Low-loss silica optical waveguides

Details Low-loss silica optical waveguides Low-loss silica optical waveguides

G - Physics

02

B

88/97.2

G02B 6/02 (2006.01) C03C 13/04 (2006.01) G02B 6/44 (2006.01)

Patent

CA 1270680

- 13 - LOW-LOSS SILICA OPTICAL WAVEGUIDES Abstract Certain dopant materials, when present in a significant power-carrying portion of a silica-based optical waveguide fiber, are effective as intrinsic loss reducing agents; the concentration of such dopant materials is at significantly lower levels as compared with levels used for producing a refractive index difference. Suitable in this respect are germania and phosphorus pentoxide as added to essentially pure silica or to silica containing other dopant additives such as, e.g., alumina or fluorine as may be used in a waveguiding core-cladding structure. Intrinsic loss in the vicinity of 0.2 dB/km is readily realized.

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