Narrowband filtering based on whispering gallery modes of a slightly tapered cylindrical optical microresonator was used to implement a tunable narrowband erbium-doped fiber laser. The laser can be set to emit a single longitudinal cavity mode (single frequency), although the laser cavity is a few meters long. In the single-frequency regime the laser can emit a maximum power of 0.380 mW with a linewidth <35 kHz and a signal-to-noise ratio exceeding 50 dB. Tunability is achieved by sliding the excitation point along the microcylinder. A tuning range of 1.16 nm is demonstrated.
© 2013 Optical Society of America
Original Manuscript: March 6, 2013
Revised Manuscript: April 15, 2013
Manuscript Accepted: April 15, 2013
Published: May 8, 2013
E. Rivera-Pérez, A. Díez, M. V. Andrés, J. L. Cruz, and A. Rodríguez-Cobos, "Tunable narrowband fiber laser with feedback based on whispering gallery mode resonances of a cylindrical microresonator," Opt. Lett. 38, 1636-1638 (2013)