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Proceedings Paper

Non-linear frequency tuning of long-wavelength VCSELs: phenomenological description
Author(s): A. Lytkine; W. Jäger; J. Tulip
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Paper Abstract

We have approximated with second-order polynomials the frequency tuning curves of long-wavelength single-mode VCSELs operating near 1654 and 1512 nm. Fitting coefficients were calculated using experimental data on injection currents and heat sink temperatures required to tune lasers to frequency markers generated by gas absorption lines. To measure temperature tuning rates, we tuned the lasers by temperature sequentially to pairs of absorption lines with known frequency separations. To determine fitting coefficients associated with linear and non-linear frequency tuning, we varied the laser injection currents and temperatures simultaneously in such a way that made a laser emit exactly the same frequency. Linear and non-linear tuning coefficients were then calculated from the data on effects of relatively small and large variation of laser operation parameters on laser frequency. Lasers were calibrated by tuning them on narrow absorption lines with frequencies accurately known from previous studies. The simulated tuning curves were demonstrated to fit frequency markers generated over spectral intervals up to 40 cm-1 with an accuracy of ± 0.10 cm-1(1654-nm laser) and ± 0.15 cm-1 (1512-nm laser). A temperature dependence of injection current tuning rates of the 1654-nm laser was determined from the best fits of simulated tuning curves to a series of CO2 absorption lines in the whole operation temperature range of the laser (0 - 50 °C). A simple and accurate method developed to describe tuning properties of long-wavelength VCSELs can be applied to quantitatively characterize any narrow-linewidth tunable laser.

Paper Details

Date Published: 21 April 2006
PDF: 8 pages
Proc. SPIE 6185, Micro-Optics, VCSELs, and Photonic Interconnects II: Fabrication, Packaging, and Integration, 61851A (21 April 2006); doi: 10.1117/12.663168
Show Author Affiliations
A. Lytkine, Univ. of Alberta (Canada)
W. Jäger, Univ. of Alberta (Canada)
J. Tulip, Univ. of Alberta (Canada)

Published in SPIE Proceedings Vol. 6185:
Micro-Optics, VCSELs, and Photonic Interconnects II: Fabrication, Packaging, and Integration
Hugo Thienpont; Mohammad R. Taghizadeh; Peter Van Daele; Jürgen Mohr, Editor(s)

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