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Tunable photonic microwave generation using optically injected semiconductor laser dynamics with optical feedback

Jun-Ping Zhuang1, Sze-Chun Chan

  • 1Department of Electronic Engineering, City University of Hong Kong, Hong Kong, China.

Optics Letters
|February 6, 2013
PubMed
Summary

This study demonstrates stable microwave generation from a semiconductor laser using optical injection and dual-loop feedback. This method achieves high-frequency generation with significantly improved spectral purity and stability.

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Area of Science:

  • Photonics
  • Nonlinear Dynamics
  • Optoelectronics

Background:

  • Semiconductor lasers are crucial for generating microwave frequencies.
  • Controlling nonlinear dynamics in lasers is key for stable signal generation.
  • Optical injection and feedback are common techniques to manipulate laser dynamics.

Purpose of the Study:

  • To investigate period-one (P1) nonlinear dynamics for photonic microwave generation.
  • To stabilize oscillation frequency fluctuations using dual-loop optical feedback.
  • To achieve high-frequency photonic microwave generation with narrow linewidth and low phase noise.

Main Methods:

  • Utilizing optical injection to induce period-one (P1) dynamics in a semiconductor laser.
  • Implementing a dual-loop optical feedback system to stabilize frequency.
  • Characterizing the generated microwave signal's frequency, linewidth, and phase noise.

Main Results:

  • Demonstrated photonic microwave generation at 45.424 GHz.
  • Achieved a linewidth below 50 kHz from a laser with a 7 GHz relaxation resonance frequency.
  • Dual-loop feedback narrowed linewidth by over 10x, reduced phase noise variance by >500x, and suppressed spectral side peaks.

Conclusions:

  • Optical injection and dual-loop feedback effectively enable stable, high-frequency photonic microwave generation.
  • The proposed method significantly enhances spectral purity and reduces phase noise.
  • This technique offers a viable solution for high-performance photonic microwave sources.