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Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
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Generation of optical frequency combs by Q-switching integrated multi-section semiconductor lasers.
Optics Express
|October 20, 2023
Summary
This study demonstrates a semiconductor laser generating broad optical frequency combs using Q-switching and optical injection. The integrated device produces high-power, short pulses for advanced photonic applications.
Area of Science:
- Photonics and Optics
- Semiconductor Lasers
- Nonlinear Optics
Background:
- Distributed Bragg reflector (DBR) semiconductor lasers are crucial for optical communications.
- Optical frequency combs are essential for spectroscopy, metrology, and sensing.
- Q-switching and optical injection are techniques to control laser output characteristics.
Purpose of the Study:
- To theoretically and computationally analyze an integrated four-section DBR semiconductor laser.
- To investigate the laser's behavior under optical injection and Q-switching.
- To explore the generation of broad optical frequency combs.
Main Methods:
- Theoretical analysis and simulations using a rate equation model.
- Integration of an electro-absorption modulator for Q-switching.
- Application of optical injection to the laser cavity.
Main Results:
- Q-switching operation yields very short, high-power pulses.
- Optical injection and Q-switching enable flat and broad optical frequency combs.
- Up to 2100 optical lines within 10 dB (642 lines within 3 dB) at 100 MHz repetition frequency were achieved.
Conclusions:
- The high chirp of Q-switched pulses is responsible for the broad spectra.
- The device's integrated structure is compatible with commercial fabrication.
- This technology offers a pathway to advanced photonic devices and applications.
