Wavelength tuning characteristics of a fabry-perot semiconductor laser with an external short cavity |
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| Authors: | Masakatsu Okada Bijan Ghafary Hiroo Ukita |
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| Institution: | (1) Department of Photonics, Ritsumeikan University, 1- 1- 1, Noji- Higashi, 525- 8577 Kusatsu, Shiga, Japan;(2) Present address: Department of Physics, Iran University of Science and Technology, Narmak, Tehran, Iran |
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| Abstract: | Wavelength tuning characteristics of a Fabry-Perot semiconductor laser with an external short cavity are analyzed, in which
the oscillation wavelength can be changed by slightly altering the external cavity length. Analysis is based on rate equations
for an optical power and carrier density. It is shown that the wavelength tuning range is dominated by a change of carrier
density through the effect of carrier-induced refractive index change in the active layer of a laser diode. This depends on
effective coupling coefficients of the optical field iteratively reflected back to the laser diode by the external mirror,
and on reflection coefficients of an anti-reflection coated laser facet and the external mirror which compose the external
cavity. The effective coupling coefficient is also derived using the waveguide theory and Kirchhoff ’s theory. Finally, an
unstable condition which may limit a stable wavelength tuning range is shown by results of a linear stability analysis of
rate equations. |
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| Keywords: | tunable laser diode short coupled cavity coupling coefficient of reflected optical field tuning range carrier-induced refractive index change stability analysis |
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