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Contributions of both the ground and excited states in the degradation of the coherence collapse threshold in a quantum dash laser are analyzed. The excited states are found to strongly alter the device's feedback sensitivity.
The impact of optical feedback on the performance of a monolithic InAs/GaAs quantum dot passively mode-locked laser is experimentally investigated. We show that a feedback level greater than -25 dB can be detrimental to mode-locking operation.
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