Abstract
We report the experimental observation of periodic dark pulse emission in a quantum-well semiconductor laser with delayed optical feedback. We found that under appropriate operation conditions the laser can also emit a stable train of dark pulses. The repetition frequency of the dark pulse is determined by the external cavity length. Splitting of the dark pulse was also observed. We speculate that the observed dark pulse is a kind of temporal cavity soliton formed in the laser.
Highlights
Periodic dark pulse emission induced by delayed feedback in a quantum well semiconductor laser
It has been shown that as a result of the delayed feedback, the lasers can exhibit a variety of interesting features, including the destabilization of relaxation oscillations,[6,7,8,9] coherence collapse,[10] and low-frequency fluctuations (LFF) or dropouts.[1,11]
Carroll et al reported a kind of stable dark pulse emission from a quantum dot (QD) laser induced by the optical feedback from a distant reflector.[15]. It was considered as a unique property of the QD semiconductor lasers
Summary
Periodic dark pulse emission induced by delayed feedback in a quantum well semiconductor laser When the cavity length was 37.5 cm, the repetition rate of the dark pulses was about 400 MHz (Fig. 5(a)).
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