Abstract

Square-wave (SW) switching of the lasing direction in a semiconductor ring laser (SRL) is investigated using counter-directional mutual feedback. The SRL is electrically biased to a regime that supports lasing in either counter-clockwise (CCW) or clockwise (CW) direction. The CCW and CW modes are then counter-directionally coupled by optical feedback, where the CCW-to-CW and CW-to-CCW feedback are delayed by τ1 and τ2, respectively. The mutual feedback invokes SW oscillations of the CCW and CW emission intensities with a period of Tτ1+τ2. When τ1=τ2, symmetric SWs with a duty cycle of 50% are obtained, where the switching time and electrical linewidth of the SWs can be reduced to, respectively, 1.4 ns and 1.1 kHz by strengthening the feedback. When τ1τ2, asymmetric SWs are obtained with a tunable duty cycle of τ1/(τ1+τ2). High-order symmetric SWs with a period of T=(τ1+τ2)/n can also be observed for some integer n. Symmetric SWs of order n=13 with a period of T=10.3  ns are observed experimentally.

© 2016 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Square-wave oscillations in semiconductor ring lasers with delayed optical feedback

Lilia Mashal, Guy Van der Sande, Lendert Gelens, Jan Danckaert, and Guy Verschaffelt
Opt. Express 20(20) 22503-22516 (2012)

All-optical controlled switching between time-periodic square waves in diode lasers with delayed feedback

Gaetan Friart, Guy Verschaffelt, Jan Danckaert, and Thomas Erneux
Opt. Lett. 39(21) 6098-6101 (2014)

Experimental investigation on feedback insensitivity in semiconductor ring lasers

Song-Sui Li, Vincenzo Pusino, Sze-Chun Chan, and Marc Sorel
Opt. Lett. 43(9) 1974-1977 (2018)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription