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http://dx.doi.org/10.17703/JCCT.2020.6.3.419

Beam Profile Analysis of DFB Laser for High Speed Communications  

Kwon, Keeyoung (Division of Electrical, Electronic and Control Engineering, Kongju National University)
Publication Information
The Journal of the Convergence on Culture Technology / v.6, no.3, 2020 , pp. 419-425 More about this Journal
Abstract
In this paper, when a refractive index grating and a gain grating are simultaneously present in a DFB (Distributed Feedback) laser for a 1.55 um wavelength with two mirror surfaces without an anti-reflective coating, an analysis program was developed to determine the beam distribution of the oscillation mode in the longitudinal direction. As the phases of the index and gain gratings on the mirror faces are varied, the lasing gain and the beam profiles |R(z)| and |S(z)| of the lasing mode with the emitted power ratio Pl/Pr are analyzed and examined in case of δL<0. In order to reduce the threshold current of a oscillation mode and enhance the frequency stability, κL should be greater than 8, regardless of the grating phase values at the mirror surface.
Keywords
DFB laser; beam profile; grating phase; index grating; gain grating;
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Times Cited By KSCI : 3  (Citation Analysis)
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