A Parabolic Waveform Generator Based on the Chirp Characteristics of a Directly Modulated Laser

Due to carrier dynamics, the modulated light field from a directly modulated laser (DML) has an intensity envelope with a certain frequency chirp. When the chirp is linearly mapped into intensity by a frequency discriminator such as an optical filter with a linear edge, the optical field presents a...

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Bibliographic Details
Published in:Photonics
Main Authors: Na Chen, Yang Jiang, Xiaohong Lan, Yuejiao Zi, Jing Xu, Jiahui Li, Qiong Zhang, Jinjian Feng
Format: Article in Journal/Newspaper
Language:English
Published: MDPI AG 2023
Subjects:
DML
linear chirp
parabolic pulses
Applied optics. Photonics
TA1501-1820
Online Access:https://doi.org/10.3390/photonics11010004
https://doaj.org/article/8358280f51e44cdc967f8cc2107becd6
Description
Summary:Due to carrier dynamics, the modulated light field from a directly modulated laser (DML) has an intensity envelope with a certain frequency chirp. When the chirp is linearly mapped into intensity by a frequency discriminator such as an optical filter with a linear edge, the optical field presents a new signal determined by the multiplication operation between the envelope function and the chirp function. Under a triangular drive signal, this process can contribute dark, bright and frequency-doubled bright parabolic waveforms by properly adjusting the filter window. This method is verified by both a theoretical analysis and experimental demonstrations. It not only provides a low-cost and simple scheme to generate parabola signals, but also a new method for arbitrary waveform generation.

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