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Linearly chirped microwave waveform generation with large time-bandwidth product by optically injected semiconductor
Optics Express
|August 10, 2016
Summary
A novel method generates large time-bandwidth product (TBWP) linearly chirped microwave waveforms (LCMWs) using an optically injected semiconductor laser. This simple, tunable system achieves high TBWP for advanced microwave signal generation.
Area of Science:
- Photonics
- Semiconductor Lasers
- Microwave Engineering
Background:
- Linearly chirped microwave waveforms (LCMWs) are crucial for applications requiring wide bandwidth and long duration.
- Generating LCMWs with a large time-bandwidth product (TBWP) presents significant engineering challenges.
Purpose of the Study:
- To propose and demonstrate a simple and compact scheme for photonic generation of LCMWs with a large TBWP.
- To investigate the tunability of generated LCMWs' center frequency, bandwidth, and temporal duration.
Main Methods:
- Utilizing an optically injected semiconductor laser operating in a period-one (P1) oscillation state.
- Employing optical-to-electrical conversion to generate microwave signals.
- Controlling the injection strength to determine the microwave signal's frequency and achieve large TBWP.
Main Results:
- Successfully generated LCMWs with TBWPs as large as 1.2x10^5.
- Achieved a bandwidth of 12 GHz and a temporal duration of 10 μs.
- Demonstrated easy adjustment of center frequency, bandwidth, and temporal duration.
Conclusions:
- The proposed scheme offers a simple and effective method for generating high-TBWP LCMWs.
- The system's tunability makes it suitable for diverse microwave signal applications.
- This photonic approach provides a flexible platform for advanced waveform generation.
