMPPMPPR

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Main Results:

  • Broadened PPR peak and restarted CPR response observed.
  • Mitigation of the dip in the lower frequency side of the PPR peak.
  • Expanded PPM-DFB bandwidth to approximately 50 GHz.

Conclusions:

  • The detuned PPR approach effectively expands PPM-DFB bandwidth.
  • This method doubles the bandwidth compared to conventional DFB DMLs.
  • The technique offers a cost-effective solution for high-bandwidth DMLs.