ICTACT Journal on Microelectronics

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Chirp Reduction in a Single Mode DM-SQW-DFB Laser Operated at Second Quantization State


Affiliations
1 Department of Electronics and Communication Engineering, National Institute of Technology, Srinagar, India
     

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We have observed the reduction in the chirp parameters (gain compression and above threshold α-factor) by operating the single quantum well laser at second quantization state. In this study, the carrier density at threshold is clamped by increasing the total cavity loss, so that the second energy level is populated leading to operation at second quantization state. We have identified wavelength shift towards the shorter wavelength side of the spectrum. Implies higher differential gain of the lasing mode, consequently decreases the effect of chirping in a directly modulated single QW laser.

Keywords

Directly Modulated (DM), Quantum Well (QW), Gain Compression, α-Factor, Chirping, Differential Gain.
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  • Chirp Reduction in a Single Mode DM-SQW-DFB Laser Operated at Second Quantization State

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Authors

Abida Yousuf
Department of Electronics and Communication Engineering, National Institute of Technology, Srinagar, India
Hakim Najeeb-Ud-Din
Department of Electronics and Communication Engineering, National Institute of Technology, Srinagar, India

Abstract


We have observed the reduction in the chirp parameters (gain compression and above threshold α-factor) by operating the single quantum well laser at second quantization state. In this study, the carrier density at threshold is clamped by increasing the total cavity loss, so that the second energy level is populated leading to operation at second quantization state. We have identified wavelength shift towards the shorter wavelength side of the spectrum. Implies higher differential gain of the lasing mode, consequently decreases the effect of chirping in a directly modulated single QW laser.

Keywords


Directly Modulated (DM), Quantum Well (QW), Gain Compression, α-Factor, Chirping, Differential Gain.

References