Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF0 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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 and structure for precisely measuring optical fiber length

Examples

Experimental program
Comparison scheme
Effect test

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.

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

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

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): G01B11/02G02F1/35
Inventor 张祖兴叶志清桑明煌聂义友
Owner JIANGXI NORMAL UNIV
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com