111 research outputs found
Analysis of self-pulsating three-section DBR lasers
No full textThe characteristics of a three-section distributed Bragg reflector laser showing self-pulsation have been analyzed using a large signal time-domain traveling-wave simulator. The device dynamic properties have been investigated in all their complexity and analyzed as functions of the linewidth enhancement factor and of the injected current in the active and in the phase control sections. The simulation results have clearly shown the fundamental role of four wave mixing on the laser characteristics (output power, spectrum, etc.) and have been quantitatively correlated with the few available theoretical and experimental results. The considered self-pulsation operation frequencies around 40 GHz are of interest for practical applications
Design and simulation of quantum-dot-based push-pull DFB lasers
No full textWe present an analysis of Quantum Dot (QD) based Push-Pull modulated DFB (PP-DFB) laser, showing enhanced small and large signal modulation bandwidth thanks to the interaction between two longitudinal cavity modes. Using an analysis of the cavity modes at threshold, we propose a simple yet effective design technique which allow to select the cavity length and the coupling coefficient to obtain the desired extension of the modulation bandwidth. The design is validated using a Time Domain Travelling Wave (TDTW) model including a proper description of the Quantum Dot material and of the standing wave pattern generated by the cavity field. Our results show that QD PP-DFB can effectively take advantage of the Push-Pull modulation scheme to increase their modulation bandwidth
Design and Simulation of Self-pulsating Semiconductor Lasers for Very High Speed Clock Recovery
No full textTunable Two Section DBR Lasers for ITU Frequency Standard
No full textThe paper deals with the description of a simulation procedure for the design and the optimization of tunable multi-section distributed Bragg reflector (DBR) lasers. In particular a special attention is dedicated to the design of two-section DBR lasers with operating wavelengths matching the ITU frequency standard grid only by grating current tuning. To our knowledge this is the first time that by a proper design procedure this condition has been satisfied
A Vectorial Finite Difference Scheme for Longitudinal Invariant Guiding Environments: Transverse Electric Field Representation
No full textDesign and simulation of DBR lasers with extended modulation bandwidth exploiting photon-photon resonance effect
No full textIn high-speed laser devices the occurrence of a pho-ton-photon resonance increases the modulation bandwidth sub-stantially. In this paper our attention is focused on the design of DBR lasers in which this effect is exploite
A Fast Time Domain Travelling Wave simulator for Quantum Dot Lasers and Amplifiers
No full textWe present a Finite Difference Travelling Wave (FDTW) approach for the simulation of various quantum dot devices: lasers, semiconductor optical amplifiers and superluminescent light emitting diodes
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