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Loss-coupled distributed-feedback lasers with amplified optical feedback for optical microwave generation.
Dae-Su Yee1, Young Ahn Leem, Sung-Bock Kim
1Optical Communication Devices Department, Electronics and Telecommunications Research Institute, Daejeon 305-350, South Korea. yds63508@etri.re.kr
Optics Letters
|November 5, 2004
Summary
Researchers developed multisection semiconductor lasers for optical microwave generation. These lasers exhibit high-frequency self-pulsations and continuous frequency tuning from 17-35 GHz.
Area of Science:
- Photonics
- Semiconductor Lasers
- Microwave Photonics
Background:
- Optical microwave generation is crucial for advanced communication systems.
- Multisection semiconductor lasers offer tunable frequency sources.
Purpose of the Study:
- To fabricate and characterize multisection semiconductor lasers for optical microwave generation.
- To investigate the self-pulsation dynamics and frequency tuning capabilities.
Main Methods:
- Fabrication of a three-section laser: loss-coupled distributed feedback (LC-DFB), phase control, and amplifier.
- Utilizing the concept of a single-mode laser with short optical feedback for self-pulsation generation.
- Analyzing the impact of optical feedback on self-pulsation and frequency tuning.
Main Results:
- Successfully generated high-frequency self-pulsations.
- Demonstrated the effect of optical feedback on self-pulsation, attributed to the LC-DFB's single-mode performance.
- Achieved continuous frequency tuning over the 17-35 GHz range.
Conclusions:
- The fabricated multisection semiconductor lasers are effective for optical microwave generation.
- The LC-DFB section's single-mode characteristic is key to controlling self-pulsation.
- The device offers a tunable source for microwave photonic applications.