4.1. A silica multimode step index fiber has a core refractive index of 1.46. Determine the optical loss in decibels due to Fresnel reflection at a fiber joint with: (a) a small air gap; (b) an index-matching epoxy which has a refractive index of 1.40. It may be assumed that the fiber axes and end faces are perfectly aligned at the joint. Ans. (a) 0.31 dB; (b) 3.8 x 10-4 dB
4.1. A silica multimode step index fiber has a core refractive index of 1.46. Determine the optical loss in decibels due to Fresnel reflection at a fiber joint with: (a) a small air gap; (b) an index-matching epoxy which has a refractive index of 1.40. It may be assumed that the fiber axes and end faces are perfectly aligned at the joint. Ans. (a) 0.31 dB; (b) 3.8 x 10-4 dB
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Transcribed Image Text:4.1. A silica multimode step index fiber has a core refractive index of 1.46. Determine
the optical loss in decibels due to Fresnel reflection at a fiber joint with:
(a) a small air gap;:
(b) an index-matching epoxy which has a refractive index of 1.40.
It may be assumed that the fiber axes and end faces are perfectly aligned at the joint.
Ans. (a) 0.31 dB; (b) 3.8 x 10-4 dB
4.2. The Fresnel reflection at a butt joint with an air gap in a multimode step index
fiber is 0.46 dB. Determine the refractive index of the fiber core.
Ans. 1.59
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