Wide dynamic-range optical power control was achieved in a novel all-fiber device for a high-power Yb-doped fiber laser input using a serially cascaded fused tapered coupler pair. Torsional stress was independently applied over the coupling zones, which resulted in phase changes by photoelastic effects and subsequent linear shifts in transmission spectra. Dynamic range of 46 dB and low insertion loss below 1 dB were achieved for 1060-nm fiber laser with the incident fiber coupled power of 3.4 W. The detailed fabrication process of the device, characterization, and theoretical background are discussed.
Bibliographical noteFunding Information:
Manuscript received September 15, 2009; revised November 15, 2009; accepted November 15, 2009. First published December 01, 2009; current version published January 13, 2010. This work was supported in part by the KOSEF under Grant ROA-2008-000-20054-0 and Grant R15-2004-024-00000-0, in part by the KICOS under Grant 2009-8-1339 and Grant 2008-8-1893 (the European Community’s Seventh Framework Programme [FP7/2007-2013] under Grant agreement 219299, Gospel), in part by the ITEP under Grant 2008-8-1901 and Grant 2009-8-0809, and in part by the Brain Korea 21 Project of the KRF.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering