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 2024-01, Vol.11 (1), p.4
Main Authors: Chen, Na, Jiang, Yang, Lan, Xiaohong, Zi, Yuejiao, Xu, Jing, Li, Jiahui, Zhang, Qiong, Feng, Jinjian
Format: Article
Language:English
Subjects:
Chirp
Cost analysis
DML
Frequency discriminators
Lasers
linear chirp
Luminous intensity
Optical filters
Parabolas
parabolic pulses
Theoretical analysis
Waveform generators
Waveforms
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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.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics11010004