Optical waveguides – With optical coupler – Input/output coupler
Patent
1995-10-19
1997-09-16
Ngo, John
Optical waveguides
With optical coupler
Input/output coupler
385 88, 385 85, 385147, 451 42, 451 43, 125 1301, G02B 636
Patent
active
056689020
ABSTRACT:
In a coupling structure for directly coupling a semiconductor laser to an optical fiber without using a lens, a coupling structure is provided which is superior in producibility, low in coupling loss and stable in operation of the semiconductor laser, by removing an influence of a return light due to Fresnel reflection from an end face of the optical fiber. A re-combination of the semiconductor laser to an active layer of the optical fiber is prevented by scattering a reflection light at the end face of the optical fiber by positively increasing a surface roughness Rz of the end face of the optical fiber to a range from 0.04 .mu.m to 0.06 .mu.m. The end face is formed by cutting the optical fiber with a blade saw having abrasive of particle size in a range from #1000 gauge to #2000 gauge corresponding to a range from 8 .mu.m to 20 .mu.m. The end face may be polished with abrasive having size in a rage from #1000 to #2000 gauge.
REFERENCES:
patent: 4639130 (1987-01-01), Koike et al.
patent: 4676231 (1987-06-01), Hisazaumi et al.
patent: 4786132 (1988-11-01), Gordon
patent: 4966429 (1990-10-01), Stephens et al.
patent: 5184433 (1993-02-01), Maack
NEC Corporation
Ngo John
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