Abstract
The optical feedback dynamics of two multimode InAs/GaAs quantum dot lasers emitting exclusively on sole ground or excited lasing states is investigated. The transition from long- to short-delay regimes is analyzed, while the boundaries associated to the birth of periodic and chaotic oscillations are unveiled to be a function of the external cavity length. The results show that depending on the initial lasing state, different routes to chaos are observed. These results are of importance for the development of isolator-free transmitters in short-reach networks.
Highlights
The transfer of massive amounts of information is no longer limited to optical long-distance transoceanic links or backbone networks
This work provides fundamental insight on the multimode optical feedback dynamics of InAs/GaAs quantum dot (QD) lasers emitting on different lasing states
The GS laser displays a strong resistance to optical perturbations without any chaotic pulsations whatever the measured external cavity length and feedback strength
Summary
The transfer of massive amounts of information is no longer limited to optical long-distance transoceanic links or backbone networks. New requirements in particular of the energy consumption showing trade-offs with data rates must be carefully considered in the design and operation of new generations of photonic devices [3, 4] Owing to their truly discrete energy states, InAs/GaAs quantum dot (QD) lasers offer superior continuouswave properties as compared to their quantum well (QW) counterparts [3,4,5,6,7]. Owing to the strong damping of the relaxation oscillations, GS lasing emission commonly exhibits a higher resistance to external optical feedback which is desired for laser stability and isolator-free applications [14, 15]. This work reports on comparative experiments dealing with the multimode optical feedback dynamics [14] of two InAs/GaAs QD Fabry-Perot (FP) lasers having identical active regions but emitting from different energy states. The present study brings a detailed understanding of the nonlinear dynamics of multimode QD lasers and is of paramount importance for the development of feedback resistant transmitters
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