Abstract
It is well known that semiconductor distributed feedback lasers (DFB) are key devices for optical communications. However direct modulation applications are limited by the frequency chirp induced by current modulation. We demonstrate that a proper external control laser operation leads to chirp-to-power ratio (CPR) stabilization over a wide range of modulation frequencies as compared to the free-running case. Under experimentally selected optical feedback conditions, the CPR decreases significantly in the adiabatic regime from about 650 MHz/mW in the solitary case down to 65 MHz/mW. Experimental results are also confirmed by numerical investigations based on the transfer matrix method. Simulations point out the possible optimization of the CPR in the adiabatic regime by considering a judicious cavity design in conjunction with a proper external control. These results demonstrate important routes for improving the transmission performance in optical telecommunication systems.
Highlights
Today, lower cost and lower consumption optical sources are required for the deployment of access and metropolitan networks and for supporting new services like HDTV (HighDefinition television), VOD (Video-On-Demand) as well as Cloud-computing
We demonstrate that a proper external control laser operation leads to chirp-to-power ratio (CPR) stabilization over a wide range of modulation frequencies as compared to the free-running case
The chirp induced by the optical modulation of a quantum well (QW) distributed feedback lasers (DFB) diode laser is evaluated through the measurement of the CPR
Summary
Lower cost and lower consumption optical sources are required for the deployment of access and metropolitan networks and for supporting new services like HDTV (HighDefinition television), VOD (Video-On-Demand) as well as Cloud-computing. The impact of the different feedback regimes in semiconductor laser’s nonlinear dynamic has led to a wide range of theoretical and experimental papers, none of them have investigated really the relationship between the CPR and the laser linewidth enhancement factor. To this end, let us cite a theoretical work [14] in which the control of the CPR with self-injection was explicitly pointed out. The Bragg grating coefficient as well as the facets reflectivities is shown to influence the adiabatic CPR magnitude
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