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Proceedings Paper

The effect of grating structure on relative intensity noise in DFB laser diode
Author(s): Ebrahim Mortazy; Fatemeh Shahshahani; Vahid Ahmadi; Amirhossein Tehranchi; Mohammad Kazem Moravvej-Farshi
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Paper Abstract

In this paper, we present the effect of grating structure on Relative Intensity Noise (RIN) in Distributed Feedback (DFB) laser diode. We analyze the noise in three types of grating shape including longitudinally uniform, concave and convex depth. It is shown that the concave grating against uniform and convex structure is suitable for reducing the Spatial Hole Burning (SHB) effect, but is not appropriate for low noise DFB lasers. According to the results of analysis, in uniform grating, RIN decreases when the corrugation depth increases. In concave and convex structure, grating depth is composed of fixed and variable parts. When fixed part of grating depth is constant, increasing variable amplitude of grating reduces RIN and when the variable part of grating is constant, increasing fixed part of grating reduces RIN. In all of the three type structures, RIN for the symmetric grating is lowest. Also with decreasing RIN, relaxation oscillation frequency decreases and when the SHB effect occurs, the rate of this decreasing is low. We conclude a special shape of grating that has low SHB effect and low noise in optical communication systems.

Paper Details

Date Published: 25 May 2004
PDF: 11 pages
Proc. SPIE 5468, Fluctuations and Noise in Photonics and Quantum Optics II, (25 May 2004); doi: 10.1117/12.546840
Show Author Affiliations
Ebrahim Mortazy, Iran Telecom Research Ctr. (Iran)
Fatemeh Shahshahani, Alzahra Univ. (Iran)
Vahid Ahmadi, Tarbiat Modarres Univ. (Iran)
Atomic Energy Organization of Iran (Iran)
Amirhossein Tehranchi, Iran Telecommunication Research Ctr. (Iran)
Mohammad Kazem Moravvej-Farshi, Iran Telecom Research Ctr. (Iran)
Tarbiat Modarres Univ. (Iran)


Published in SPIE Proceedings Vol. 5468:
Fluctuations and Noise in Photonics and Quantum Optics II
Peter Heszler, Editor(s)

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