Method and structure for precisely measuring optical fiber length

A technology of optical fiber length and measurement method, which is applied in the fields of precision measuring instruments and optical fiber communication

Inactive Publication Date: 2009-07-08
JIANGXI NORMAL UNIV
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  • Abstract
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Problems solved by technology

After the fiber to be tested is connected to the laser cavity, it is easy to adjust the polarization controller to make the laser generate a mode-locked pulse sequence

Method used

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  • Method and structure for precisely measuring optical fiber length

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Embodiment Construction

[0012] A section of known length of 12.65km single-mode optical fiber is connected into the passive mode-locked laser ring cavity from the optical fiber access port (7,8). The length of the erbium-doped optical fiber in the known equipment is 12m, and the length of other connecting optical fibers is 15m. Therefore, the cavity length of the entire laser is 12.677km. Adjust the polarization controller and pump power to stabilize the passive mode-locked laser pulse at the fundamental frequency. At this time, the mode-locked pulse period T=62.07878μs is obtained by taking the average value of multiple samples on the oscilloscope , stable at the fourth place after the decimal point, according to the formula L=qcT / n, if we take c=299792458m / s, n=1.4680, q=1, the measured fiber length is L≈12.6776km, which is different from the actual length of the fiber match.

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Abstract

The invention discloses a method and a structure for precisely measuring the length of optical fibers, and belongs to the field of precision measuring instruments. The method is to measure the length of the optical fibers by utilizing the relation that the period of stable mode-locking pulse sequences generated by a passive mode-locking optical fiber laser is directly proportional to the length of a cavity of the laser. The structure consists of an erbium-doped optical fiber, a 980/1,550 nm wavelength division multiplexer, 980 nm pumping laser, a polarization dependent isolator, two polarization controllers and a 10 dB coupler. The optical fiber to be measured is connected with the laser through an optical fiber access port; the polarization controllers are adjusted to acquire stable fundamental-frequency mode-locking pulses; and the length of the optical fiber to be measured can be directly calculated by reading out the pulse period on an oscilloscope. The measurement precision of the method and the structure can reach centimeter order, and the method and the structure can be used for measuring the length of hundreds of kilometers of optical fibers.

Description

[0001] technology neighborhood [0002] The invention relates to the fields of precision measuring instruments and optical fiber communication, and in particular provides a method and structure for precisely measuring the length of optical fiber. Background technique [0003] Optical fiber has the advantages of high anti-interference ability, high transmission rate and extremely low transmission error rate in the process of signal transmission. Therefore, optical fiber communication has become the main transmission mode of various communication networks and plays a vital role in the construction of information highway. important role. Optical fibers laid on land and in the ocean connect many countries and regions and are closely related to our daily life. Optical fiber length measurement is involved in various aspects such as optical fiber testing, optical cable laying, and fault inspection. In various optical fiber experiments, the problem of selecting the appropriate optic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02G02F1/35
Inventor 张祖兴叶志清桑明煌聂义友
Owner JIANGXI NORMAL UNIV
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