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Dependence of modulation bandwidth and chirp on carrier transport in high-speed quantum-well laser

MOUSTAFA AHMED1,*

Affiliation

  1. Department of Physics, Faculty of Science, King Abdulaziz University, 20203, Jeddah, Saudi Arabia

Abstract

This paper investigates the impacts of the carrier transport processes in quantum well lasers on the modulation bandwidth and frequency chirp. The study is based on linearizing the rate equations using small-signal analysis. The major transport processes include carrier transport in the separate channel heterojunction (SCH) and escape in the well. We introduce analytical forms of the intensity modulation (IM) response and chirp to modulated power ratio. We show that when the transport process is fast and the escape process is slow, the bandwidth becomes highest, and Agrawal’s relation of the bandwidth and resonance frequency applies. The chirp is independent of the transport processes..

Keywords

Quantum well laser, Carrier transport, Small-signal analysis, Modulation.

Submitted at: Oct. 12, 2024
Accepted at: April 15, 2025

Citation

MOUSTAFA AHMED, Dependence of modulation bandwidth and chirp on carrier transport in high-speed quantum-well laser, Journal of Optoelectronics and Advanced Materials Vol. 27, Iss. 3-4, pp. 93-99 (2025)