Title :
Analytical Method for Calculation of the Photon Lifetime and External Coupling Coefficient in Index-Coupled Phase-Shifted DFB Lasers
Author :
Topic, Vladimir J. ; Crnjanski, Jasna V. ; Krstic, Marko M. ; Totovic, Angelina R. ; Gvozdic, Dejan M.
Author_Institution :
Sch. of Electr. Eng., Univ. of Belgrade, Belgrade, Serbia
Abstract :
An analytical expression for the photon lifetime in index-coupled distributed feedback laser is derived and studied at, and below, the threshold condition. It is shown that the photon lifetime considerably varies with the frequency detuning in the vicinity of the dominant laser mode. The increase in the structural parameters, such as grating coupling constant and length of the DFB structure, leads to the increase in both the photon lifetime and the magnitude of its variation due to frequency detuning, while the increase in material gain has the opposite effect. The spectral dependence of the photon lifetime has important implications on calculation of the external coupling coefficient of DFB lasers.
Keywords :
diffraction gratings; distributed feedback lasers; laser modes; semiconductor lasers; external coupling coefficient; frequency detuning; grating coupling constant; index-coupled distributed feedback laser; index-coupled phase-shifted DFB lasers; laser mode; material gain; photon lifetime; spectral dependence; structural parameters; Cavity resonators; Couplings; Distributed feedback devices; Laser modes; Photonics; Silicon; Coupling coefficient; distributed feedback (DFB); distributed feedback (DFB) lasers; injection-locking; lasers; photon lifetime;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2015.2445493
