Tunable erbium-doped fiber ring laser based on coupling between side-polished fiber and sliding tapered planar waveguide

A tunable erbium-doped fiber ring laser was made using a tunable side-polished fiber (SPF) filter with a tapered planar waveguide (PWG). The thickness of the tapered PWG varied because it slides laterally on the side-polished region. The proposed SPF filter does not need additional physical energy after resonant wavelength selected. Tuning direction of SPF filter is not limited. In addition, the proposed SPF filter can change the tuning resolution by changing the tapered angle of PWG. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 887–889, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22273