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Effect of Well Number in 1.3 µm GaInAsP Graded-Index Separate-Confinement-Heterostructure Multiple-Quantum-Well (GRIN-SCH-MQW) Laser Diodes

Akihiko KASUKAWA, Yoshihiro IMAJO, Ian John MURGATROYD, Hiroshi OKAMOTO

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Summary :

The effect of well number in 1.3 µm GaInAsP Graded-Index Separate-Confinement-Heterostructure Multiple-Quantum-Well (GRIN-SCH-MQW) laser diodes (LDs) is examined experimentally in terms of threshold current density Jth, differential quantum efficiency ηd and internal loss α. For LDs with cavity length L of 270 µm, Jth as low as 0.9 KA/cm2 was obtained with 5 quantum wells. ηd as high as 81% and α as low as 5 cm-1 were obtained with 4 quantum wells. Taking these parameters into account, 4 or 5 is calulated to be the optimum number of quantum wells for the present structure, which was confirmed experimentally. Light output power of 56 mW/facet with a narrow and circular output beam was obtained in a buried heterostructure (BH) GRIN-SCH-MQW LD entirely grown by Metalorganic Chemical Vapor Deposition (MOCVD). These results indicate that the use of a GRIN-SCH in a MQW LD of the GaInAsP/InP system is effective in the improvement of laser characteristics.

Publication
IEICE TRANSACTIONS on transactions Vol.E73-E No.1 pp.59-62
Publication Date
1990/01/25
Publicized
Online ISSN
DOI
Type of Manuscript
Special Section PAPER (Special Issue on International Conference on Integrated Optics and Optical Fiber Communication)
Category
Optical Semiconductor Devices and OEICs

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