Optical fibers and optical fiber amplifiers
AssigneeHoya Corporation
InventorsHiroaki Yanagita, Katsuhisa Itoh, Etsuko Hayashi, Hisayoshi Toratani
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Abstract
Disclosed are an optical fiber comprising a core and a cladding wherein the core is composed of a In-Ga-Cd-Pb halide glass and the clad composed of a halide glass possesses a refractive index of 1.515 or less, which has a large specific refractive index difference (.DELTA.n) and a large numerical aperture, and such an optical fiber as mentioned above wherein the core contains one or more activating ions as well as an optical fiber amplifier comprising a pumping source, a laser glass fiber and a means for introducing pumping light and signal light into the above laser glass fiber, wherein the laser glass fiber is the optical fiber of the present invention mentioned above.
Claims23
An optical fiber comprising a core and a cladding wherein the core is composed of a In-Ga-Cd-Pb halide glass and the cladding composed of a halide glass possesses a refractive index of 1.515 or less, and wherein the In-Ga-Cd-Pb halide glass contains, expressed in terms of mol %,
- In:
- 15-40%
- Ga:
- 15-40%,
- wherein In+Ga=35-65%,
- Cd:
- 5-40%,
- Pb:
- 10-30%,
- as cations constituting the glass and F or F and Cl as anions constituting the glass wherein the Cl content is 10% or less.
An optical fiber comprising a core and a cladding wherein the core is composed of a In-Ga-Cd-Pb halide glass and the cladding composed of a halide glass possesses a refractive index of 1.500 or less, and wherein the In-Ga-Cd-Pb halide glass contains, expressed in terms of mol %,
- In:
- 15-40%,
- Ga:
- 15-40%,
- wherein In+Ga=35-65%,
- Cd:
- 5-40%,
- Pb:
- 10-30%,
- as cations constituting thc glass and F or F and Cl as anions constituting the glass wherein the Cl content is 10% or less.
An optical fiber comprising a core and a cladding wherein the core is comprised of a In-Ga-Cd-Pb halide glass and the cladding is composed of a halide glass possessing a refractive index of about 1.5 or less, wherein said core glass is prepared from anhydrides of InF.sub.3, GaF.sub.3, CdF.sub.2, PbF, ZnF.sub.2, and LaF.sub.3, in a batch of about 20 InF.sub.3 -20 GaF.sub.3 -5 CdF.sub.2 -30 PbF, -21 ZnF.sub.2 -4 LaF.sub.3, expressed in terms of mol %, and said cladding glass is prepared from anhydrides of ZrF.sub.2, BaF.sub.2, LaF.sub.3, AlF.sub.3, and NaF, in a batch of about 53 ZrF2-20 BaF.sub.2 -4 LaF.sub.3 -3 AlF.sub.3 -20 NaF, expressed in terms of mol %.
Dependencies are inferred from the claim text.