Creating and sharing knowledge for telecommunications

Near Threshold Regime Optimization of a Corrugation-Pitch-Modulated DFB Laser Structure with Inhomogeneous Coupling Coefficient

Boavida, J.M. ; Fernandes, C. F. ; Morgado, J.

Near Threshold Regime Optimization of a Corrugation-Pitch-Modulated DFB Laser Structure with Inhomogeneous Coupling Coefficient, Proc Conf. on Telecommunications - ConfTele, St Maria da Feira, Portugal, Vol. 1, pp. 343 - 346, May, 2009.

Digital Object Identifier:

Abstract
A numerical procedure for the accurate optimization of a corrugation-pitch-modulated (CPM) distributed-coupling-coefficient (DCC) distributed-feedback (DFB) laser structure is described. The optimization criteria regard the main figures of merit concerning the laser single longitudinal mode operation: the normalized mode selectivity S and the flatness F. The normalized threshold gain alfath is also assessed. A step-by-step description of the numerical method, based in matrix techniques, is presented.
S=2.18 and F=0.017, with alfathL=1.42 are achieved for the optimized CPM-DCC-DFB laser structure, which strongly improves the performance reported elsewhere relative to optima designs for other modified DFB structures.