NDLI: Design Considerations for Asymmetric Multiple Quantum Well Broad Spectral Width Superluminescent Diodes

Content Provider	IEEE Xplore Digital Library
Author	Jingcong Wang Hamp, M.J. Cassidy, D.T.
Copyright Year	1965
Abstract	We investigated the design of broad spectral width super luminescent diodes (SLDs) with asymmetric multiple-quantum-well (AMQW) active regions. The design is based on theoretical modeling, which starts with calculation of the gain. Two InGaAsP/InP AMQW SLD structures centered at 1.3 mum were grown and processed. Both gave a broad spectral width of >80 nm when operated at the transition carrier density (TCD). Structure 1 was designed based on gain simulations only and was found to be able to provide broad spectral width only at low injection currents. Thus, Structure 1 gives low output power. Based on this experience, structure 2 was designed to achieve a broad gain at a higher TCD than Structure 1. Experimental results show that structure 2 provided a reasonable power and broad spectral width at the TCD. Thus, we conclude that, compared with normal design criterion which depends on the gain spectrum only, the design of an AMQW SLD has to include a relatively high TCD to obtain reasonable output power. The SLDs were ridge waveguide structures with seven degree tilted-stripes. Use of double section waveguides could further broaden the SLD spectrum at the red side by >10 nm.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	1256
Ending Page	1262
Page Count	7
File Size	238230
File Format	PDF
ISSN	00189197
Volume Number	44
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Superluminescent diodes Optical waveguides Charge carrier density Optical noise Power generation Light sources Biomedical optical imaging Optical scattering Optical sensors Biological tissues transition carrier density (TCD) Asymmetric multiple quantum well (AMQW) superluminescent diode (SLD)
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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