Abstract

Bending effects on bandwidth and loss of a graded-index polymer optical fiber (GI POF) were investigated, and those influences on the optical link performance were discussed simultaneously for the first time. The numerical apertures (NAs) of the GI POFs were deliberately varied from 0.154 to 0.292. A bending radius larger than 10 mm induced little mode coupling and little change in the bandwidth of the GI POF. A bending radius smaller than 10 mm caused degradation in the bandwidths of the higher NA GI POFs. On the other hand, in the lower NA GI POFs, even more severe bending could cause little change in their bandwidths. Thus, the lower NA GI POF seemed preferable in suppressing the bandwidth change. However, the higher NA GI POF exhibited the lower bending loss. The preferable NAs for both characteristics were completely opposite. Moreover, the bending loss under underfilled launch (UFL) could be lower than that under overfilled launch (OFL). On the other hand, the bending loss was equivalent to the bandwidth degradation in view of the link power penalty. Therefore, the bandwidth change and loss caused by the bending were the critical factors to optimize the optical link considering the link power budget. The high-NA GI POF with almost ideal refractive-index profile could provide stable high performance in overgigabit communication even under any bending conditions.

© 2005 IEEE

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Appl. Opt. (1)

Other (16)

T. Ishigure, H. Endo and Y. Koike, "High-bandwidth plastic optical fiber with W-refractive index profile", IEEE Photon. Technol. Lett., vol. 16, no. 9, pp. 2081-2083, Sep. 2004.

D. G. Cunningham and W. G. Lane, Gigabit Ethernet Networking, New York: Macmillan, 1999.

in"Proc. 13th Int. Plastic Optical Fiber Conf.", Nurnberg, Germany,Sep. 2004.

T. Ishigure, E. Nihei and Y. Koike, "Graded-Index polymer optical fiber for high speed data communication", Appl. Opt., vol. 33, no. 19, pp. 4261 -4266, 1994.

T. Ishigure, M. Sato, O. Takanashi, E. Nihei, T. Nyu, S. Yamazaki and Y. Koike, "Formation of the refractive index profile in the graded index polymer optical fiber for gigabit data transmission", J. Lightw. Technol., vol. 15, no. 11, pp. 2095-5100, Nov. 1997.

T. Ishigure, Y. Koike and J. W. Fleming, "Optimum index profile of the perfluorinated polymer based GI polymer optical fiber and its dispersion properties", J. Lightw. Technol., vol. 18, no. 2, pp. 178-184, Feb. 2000.

M. C. Nowell and D. G. Cunningham, "Evaluation of Gb/s laser based fiber LAN links: Review of the Gigabit Ethernet model", Optical Quantum Electron., vol. 32, pp. 169-192, 2000.

L. Raddatz, I. H. White, D. G. Cunningham and M. C. Nowell, "An experimental and theoretical study of the offset launch technique for the enhancement of the bandwidth of multimode fiber links", J. Lightw. Technol., vol. 16, no. 3, pp. 324-331, Mar. 1998.

T. Ishigure, E. Nihei and Y. Koike, "Optimum refractive index profile of the graded-index polymer optical fiber, toward gigabit data links", Appl. Opt., vol. 35, no. 12, pp. 2048-2053, 1996.

T. Ishigure, S. Tanaka, E. Kobayashi and Y. Koike, "Accurate refractive index profiling in a graded-index plastic optical fiber exceeding gigabit transmission rates", J. Lightw. Technol., vol. 20, no. 8, pp. 1449-1456, Aug. 2002.

D. Marcuse, "Coupled mode theory of round optical fiber", Bell Syst. Tech. J., vol. 52, no. 6, pp. 817-42, 1973.

Y. Koike, E. Nihei and T. Ishigure, "High-Bandwidth, low-loss graded-index polymer optical fiber", in Proc. Eur. Conf. Optical Communications (ECOC 1998) , Madrid, Spain, 1998, pp. 231-232.

T. Ishigure, K. Makino, S. Tanaka and Y. Koike, "High-Bandwidth graded-index polymer optical fiber enabling power penalty-free gigabit data transmission", J. Lightw. Technol., vol. 21, no. 11, Nov. 2003.

"Launched Power Distribution Measurement Procedure for Graded-Index Multimode Fiber Transmitters", FOTP-203, TIA/EIA-455-203, 2001.

K. Ohdoko, T. Ishigure and Y. Koike, "Propagating mode analysis and design of waveguide parameters of GI POF for very short-reach network use", IEEE Photon. Technol. Lett., vol. 17, no. 1, pp. 79-81, Jan. 2005.

H. F. Taylor, "Bending effects in optical fibers", J. Lightw. Technol., vol. 2, no. 10, pp. 617-628, Oct. 1984.

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