# US 2004/0071418 A1 · Transmission optical fiber

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- Number: US 2004/0071418 A1
- Document ID: US20040071418A1
- Status: Published application
- Kind: A1
- Application number: 10/329,544
- Filed: 2002-12-27
- Published: 2004-04-15
- Earliest claimed: 2002-10-10
- Assignees: Electronics and Telecommunication Research Institute
- Inventors: Hong-Seok Seo; Yong Gyu Choi; Kyong Hon Kim
- Web page: https://patentgrep.com/patent/US20040071418A1

## CPC

- C03C 13/046: {Multicomponent glass compositions}
- G02B 6/02: Optical fibres with cladding {with or without a coating}
- G02B 6/02261: {Dispersion compensating fibres, i.e. for compensating positive dispersion of other fibres}
- G02B 6/02271: {Non-zero dispersion shifted fibres, i.e. having a small positive dispersion at 1550 nm, e.g. ITU-T G.655 dispersion between 1.0 to 10 ps/nm.km for avoiding nonlinear effects}
- H01S 3/0941: of a laser diode
- H01S 3/1691: {characterised by additives / sensitisers / promoters as further dopants}
- H01S 3/1695: {germanium}
- H01S 3/176: {silica or silicate glass}
- H01S 3/302: {in an optical fibre}
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL

## Abstract

The present invention relates to a transmission optical fiber. The transmission optical fiber including a core and a cladding made of SiO2 is characterized in that GeO2 and F are doped in SiO2 of the core and the cladding. Therefore, a high Raman gain coefficient could be obtained while a desired dispersion value and a non-linearity are maintained, by controlling the refractive index of the core and the cladding. Further, the pump power of the laser diode could be reduced and the cost of the laser diode could be lowered accordingly. In addition, the life of the laser diode is extended since the laser diode needs not to be operated at a high output.

## Claims

### Claim 1

A transmission optical fiber including a core and a cladding made of SiO2 is characterized in that:
GeO2 and F are doped in SiO2 of the core and the cladding.

### Claim 2 (depends on 1)

The transmission optical fiber as claimed in claim 1, wherein GeO2 of 3.0˜10 mol % and F of 0.1˜5 mol % are doped in SiO2 of the core.

### Claim 3 (depends on 1)

The transmission optical fiber as claimed in claim 1, wherein GeO2 of 0.1˜3 mol % and F of 0.05˜1.5 mol % are doped in SiO2 of the cladding.

### Claim 4 (depends on 1)

The transmission optical fiber as claimed in claim 1, wherein GeO2 and F are doped to SiO2 of the core and the cladding, in a range that the refractive index of the core is increase by 0.003˜0.015 and the refractive index of the cladding is reduced by −0.003˜0.0.