Parameter extraction from subthreshold spectra in cleaved gain- and index-coupled DFB LDs

Geert Morthier; Geert Morthier; Kenji Sato; Roel Baets; Roel Baets; Tsurugi K. Sudoh; Yoshiaki Nakano; Kunio Tada

doi:10.1364/OFC.1995.FC3

Optical Fiber Communications Conference
1995 OSA Technical Digest Series (Optica Publishing Group, 1995),
paper FC3
•https://doi.org/10.1364/OFC.1995.FC3

Parameter extraction from subthreshold spectra in cleaved gain- and index-coupled DFB LDs

Geert Morthier, Kenji Sato, Roel Baets, Tsurugi K. Sudoh, Yoshiaki Nakano, and Kunio Tada

Optical Fiber Communication Conference 1995

San Diego, California United States
ISBN: 1-55752-385-1

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Distributed-Feedback Lasers (FC)

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G. Morthier, K. Sato, R. Baets, T. K. Sudoh, Y. Nakano, and K. Tada, "Parameter extraction from subthreshold spectra in cleaved gain- and index-coupled DFB LDs," in Optical Fiber Communications Conference, Vol. 8 of 1995 OSA Technical Digest Series (Optica Publishing Group, 1995), paper FC3.

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Abstract

Determination of device parameters in fabricated distributed-feedback (DFB) laser diodes (LDs) is very important for further optimization of the laser design and even the system design. In particular, the coupling coefficient is one of the most influential parameters, and hence it should be measured precisely. However, to date, the determination of the coupling coefficient in DFB lasers has been possible only for indexcoupled devices with antireflection-coated facets and has not been very accurate.¹ Moreover, in such measurements no other parameters, such as gain and effective group index, could be derived.

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