Theoretical investigation of chirped mirrors in semiconductor lasers |
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Authors: | B Cakmak T Karacali S Yu |
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Institution: | (1) Engineering Faculty, Department of Electrical and Electronics, Ataturk University, 25240 Erzurum, Turkey;(2) University of Bristol, Room 4.21, Merchant Venturers Building, Woodland Road, Bristol, BS8 1UB, UK |
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Abstract: | This paper reports a theoretical design of chirped mirrors in 1.3-μm double-section semiconductor lasers to achieve high reflectivity
and dispersion compensation over a broad bandwidth. Analytic expressions for reflectivity, group delay and group delay dispersion
are derived. We use for the first time chirped air/semiconductor layer pairs as mirrors for higher-order dispersion compensation
in semiconductor lasers. Our optimised calculations demonstrate that the broad-band mirrors designed consist of a total of
only 12 air/semiconductor layers and achieve a reflectivity higher than 99.8%, a smooth group delay and almost stable dispersion
in the laser cavity over a 100-nm bandwidth. Due to a high index contrast of both types of the layers, n
l = 1, n
h~ 3.5, a high-reflectivity bandwidth of > 700 nm is obtained in 1.3-μm semiconductor lasers. We also compare our results with
that of a commercial simulation program and show a good agreement between them. As a conclusion, we assume from the theoretical
results that air/semiconductor layer pairs with varying thicknesses used at one end of double-section semiconductor lasers
can lead to femtosecond optical pulse generation using mode-locking techniques.
An erratum to this article can be found at . |
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Keywords: | 42 55 Px 42 79 Bh 78 20 Ci |
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