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Multi-mode optical fiber measurement method

A multi-mode optical fiber and measurement method technology, which is applied in the direction of optical instrument testing, machine/structural component testing, optical fiber/optical waveguide equipment testing, etc., can solve the problems of inaccurate DMD measurement, optical fiber refractive index and length change, etc. Achieve the effect of shortening the measurement time and reducing the influence of temperature changes

Inactive Publication Date: 2007-02-07
THE FUJIKURA CABLE WORKS LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0013] As a result, the following problem was found: due to the temperature change of the fiber during DMD measurement, the refractive index and length of the fiber changed, and DMD measurement could not be performed accurately.

Method used

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  • Multi-mode optical fiber measurement method
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  • Multi-mode optical fiber measurement method

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Embodiment Construction

[0035] The measuring method of the multimode optical fiber of the present invention is characterized in that, in the DMD measurement of multimode optical fiber, the absolute value of the product of the measurement time and the temperature change rate of the measured optical fiber during measurement is less than or equal to 0.4°C, preferably less than or The DMD measurement was performed at a temperature equal to 0.3°C.

[0036] The reason why the temperature change affects the DMD measurement is that the optical fiber to be measured is affected by the temperature change, and the refractive index and length of the optical fiber change. That is, the reason is that the transit time in the optical fiber is different before and after the temperature change due to the temperature change. For DMD measurement using pulses to measure in the time domain, this shift is directly reflected in the measurement, and changes due to modal dispersion measured by DMD measurement cannot be discern...

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Abstract

The invention provides a precise measurement method, which is used for improving the DMD measurement precision of multimode optical fiber, and accurately measuring and evaluating the characteristics of multimode optical fiber. It is characterized in that, in the DMD measurement of the multimode optical fiber, the temperature change within the measurement time is monitored, and the DMD measurement is performed in an environment in which the amount of temperature change is controlled.

Description

technical field [0001] The present invention relates to methods for accurately determining the characteristics of multimode optical fibers. As an evaluation method of broadband multimode fiber, there is DMD (Differential mode delay, differential mode delay) measurement. By using the present invention to measure DMD, the influence caused by changes in the measurement environment can be reduced, so that accurate measurement can be performed. [0002] This application claims priority to JP Japanese Patent Application No. 2004-18512 for which it applied on January 27, 2004, and uses the content here. Background technique [0003] In recent years, the DMD measurement method has been standardized as a method for evaluating broadband GI optical fibers. By performing this measurement, it is possible to ensure the transmission of 300 m of broadband GI fiber at 10 Gbps stipulated in the IEC standard. [0004] Therefore, it is very important to perform high-precision DMD measurement ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02G01M11/00
CPCG01M99/002G01M11/30G01K11/32G01N2201/08G06F17/10
Inventor 竹永胜宏官宁松尾昌一郎姬野邦治原田光一
Owner THE FUJIKURA CABLE WORKS LTD