Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for treating optical fiber

A processing method and optical fiber technology, applied in the directions of cladding optical fibers, light guides, optics, etc., can solve the problems such as the determination method that does not mention the absorption peak, the inability to effectively judge the absorption peak, and the lack of records of the absorption peak, etc., to shorten the required time, The effect of avoiding processing time and improving utilization

Inactive Publication Date: 2008-06-18
SHIN ETSU CHEM IND CO LTD
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, Patent Document 4 does not mention a method for determining the absorption peak around 630 nm.
In addition, there is no description of the behavior of the absorption peak around 630 nm when exposed to an environment containing deuterium gas.
In the following formula [Equation 1] expressing the loss α of an optical fiber, if it is considered that different Rayleigh scattering coefficients A can be obtained for each optical fiber, if the method of determining the absorption peak cannot be determined, then sometimes The size of the absorption peak around 630nm cannot be effectively judged due to the difference in the Rayleigh scattering coefficient A

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for treating optical fiber
  • Method for treating optical fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] An optical fiber with a small WP was produced, and 25 km of it was taken as an evaluation sample and rolled into a roll. In addition, a 2 km-long preliminary evaluation sample was cut from the same optical fiber for the purpose of testing the effect of the deuterium treatment described later. . Furthermore, a 2-kilometer optical fiber was cut out from the same optical fiber as a comparative sample and stored.

[0039] Before the deuterium treatment, the loss spectrum was measured for each of the evaluation sample and the preliminary evaluation sample. For a wavelength of 630 nm, a large absorption loss peak of 6 dB / km was measured in the 2 km long preliminary evaluation sample. On the other hand, in the evaluation sample with a length of 25 km, the loss per unit length could not be measured because the loss at 630 nm was too large. In contrast, the loss at a wavelength of 1714 nm was measured to be 0.750 dB / km for both the evaluation sample and the preliminary evaluat...

Embodiment 2

[0048] A 25-kilometer-long evaluation sample and a 2-km-long preliminary comparison sample were prepared. The deuterium treatment was performed under the same conditions as in Example 1, except that the amount of change in loss at a wavelength of 1714 nm at the end of the deuterium treatment was set to 0.03 dB / km. After approximately 4 days of exposure to the deuterium gas environment, the loss at 1714nm under monitoring reached 0.780dB / km, and the amount of change exceeded 0.03dB / km, so the deuterium treatment was terminated.

[0049] When the loss spectrum was measured for a 2-kilometer-long preliminary evaluation sample, the loss dropped significantly near a wavelength of 630 nm. In addition, when the evaluation test was performed on the preliminary evaluation sample by the method specified in IEC 60793-2, WP did not increase at all. Therefore, it was confirmed that when the deuterium treatment was performed before the change in loss at 1714 nm became 0.03 dB / km, an optica...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method for treating an optical fiber comprising a starting procedure for starting a treatment for exposing an optical fiber to atmosphere containing deuterium, and an ending procedure for monitoring the loss by the optical fiber of propagation light having a wavelength of 1714 nm or in the vicinity thereof and ending exposure when the variation in loss falls outside a predetermined range. The loss can be monitored by allowing propagation light having a wavelength of 1714 nm or in the vicinity thereof to enter from one end of the optical fiber while exposing the optical fiber to atmosphere containing deuterium, for example, and then monitoring the propagation light exiting from the other end of the optical fiber and measuring the loss. An optical fiber exhibiting excellent hydrogen resistant characteristics can thereby be produced surely and inexpensively.

Description

technical field [0001] The present invention relates to a method of processing optical fibers. More specifically, the present invention relates to a treatment method for improving the hydrogen resistance characteristics of an optical fiber used as a transmission medium of an optical signal. [0002] In addition, with regard to the designated countries recognized as incorporated by reference, the content described in the specification of the patent application shown below is incorporated into this application as a part of the present invention by referring to it. [0003] Patent application No. 2005-182468 Application date June 22, 2005 Background technique [0004] In the optical fiber, the peak (hereinafter referred to as "WP") of the absorption loss due to the OH group of the optical fiber exists in a frequency band with a wavelength of 1383 nm. Therefore, in optical communication using an optical fiber as a transmission medium, wavelengths in a frequency band around 140...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/00
CPCC03C25/607C03C13/047G02B6/02G02B6/00
Inventor 井上大
Owner SHIN ETSU CHEM IND CO LTD