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Proceedings Paper

Semiconductor ring lasers subject to both on-chip filtered optical feedback and external conventional optical feedback
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Paper Abstract

It is well known that the performance of semiconductor lasers is very sensitive to external optical feedback. This feedback can lead to changes in lasing characteristics and a variety of dynamical effects including chaos and coherence collapse. One way to avoid this external feedback is by using optical isolation, but these isolators and their packaging will increase the cost of the total system.

Semiconductor ring lasers nowadays are promising sources in photonic integrated circuits because they do not require cleaved facets or mirrors to form a laser cavity. Recently, some of us proposed to combine semiconductor ring lasers with on chip filtered optical feedback to achieve tunable lasers. The feedback is realized by employing two arrayed waveguide gratings to split/recombine light into different wavelength channels. Semiconductor optical amplifier gates are used to control the feedback strength. In this work, we investigate how such lasers with filtered feedback are influenced by an external conventional optical feedback.

The experimental results show intensity fluctuations in the time traces in both the clockwise and counterclockwise directions due to the conventional feedback. We quantify the strength of the conventional feedback induced dynamics be extracting the standard deviation of the intensity fluctuations in the time traces. By using filtered feedback, we can shift the onset of the conventional feedback induced dynamics to larger values of the feedback rate [ Khoder et al, IEEE Photon. Technol. Lett. DOI: 10.1109/LPT.2016.2522184]. The on-chip filtered optical feedback thus makes the semiconductor ring laser less senstive to the effect of (long) conventional optical feedback. We think these conclusions can be extended to other types of lasers.

Paper Details

Date Published: 13 May 2016
PDF: 9 pages
Proc. SPIE 9891, Silicon Photonics and Photonic Integrated Circuits V, 98911X (13 May 2016); doi: 10.1117/12.2225630
Show Author Affiliations
Mulham Khoder, Vrije Univ. Brussel (Belgium)
Guy Van der Sande, Vrije Univ. Brussel (Belgium)
Jan Danckaert, Vrije Univ. Brussel (Belgium)
Guy Verschaffelt, Vrije Univ. Brussel (Belgium)

Published in SPIE Proceedings Vol. 9891:
Silicon Photonics and Photonic Integrated Circuits V
Laurent Vivien; Lorenzo Pavesi; Stefano Pelli, Editor(s)

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