Abstract

Tunable single-frequency semiconductor lasers are needed for applications in coherent optical systems: communications; optical sensors; spectroscopy. Desirable characteristics of lasers for heterodyne detection are a narrow linewidth combined with the ability to tune over a large wavelength range. In contrast to lasers for conventional communications. they should be directly frequency modulated (FM) over a large bandwidth without intensity modulation (IM). There is presently a need for a simple technique to monitor the tuning and coherence properties of such sources. We present an all-fiber interferometric apparatus that can be used to measure the tuning rate, range, and linearity of tuning as well as the laser linewidth in quasi-real time. The system was used to characterize cleaved coupled cavity (C3) lasers which-exhibit the above properties with varied bias currents, temperature, modulation frequency, and optical feedback levels. This technique could be used to characterize any of the variety of the two-section lasers recently proposed for tunability.1

© 1988 Optical Society of America

PDF Article

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