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Journal of Applied Science & Engineering

Dhaka University Journal of Applied Science & Engineering

Issue: Vol. 6, No. 1, January 2021
Title: Quantum Noise and External Feedback Noise in InGaN Violet-Blue Laser Diodes

Keywords: Blue laser, feedback noise, infrared laser, InGaN, intensity noise, quantum noise, semiconductor laser

Numerical characterization of quantum noise in InGaN violet-blue semiconductor lasers have been demonstrated in this paper. We also focused on OFB noise, known as optical feedback noise, generated due to re-injected laser radiation after being reflected from an optical disc. The noise characteristics of violet-blue laser diodes were compared to those of near-infrared GaAs lasers. We confirm that near-infrared laser diodes have better quantum noise characteristics than violet-blue lasers. We numerically integrate the time-delay rate equation model of semiconductor lasers operating in multimode to assess output noise, both quantum and OFB. Spectral profiles of noise are used to characterize the noise problem. Numerical results confirm that the violet-blue lasers show better performance compared to near-infrared lasers under external OFB

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