System and method for testing loss characteristic of optical fiber by substitution method

Abstract

The invention belongs to the technical field of teaching experimental instruments of a system and method for testing the loss characteristic of an optical fiber by a substitution method, and disclosesa system and method for measuring the loss characteristic of the optical fiber by the substitution method. The system is provided with a light source module, an optical fiber channel, an XOR logic optical fiber length measuring module, an optical power indication module and a dual-trace digital oscilloscope, wherein the light source module comprises light outlets with four wavelengths (630, 860,1310 and 1550 nm); the optical fiber length measuring module comprises a modulation signal source, a modulation signal electro-optical / photoelectric conversion and regeneration circuit, an XOR logic and double-slope analog-to-digital conversion circuit; and the optical power indication module comprises SPD photoelectric detectors used for 630, 860 nm wavelengths, and PIN photoelectric detectors used for 1310 and 1550 nm wavelengths. Compared with the prior art, the system and method for measuring the loss characteristic of the optical fiber by the substitution method has the advantages of simple equipment, convenience in operation and the like, and is very suitable for the teaching requirement of a large number of students participating in the experiment.

Description

technical field [0001] The invention belongs to the technical field of optical fiber loss characteristic experimental measurement system and method, and in particular relates to an experimental test system and method for measuring optical fiber loss characteristic by a substitution method. Background technique [0002] Light waves are lost during optical fiber transmission, and the loss is related to the wavelength of the light wave. The reason why optical fiber communication can become a reality is mainly due to the improvement of optical fiber manufacturing technology, which makes the optical fiber have very low transmission loss for light waves of several special wavelengths. These wavelengths are called the window wavelengths of the optical fiber, and they are: 860nm, 1310nm and 1550nm.... For light waves with wavelengths in the range of the visible light spectrum, the transmission loss of the optical fiber is very large, so it is not suitable for the carrier of optical...

AI Technical Summary

Problems solved by technology

This is suitable for the inspection department of a research unit or an optical fiber drawing factory. As a teaching instrument, it needs to face a large number of students, and it is impossible to complete the above-mentioned complicated processing process under the condition of limited teaching hours.

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