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Improvements on Corrugation Pitch Modulated Distributed Coupling Coefficient Distributed Feedback Laser Structures for Single Longitudinal Mode Operation

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

Improvements on Corrugation Pitch Modulated Distributed Coupling Coefficient Distributed Feedback Laser Structures for Single Longitudinal Mode Operation, Proc International Conf. on Transparent Networks – Mediterranean Winter - ICTON MW, Ponta Delgada, Portugal, Vol. 1, pp. We.D5.4 - We.D5.4, July, 2009.

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Abstract
Optical communication systems depend heavily on the performance of the light emitter, usually a Distributed Feedback (DFB) laser. This paper presents optimised Corrugation-Pitch-Modulated (CPM) Distributed-Coupling-Coefficient (DCC) DFB laser structures specially designed for single longitudinal mode operation. The optimisation process is described and divided into two stages: near and above threshold. Near threshold, the purpose is the simultaneous maximisation of the normalised mode selectivity (S) and the minimisation of the electric field flatness (F). Above threshold, the power emission spectrum is assessed, as well as the Side Mode Suppression Ratio (SMSR). For the CPM-3DCC-DFB, S=2.54, F=0.019 and SMSR>48dB are achieved, which clearly outperforms similar laser structures proposed elsewhere.