NDLI: Picosecond pulse amplification in tapered-waveguide laser-diode amplifiers

Content Provider	IEEE Xplore Digital Library
Author	Ghafouri-Shiraz, H. Peh Wei Tan Aruga, T.
Copyright Year	1995
Abstract	The amplification characteristics of picosecond Gaussian pulses in conventional nontapered and both linear and exponential tapered-waveguide (TW) laser-diode amplifier (LDA) structures have been studied. The analysis is based on numerical simulation of the rate equation which also takes into account the effect of lateral carrier density distribution. The amount of pulse distortion experienced within the amplifier for input pulses having energies E/sub in/=0.1 E/sub sat(in)/=0.475 pJ (where E/sub sat(in)/ is the input saturation energy of the amplifier) and E/sub in/=E/sub sat(in)/=4.75 pJ have been analyzed for each structure which has a length of 900 /spl mu/m and an input width of 1 /spl mu/m. It has been found that the TW-LDA provides higher gain saturation and hence imposes less distortion on the amplified pulse as compared with a conventional nontapered LDA. The amplified 10-ps pulse used in this study experiences almost no broadening in the TW-LDA, whereas it suffers from broadening in the conventional nontapered LDA. The carrier density distribution and the dependence of the amplifier gain on the input pulse energy have also been studied for both nontapered and tapered amplifier structures. For example, in a TW-LDA with an output width of 20 /spl mu/m and a length of 900 /spl mu/m, the exponential structure provides 9-dB improvement in saturation energy as compared with the conventional amplifier. This improvement is about 10.5 dB in linear TW-LDAs.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	210
Ending Page	217
Page Count	8
File Size	494207
File Format	PDF
ISSN	1077260X
Volume Number	3
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pulse amplifiers Optical pulses Optical amplifiers Linear discriminant analysis Optical distortion Power generation Power amplifiers Optical pulse compression Charge carrier density Optical saturation
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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