Method and apparatus for manufacturing distributed refractive in

Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Optical fiber – waveguide – or preform

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264 129, 264444, 425 71, 425 722, 4251742, B29D 1100

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active

060132051

ABSTRACT:
A plastic optical fiber is provided with a desired length and with a desired graded refractive index. To this end, a base polymer is first mixed with a non-polymerizable compound having a higher refractive index to obtain a fiber material. This material is then melted and continually spun into a fiber. The fiber is dipped into a polymerizable monomer and heated, during which both the non-polymerizable monomer and the polymerizable monomer diffuse inside the fiber, thereby grading the refractive index. When the fiber is heated, the diffused polymerizable monomer is polymerized and the fiber is hardened. The fiber is further coated with a cladding to form the desired plastic optical fiber. Various devices are provided for carrying out the above described processes.

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patent: 3999834 (1976-12-01), Ohtomo et al.
patent: 5541247 (1996-07-01), Koike
patent: 5593621 (1997-01-01), Koike et al.
patent: 5614253 (1997-03-01), Nonaka et al.
patent: 5639512 (1997-06-01), Nonaka et al.

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