Optical fiber having a core with a repeatedly changing constitut

Optical waveguides – Optical fiber waveguide with cladding

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385146, G02B 602

Patent

active

052673391

ABSTRACT:
The present invention is directed to an optical fiber comprising a core and a cladding layer wherein at least one of the constitutional parameters thereof changes along the longitudinal direction of the optical fiber. In order to present a useful optical fiber wherein the occurrence of a Brillouin scattering is prevented, an optical fiber having altered constitutional parameters is found to be effective. The constitutional parameters mean the parameters which determine the constitution of the optical fiber and is capable of influencing the condition of electromagnetic wave transmitting therethrough such as light or acoustic wave. The constitutional parameters include diameter of the core, index of refraction of the core, diameter of the optical fiber, composition of the glass, residual stress of the core. Some examples are disclosed about their manufacturing process and the test results. Much improvement was measured, especially in the use for a single mode optical fiber.

REFERENCES:
patent: 3966446 (1976-06-01), Miller
patent: 4163370 (1979-08-01), Kurth
patent: 4447124 (1984-05-01), Cohen
patent: 4573163 (1986-02-01), Kaminow
patent: 4665660 (1987-05-01), Jablonski et al.
patent: 4933815 (1990-06-01), Parthasarathy
patent: 5151966 (1992-09-01), Brehm et al.

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