We report a tunable all-fiber bandpass filter based on a short hollow optical fiber serially concatenated between a pair of long-period fiber gratings. With novel core mode blocking in the hollow core fiber and its optimal design, the device showed a low insertion loss of 1.5 dB and broad-band passband tuning range of 84.3 nm covering both S- and C-band.
Bibliographical noteFunding Information:
Manuscript received June 11, 2004; revised August 5, 2004. This work was supported in part by the KOSEF through the UFON Research Center, in part by the MOE through the BK21 program, and in part by ITRC-CHOAN program.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering