Gain-switched pulse generation of 5.3 ps from 30 GHz-modulation-bandwidth 1270 nm DFB laser diode

We generated gain-switched pulses via electrical pulse excitations in a 1270 nm distributed feedback (DFB) laser diode (LD) with a direct-modulation bandwidth of 30 GHz. The measurements revealed short-pulse widths of 5.3 and 8.8 ps with and without chirp compensation, via a single-mode optical fibe...

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Bibliographic Details
Published in:Optics letters 2023-12, Vol.48 (23), p.6344-6347
Main Authors: Kobayashi, Masataka, Nakamura, Takahiro, Nakamae, Hidekazu, Kim, Changsu, Akiyama, Hidefumi
Format: Article
Language:English
Subjects:
Bandwidths
Chirp
Compensation
Distributed feedback lasers
Modulation
Optical fibers
Semiconductor lasers
Short pulses
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Summary:We generated gain-switched pulses via electrical pulse excitations in a 1270 nm distributed feedback (DFB) laser diode (LD) with a direct-modulation bandwidth of 30 GHz. The measurements revealed short-pulse widths of 5.3 and 8.8 ps with and without chirp compensation, via a single-mode optical fiber. The 5.3 ps pulses exhibited a spectral width of 0.40 nm (spectral bandwidth of 71 GHz), yielding a time–bandwidth product of 0.38. Although the gain-switched pulses in DFB LDs inherently contain linear and nonlinear chirp, optimized pumping conditions enable generation of nearly transform-limited ps pulses after linear chirp compensation.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.510237