Optical waveguides – With optical coupler – Input/output coupler
Patent
1997-06-10
1999-02-02
Sanghavi, Hemang
Optical waveguides
With optical coupler
Input/output coupler
385123, 385128, G02B 634
Patent
active
058676180
ABSTRACT:
This invention relates to an optical fiber grating and a method of manufacturing the same. According to the method, a hydrogen doping process is performed before ultraviolet irradiation in order to obtain a sufficient photoinduced refractive index change. In particular, a target for the hydrogen doping process of the method is characterized by a coated fiber obtained by covering the outer surface of the bared fiber having a core region and a cladding region with the resin. After the coated fiber is exposed in a hydrogen atmosphere in a predetermined pressurized state for a predetermined period of time, the resin is partially removed. An ultraviolet ray is irradiated on the predetermined area of the bared fiber from which the resin is removed, thereby forming a reflection grating in the core region. The method is also characterized in that the pressure of the hydrogen atmosphere is reduced from the pressurized state while adjusting the pressure reducing rate. Degradation of the bared fiber surface can be prevented, and generation of bubbles or the like between the bared fiber and the resin coating can also be prevented, thereby obtaining an optical fiber grating with high reliability.
REFERENCES:
patent: 5351321 (1994-09-01), Snitzer et al.
patent: 5633966 (1997-05-01), Nakaishi
patent: 5745615 (1998-04-01), Atkins et al.
Enomoto Tadashi
Ikeji Maki
Ito Masumi
Sanghavi Hemang
Sumitomo Electric Industries Ltd.
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