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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
Summary
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.
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.
