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Specialty Optical Fibers Handbook
book

Specialty Optical Fibers Handbook

by Alexis Mendez, T. F. Morse
December 2006
Intermediate to advanced
840 pages
28h 20m
English
Academic Press
Content preview from Specialty Optical Fibers Handbook
16.5.1 Couplers
A true evanescent field coupler can be made by two D-shape fibers positioned
flat-to-flat in comparison to the tapered optical fiber couplers with a small-
diameter pulled-down region acting as the core with a free space cladding. The
main advantages of the D-shape fiber couplers are that the light remains guided
completely in the cores and the guiding regions are completely enclosed. As a
result, there is no coupling dependence or loss due to the surrounding materials
[55, 56].
PM couplers are characterized by insertion loss, power split ratio, and extinc-
tion ratio. Practical PM couplers exhibit stable properties over temperature.
Performances of D-shape elliptical core couplers include less than 0.3-dB loss
and better than 25-dB
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Publisher Resources

ISBN: 9780123694065