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Proceedings Paper

Gain-coupled DFB lasers for spectroscopic application
Author(s): Ryoichi Tohmon; Yoshio Takahashi; Hiroshi Mori; Tomoyuki Kikugawa
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Paper Abstract

Pure gain-coupled distributed feedback (DFB) lasers and complex-coupled DFB lasers, based on a current modulation concept is investigated. An n-doped current blocking layer is formed, either directly on top of the active region or on top of the InGaAsP index-modulation grating. The blocking layer causes a spatial modulation of the carrier concentration at the active region, forming a gain-grating. The blocking layer causes a spatial modulation of the carrier concentration at the active region, forming a gain- grating. The addition of the n-doped current blocking layer did not cause any deterioration in either the I-L or I-V curves. The stop band, which can be clearly observed in the index-coupled and the complex-coupled DFB lasers, cannot be distinguished in the pure gain-coupled DFB lasers, suggesting that the current blocking layer is sufficient to incorporate gain-coupling mechanism to the DFB lasers. The gain- and complex-coupled DFB lasers exhibit significant improvement in single model yield and susceptibility to optical feedback, compared to index-coupled DFB lasers. The concept is applied to the fabrication of DFB lasers at various wavelength from 1.3 to 1.7 micrometers .

Paper Details

Date Published: 26 February 1999
PDF: 10 pages
Proc. SPIE 3537, Electro-Optic, Integrated Optic, and Electronic Technologies for Online Chemical Process Monitoring, (26 February 1999); doi: 10.1117/12.341021
Show Author Affiliations
Ryoichi Tohmon, Anritsu Corp. (United States)
Yoshio Takahashi, Anritsu Corp. (Japan)
Hiroshi Mori, Anritsu Corp. (Japan)
Tomoyuki Kikugawa, Anritsu Corp. (Japan)


Published in SPIE Proceedings Vol. 3537:
Electro-Optic, Integrated Optic, and Electronic Technologies for Online Chemical Process Monitoring
Mahmoud Fallahi; Mahmoud Fallahi; Robert J. Nordstrom; Terry R. Todd, Editor(s)

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