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Proceedings Paper

Uncooled complex-coupled 1.55-um distributed feedback lasers with absorptive gratings
Author(s): Bernd Borchert
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Paper Abstract

Recently uncooled complex-coupled (CC) distributed feedback (DFB) lasers, i.e. where the Bragg grating provides both real and imaginary coupling, emerged as potential low-cost single-mode sources. For the imaginary coupling both gain gratings and absorptive gratings have been realized. In the following for the first time cw-operation of 1.55 micrometers CC- DFB lasers with an absorptive grating up to 115 degree(s)C is presented. The optimized grating structure consists of a conventional buried index grating and a thin n-doped InGaAs absorptive grating layer, both embedded in p-InP. The whole laser structure was grown by MOVPE on n-InP substrate, comprising strain-compensation in the active region. From the overgrown DFB structure 2 micrometers wide ridge-waveguide lasers with its simple fabrication technique were processed. For 350 micrometers long devices threshold currents around 15 mA and differential efficiencies up to 0.3 W/A were measured at 25 degree(s)C. The maximum output power at 85 degree(s)C was 20 mW, cw-operation was observed up to 115 degree(s)C. Preliminary small-signal modulation measurements indicate 3 dB- bandwidths around 16 (6) GHz at 25 degree(s)C (85 degree(s)C). All these characteristics are promising for using this 1.55 micrometers DFB type in a coaxial package without active temperature control.

Paper Details

Date Published: 2 May 1997
PDF: 6 pages
Proc. SPIE 3001, In-Plane Semiconductor Lasers: from Ultraviolet to Midinfrared, (2 May 1997); doi: 10.1117/12.273789
Show Author Affiliations
Bernd Borchert, Siemens AG (Germany)

Published in SPIE Proceedings Vol. 3001:
In-Plane Semiconductor Lasers: from Ultraviolet to Midinfrared
Hong K. Choi; Peter S. Zory, Editor(s)

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