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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 16, Iss. 3 — Mar. 1, 1998
  • pp: 419–

Influence of a Nonuniform Coupling Coefficient on the Static and Large Signal Dynamic Behavior of Bragg-Detuned DFB Lasers

Thierry Fessant

Journal of Lightwave Technology, Vol. 16, Issue 3, pp. 419- (1998)

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A time domain model is used to study the large signal dynamics of general Bragg-detuned cavities. Such structures, in which the grating pitch is spatially nonuniform so that a distributed phase shift is produced along the cavity, are often called corrugation-pitch-modulated distributed feedback lasers (CPM-DFB). Furthermore, by introducing a longitudinally dependent coupling coefficient \kappa, a corrugation-pitch-modulated distributed-coupling-coefficient DFB laser (CPM-DCC-DFB) with quite different spectral properties can be realized. We present in this paper a comparison between these two kinds of components. It is shown that an adequate profile of the coupling coefficient (stronger coupling at the center of the cavity) in a CPM-DCC-DFB structure can help to achieve better steady-state singlemode operation with respect to conventional CPM-DFB lasers (uniform coupling coefficient). However, in CPM-DCC-DFB lasers, side modes are liable to be excited during the turn-on transient interval, thus imposing a limitation to the modulation depth requirement.


Thierry Fessant, "Influence of a Nonuniform Coupling Coefficient on the Static and Large Signal Dynamic Behavior of Bragg-Detuned DFB Lasers," J. Lightwave Technol. 16, 419- (1998)

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  1. B. S. K. Lo and H. Ghafouri-Shiraz, "Spectral characteristics of DFB laser diodes with distributed coupling coefficient," J. Lightwave Technol., vol. 13, pp. 200-212, Feb. 1995.

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