Device and method for rapidly measuring optical fiber link attenuation characteristics under different transmission wavelengths

Abstract

Provided is a device and method for rapidly measuring the optical fiber link attenuation characteristics under different transmission wavelengths. The device comprises a multi-wavelength pulse light source controller, a WDM combiner, an optical fiber circulator, a WDM wave splitter, a multi-path photoelectric conversion unit, and a trigger control and signal processing unit, the input end of the multi-wavelength pulse light source controller is connected with the trigger control and signal processing unit, and the output end is connected with the input end of the WDM combiner, the output end of the WDM combiner is connected with the first port of the optical fiber circulator, the second port of the optical fiber circulator is connected with the optical fiber to be tested through an opticalinterface, the third port of the optical fiber circulator is connected to the input end of the WDM wave splitter, the output end of the WDM wave splitter is connected with the input end of the multi-path photoelectric conversion unit, and the output end of the multi-path photoelectric conversion unit is connected to the trigger control and signal processing unit. The device is short in testing time, good in testing effect and efficient in measurement, so that the optical fiber link attenuation characteristics under different transmission wavelengths can be obtained at the same time by plugging and unplugging the optical fiber to be tested once.

Description

technical field [0001] The invention belongs to the field of testing and measuring optical fiber characteristic parameters, and in particular relates to a device and method for quickly measuring the attenuation characteristics of optical fiber links under different transmission wavelengths. Background technique [0002] Optical fiber attenuation refers to the phenomenon that the optical power gradually decreases as the transmission distance increases during the transmission of light in the optical fiber. There are many factors that lead to fiber attenuation, mainly including inherent loss (scattering loss, absorption loss and loss caused by imperfect fiber structure), additional loss (microbending loss, bending loss and splicing loss). Optical fiber attenuation characteristics are one of the important indicators to measure the performance of optical fibers. In the production of optical fibers, it is necessary to measure the attenuation characteristics of optical fibers at di...

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Problems solved by technology

Among them, the truncation method such as figure 1 As shown, use a stable light source to input stable optical power into the optical fiber to be tested, first measure the output power P1 of the entire optical fiber to be tested at the end, cut off the optical fiber at the shortest distance (1m-2m) from the light source end, and then measure the remaining small section again The output power P2 of the optical fiber, ignoring the attenuation of the remaining optical fiber, the measured power can be regarded as the output power of the light source, and finally according to the difference between the output power of the light source and the output power of the entire optical fiber to be tested, the attenuation of the entire optical fiber to be tested can be obtained P=P2- P1, this method requires repeated plugging and unplugging, the coupling of the fiber connector is very easy to introduce measurement errors, and the attenuation distribution of the fiber cannot be observed, so this method is generally not used in the production process of the fiber; the backscatter measurement method such as figure 2 As shown, the optical time domain reflectometer is mainly used to couple the optical fiber to be tested to the optical time domain reflectometer of different wavelengths in stages, or to switch to the optical time domain reflectometer of different wavelengths by using a coupling device such as an optical switch, so as to obtain different transmission values. Optical fiber attenuation characteristics at different wavelengths, this method does not need to damage the optical fiber, but the test environment is complex during the multi-wavelength test process, there are many operating steps, time-consuming and labor-intensive, and it is easy to introduce operational measurement errors

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