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Multi-mode optical fiber measurement method

A technology of multimode optical fiber and measurement method, which is applied in optical instrument testing, machine/structural component testing, testing optical fiber/optical waveguide equipment, etc., can solve problems such as inability to accurately measure DMD, optical fiber refractive index and length variation, etc. Achieve the effect of shortening the measurement time and reducing the effect of temperature changes

Inactive Publication Date: 2009-09-23
FUJIKURA LTD
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  • Abstract
  • Description
  • Claims
  • 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

[0036] 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.

[0037] 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

There is provided an accurate measurement method for improving the DMD measurement accuracy of a multi-mode optical fiber, and accurately measuring and evaluating the characteristic of multi-mode optical fiber. In the DVD measurement of the multi-mode optical fiber, a temperature change in the measurement time is monitored and the DMD measurement is performed while controlling the temperature change amount.

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 filed 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 from the viewpo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/02G01M11/00
CPCG01M11/30G01M99/002G01K11/32G01N2201/08G06F17/10
Inventor 竹永胜宏官宁松尾昌一郎姬野邦治原田光一
Owner FUJIKURA LTD