Fibre core loss measuring method and system of heterogeneous optical fiber fusion welding point

Abstract

The invention relates to a fibre core loss measuring method and system of a heterogeneous optical fusion welding point. The loss measuring system mainly consists of two light sources and two optical power meters. The fibre core loss measuring method comprises the following steps of: respectively connecting the light source to one end of each of different types of optical fibres, respectively connecting the optical power meter to the other end of each of the different types of the optical fibres, and obtaining optical power values Ra and Rb when the two optical fibers are directly connected; keeping the connection between the optical fibre tips and the optical power meters unchanged and the output power of the light sources unchanged, respectively cutting off the two optical fibers from the middle parts and carrying out fusion welding in a crossed way, and reading numerical reading of the optical power meters again to obtain optical power values Ras and Rbs after crossed fusion welding; and obtaining the average loss: [(Ra+Rb)-(Ras+Rbs)] / 2 at the heterogeneous optical fiber fusion welding point through calculating according to the measured data. The fibre core loss measuring method is simple and effective, and has high precision and active roles and can be used for effectively measuring and estimating the fusion welding loss of different types of optical fibres.

Description

technical field [0001] The invention relates to a method for measuring fiber core loss at an optical fiber fusion splicing point (abbreviated as splicing loss), in particular to measuring the core loss at a splicing point of dissimilar optical fibers. Background technique [0002] We know that in various optical fiber systems such as optical sensors and fiber lasers, the fusion loss of optical fibers is an important factor affecting system performance. Accurate measurement of splice loss plays an important role in evaluating and improving the performance of fiber optic systems. At present, the detection of splicing loss can be carried out by optical time domain reflectometer (OTDR), which is judged by transmitting light pulses in optical fibers to observe the degree of reflected light. Since light not only reflects at the fusion joint, but also has scattering and absorption, there is a large difference between the loss of the fusion joint and the actual loss only by measuri...

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Problems solved by technology

[0004] The disadvantages of the above methods are that either the loss can only be measured at the mutual fusion points of the same optical fiber, or the measurement and estimation accuracy is not enough

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