Fiber high-bandwidth

Polymer optical fibers (POFs) combine a lot of very attractive properties like high bandwidth, total EMF immunity, and ease of handling. The focus of POF development has been in Japan, mainly driven by inventions of the group of Koike/Keio University and three companies, namely, Mitsubishi Rayon, To ray, and Asahi, which dominate the world market. The developments in the U.S.A. and Europe, on the other hand, are restricted mainly to the areas of POF compatible emitters and receivers and POF transmission systems, mainly for industrial production lines, automated wiring, and home wiring. 

The optimum refractive-index distribution of the high bandwidth graded-index polymer optical fiber (GI POP) was clarified by consideration of both modal and material dispersions. The ultimate bandwidth achieved by the POP is investigated by a quantitative estimation of the material dispersion as well as the modal dispersion. 

Since all commercially available POF have been of the step-index (SI) type, the modal dispersion limits the possible bit rate of POF links to less than 100 megabit per second (Mb/s). Because of this, it has been thought that POF cannot be utilized for high speed transmission medium. Recently, however, we proposed a large core, low loss, and high bandwidth graded-index polymer optical fiber (GI POF) (7,2) for the first time and we confirmed that 2.5 Gb/s signal transmission for 100 m distance was possible in the GI POF (2,5). 

Nihei, E. Ishigure, T Koike, Y. Optimization of Modal and Material Dispersions in High-Bandwidth Graded-lndex Polymer Optical Fibers, in Photonic and Optoelectronic Polymers Jenekhe, S. A. Wyrme, K. T., Eds. ACS Symposium Series, American Chemical Society Washington DC, 1997 Vol. 672, pp 58-70. 

FIGURE 16 Additive pulse mode-locked laser. The output of the color center laser is coupled to an optical fiber. Self-phase modulation in the fiber adds bandwidth to the pulse, which is coupled back to the laser. The combination produces femtosecond-duration pulses. (OC, output coupler BS, beam splitter BTP, birefringent tuner plate HR, high reflector PZT, piezotransducer). 

E., and Koike, Y. (1994) Low-loss high-bandwidth Gi polymer optical fiber. Advanced Materials 93 Proceedings of the Symposia, Vol. 15A, pp. 181-184. 

Koike Y., Ishigure T., Eisuke N. / High-Bandwidth graded-index polymer Optical Fiber. HJournal of lightwave technology, 1995, vol.13, No 7, pp. 1475-1489. 

Low loss and high bandwidth polystyrene-based graded index polymer optical fiber. / Lightwave Technol., 31 (14), 2407. 

Koike, Y. and Ishigure, T. (2006) High-bandwidth plastic optical fiber for fiber to the display. J. Lightwave Technol, 24 (12), 4541-4553. 

Koike, Y. and Koike, K. (2011) Progress in low-loss and high-bandwidth plastic optical fibers. /. Polym. Sci. B, 49 (1), 2-17. 

Asai, M., Inuzuka, Y, Koike, K., Takahashi, S., and Koike, Y. (2011) High-bandwidth graded-index plastic optical fiber with low-attenuation, high-bending ability, and high-thermal stability for home-networks. /. Lightwave Technol, 29 (11), 1620-1626. 

Low-loss, high-bandwidth graded-index plastic optical fiber fabricated by the centrifugal deposition method. Appl. 

The first low-loss and high-bandwidth 61-127 channel graded-index steric cores polymer waveguide. Optical Fiber Communication Conference, San Diego,... 

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