A new fiber structure optical fiber amplifier was reported where the core was doped with erbium (Er) and the inner-cladding was doped with samarium (Sm). Feasibility of gain control by evanescent wave interaction with an absorbing material in the inner-cladding was experimentally demonstrated. The optical amplifier using the proposed fiber resulted in the gain variation between gain peak and valley less than 2.5 dB without using external gain equalizing filters.
Bibliographical noteFunding Information:
Manuscript received February 22, 2000; revised May 2, 2000. This work was supported in part by UFON, an ERC program in K-JIST sponsored by KOSEF and the BK21 Program. The authors are with the Department of Information and Communications, Kwangju Institute of Science and Technology, Kwangju 500-712, Republic of Korea (e-mail: email@example.com). Publisher Item Identifier S 1041-1135(00)06275-3.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering