Optical waveguides – With optical coupler – Particular coupling structure
Patent
1995-06-28
1997-09-23
Bovernick, Rodney B.
Optical waveguides
With optical coupler
Particular coupling structure
385 9, G02B 626, G02B 642
Patent
active
056713096
ABSTRACT:
The object of the present invention is to provide a wide-band optical fiber coupler whose light-branching ratio is independent of the wavelength of light rays to be transmitted therethrough as well as a method for preparing the wide-band optical fiber coupler. When an optical fiber 1 having zero-dispersion at 1.55 .mu.m band and an optical fiber 2 having zero-dispersion at 1.3 .mu.m band are fused and drawn to form a coupled portion 3, a light beam 15 is incident upon the optical fiber 2 and the intensity of the light beam outgoing through either of these optical fibers 2 or 1 is measured to detect the light-branching ratio observed at the coupled portion 3. The drawing operation is interrupted at an instance when the detected light-branching ratio falls within the range of 50.+-.5%.
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Abe Jun
Koya Kazuo
Shirota Masaaki
Bovernick Rodney B.
Shin-Etsu Chemical Co. , Ltd.
Wise Robert E.
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