Abstract

Mode coupling coefficients were measured in a multimode step-index fiber at different steps of the process of manufacturing a multistrand optical fiber cable. It was established that the mode coupling coefficients of the unsheathed fiber were relatively small and nearly the same for all the guided modes. By sheathing with nylon and by multistranding, the mode coupling coefficients between lower-order modes increased rapidly due to microbends, while in the vicinity of the highest-order mode, they remained unchanged. From impulse response waveforms and baseband frequency responses, it was observed that mode mixing effects became more noticeable as the mode coupling coefficients increased. Also, it was found that the excess loss caused by microbends was relatively small.

© 1978 Optical Society of America

Mode coupling coefficient measurements in optical fibers

Kenichi Kitayama and Masahiro Ikeda
Appl. Opt. 17(24) 3979-3983 (1978)

Mode coupling effects in a graded-index fiber cable

Masaharu Ohashi, Ken-ichi Kitayama, and Shigeyuki Seikai
Appl. Opt. 20(14) 2433-2438 (1981)

Transmission characteristics of multimode W-type optical fiber: experimental study of the effect of the intermediate layer

K. Mikoshiba and H. Kajioka
Appl. Opt. 17(17) 2836-2841 (1978)

Measurement of mode conversion coefficients and mode dependent losses in a multimode fiber

Mitsunobu Miyagi, Shojiro Kawakami, Masaharu Ohashi, and Shigeo Nishida
Appl. Opt. 17(20) 3238-3244 (1978)

Single-mode optical fiber cable

Yutaka Katsuyama, Satoshi Mochizuki, Koushi Ishihara, and Tadashi Miyashita
Appl. Opt. 18(13) 2232-2236 (1979)