A novel mode converter based on a hollow optical fiber is proposed to reduce the differential modal delay penalty in optical transmission over multimode fibers (MMFs). The device adiabatically converts a fundamental mode in a single-mode fiber to a ring-shaped mode in order to excite selectively a set of higher order modes with a similar group velocity in MMF, maintaining center-launching configuration. The mode converter is composed of serially concatenated concentric segments of a single-mode, hollow, and multimode optical fiber. For 2.5-Gb/s transmission over 500-m-long MMF using a laser diode transmitter, the proposed mode converter shows improvement in bit-error-rate performance at both wavelengths of 1.31 and 1.55 μm.
Bibliographical noteFunding Information:
Manuscript received May 1, 2001; revised September 18, 2001. This work was supported in part by UFON, an ERC program sponsored by KOSEF, BK21 supported by MOE, and ITRC-CHOAN Program in Korea S. Choi, K. Oh, W. Shin, C. S. Park, and U. C. Paek are with the Department of Information and Communications, Kwangju Institute of Science and Technology (K-JIST), 500-712 Kwangju, Korea (e-mail: email@example.com). K. J. Park and Y. C. Chung are with the Department of Electrical Engineering, KAIST, 305-701 Taejon, Korea. G. Y. Kim and Y. G. Lee are with the Optical Networking Technology Division, Access Network Laboratory, KT, 305-348 Taejon, Korea. Publisher Item Identifier S 1041-1135(02)00260-4.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering