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Frequency response control of semiconductor laser by using hybrid modulation scheme.
Optics Express
|November 10, 2016
Summary
A novel hybrid modulation scheme for semiconductor lasers improves modulation sensitivity. This method combines direct current and intra-cavity loss modulation, optimizing frequency response for enhanced performance at 20 GHz.
Area of Science:
- Optics and Photonics
- Semiconductor Device Physics
Background:
- Semiconductor lasers are crucial for optical communication.
- Controlling laser frequency response is essential for high-speed modulation.
- Existing modulation techniques have limitations in achieving desired frequency characteristics.
Purpose of the Study:
- To propose and validate a hybrid modulation scheme for semiconductor lasers.
- To investigate the impact of modulation ratio and time delay on laser frequency response.
- To enhance modulation sensitivity at high frequencies.
Main Methods:
- Developing a hybrid modulation scheme combining direct current (DC) modulation and intra-cavity loss modulation.
- Performing numerical calculations using semiconductor laser rate equations.
- Fabricating and experimentally testing the proposed hybrid modulation scheme.
Main Results:
- The hybrid modulation scheme effectively controls the laser's frequency response by adjusting modulation ratio and time delay.
- An optimal condition was identified where DC modulation compensates for non-flat frequency response from loss modulation.
- An 8.64-dB improvement in modulation sensitivity at 20 GHz was experimentally achieved compared to pure DC modulation.
Conclusions:
- Hybrid modulation offers superior control over semiconductor laser frequency response.
- This technique significantly enhances modulation sensitivity, particularly at high frequencies.
- The findings pave the way for improved semiconductor laser performance in optical systems.
