28 April 2016 Dynamics of semiconductor microring lasers subject to on-chip filtered optical feedback
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Tunable laser diodes are needed in a range of applications including wavelength division multiplexing, optical instrument testing, optical sensing and tera hertz generation. In this work, we investigate the stability of lasers which use filtered optical feedback for wavelength tuning. We investigate experimentally the dynamics induced by this on-chip filtered optical feedback.

In this study, we choose to use a compact device which combines a semiconductor ring laser with on-chip filtered optical feedback to achieve wavelength tunability. The filtered optical feedback is realized by employing two arrayed waveguide gratings to split/recombine light into different wavelength channels. Semiconductor optical amplifiers are placed in the feedback loop in order to control the feedback of each wavelength channel independently.

Experimental observations show that the stability of the clockwise and counterclockwise propagation modes depends on the feedback strength. Experiments also show that for a specific range of the feedback strength, anti-phase oscillations in the intensity of the clockwise and counterclockwise propagating modes can be induced. These oscillations could not be seen in the same semiconductor ring laser without filtered optical feedback. We investigate how the frequency and the amplitude of these oscillations change under the effect of filtered optical feedback. We also discuss how these anti-phase oscillations can be suppressed by properly choosing the feedback strength.
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Mulham Khoder, Mulham Khoder, Gaetan Friart, Gaetan Friart, Jan Danckaert, Jan Danckaert, Thomas Erneux, Thomas Erneux, Guy Van der Sande, Guy Van der Sande, Guy Verschaffelt, Guy Verschaffelt, "Dynamics of semiconductor microring lasers subject to on-chip filtered optical feedback", Proc. SPIE 9892, Semiconductor Lasers and Laser Dynamics VII, 98921J (28 April 2016); doi: 10.1117/12.2225627; https://doi.org/10.1117/12.2225627

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