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Bandwidth-enhanced LFM waveform generator based on dynamic control of an optically injected semiconductor laser
Optics Letters
|August 1, 2022
Summary
A new method enhances linear frequency-modulated (LFM) waveform bandwidth using a dynamically controlled optically injected semiconductor laser (OISL). This technique achieves significantly wider bandwidths for advanced microwave signal generation.
Area of Science:
- Photonics and Optics
- Microwave Engineering
- Semiconductor Lasers
Background:
- Optically injected semiconductor lasers (OISLs) offer tunable microwave signal generation.
- Existing methods face bandwidth limitations due to the achievable frequency range in the period-one (P1) oscillation state.
Purpose of the Study:
- To propose and demonstrate a bandwidth-enhanced linear frequency-modulated (LFM) waveform generation scheme.
- To overcome the bandwidth limitations of traditional OISL-based microwave signal generation.
Main Methods:
- Utilizing an OISL operating in the period-one (P1) oscillation state.
- Dynamically controlling optical injection strength and detuning frequency using an electrical control signal with a quasi-sawtooth profile.
- Photodetection to convert optical signals into tunable microwave signals.
Main Results:
- Generated tunable microwave signals with frequency determined by injection strength and detuning.
- Achieved LFM waveforms with synthesized bandwidths of 8 GHz (12-20 GHz) experimentally.
- Simulated LFM waveforms with a synthesized bandwidth of 24.8 GHz (12.6-37.4 GHz).
Conclusions:
- The proposed dynamic control scheme effectively enhances LFM waveform bandwidth.
- This method provides a viable approach for generating wideband microwave signals for various applications.
- The technique overcomes inherent bandwidth limitations of OISLs in the P1 state.
