Method for synchronously measuring attenuation coefficient and cut-off wavelength of optical fiber

Abstract

The invention provides a method for synchronously measuring the attenuation coefficient and cut-off wavelength of an optical fiber. A bending reference method or a multi-mode reference method is adopted for measuring the attenuation coefficient and cut-off wavelength of the optical fiber. The bending reference method includes the following steps of measuring the fiber output optical power of the long optical fiber to be tested, cutting out a short optical fiber, measuring the fiber output optical power of the short optical fiber in the status of a small circle and a large circle, releasing the small circle, measuring the fiber output optical power of the short optical fiber only in the status of the large circle, and working out the cut-off wavelength and the attenuation coefficient. The multi-mode reference method includes the following steps of measuring the fiber output optical power of the long optical fiber to be tested, cutting out a short optical fiber, measuring the fiber output optical power of the short optical fiber, calling the existing fiber output optical power of the output end of a multi-mode optical fiber in a system, fitting the transmission power spectrum of the short optical fiber in the status of a large circle, and working out the cut-off wavelength and the attenuation coefficient. The attenuation coefficient and cut-off wavelength of the optical fiber can be simultaneously measured through the bending reference method or the multi-mode reference method, and therefore the number of measuring steps is reduced, measuring time is shortened, and measuring efficiency is effectively improved.

Description

technical field [0001] The invention relates to a method for testing optical fiber parameters, in particular to a method for synchronously testing fiber attenuation coefficient and cut-off wavelength. Background technique [0002] Optical fiber attenuation coefficient (also known as attenuation coefficient) refers to the attenuation value of optical signal power per kilometer of optical fiber. It is one of the most important characteristic parameters of multimode optical fiber and single-mode optical fiber. The relay distance of multimode fiber optic communication. In addition, the cut-off wavelength is defined as: a single-mode fiber usually has a certain wavelength. When the wavelength of the transmitted light exceeds this wavelength, the fiber can only transmit light in one mode (fundamental mode), and below this wavelength, the fiber can Propagates light in multiple modes (including higher order modes). Therefore, in the actual application of optical fiber, it is often...

AI Technical Summary

Problems solved by technology

[0003] At present, the test of fiber attenuation coefficient and cut-off wavelength is carried out separately. At the same time, there are two test methods for fiber cut-off wavelength: bending reference method and multimode reference method. Therefore, when testing fiber attenuation coefficient and cut-off wavelength, There are many test steps, the process is complicated, and the test time is too long, resulting in low test efficiency

Images