Low-cost transmitting and receiving system suitable for OTDR and implementation method

Abstract

The invention discloses a low-cost transmit-receive system suitable for an OTDR (Optical Time Domain Reflectometer) and an implementation method, the system comprises a control unit, an optical transmitting unit, an optical coupling unit, an optical receiving unit and a temperature detection unit, and the control unit is connected with the optical transmitting unit, the optical receiving unit and the temperature detection unit. The optical transmitting unit, the optical coupling unit and the optical receiving unit are connected in sequence; the control unit is internally provided with a bias voltage temperature compensation module which is used for correcting APD bias voltage of the light receiving unit according to a temperature calibration data table and current temperature data; and the attenuation coefficient temperature compensation module is used for correcting the original OTDR curve received by the optical receiving unit according to the temperature calibration data table and the current temperature data calculation. According to the OTDR, the bias voltage temperature compensation module, the attenuation coefficient temperature compensation module and the temperature detection unit are added on the basis of a traditional OTDR, and the problem of temperature drift of adopted low-cost devices is solved on the premise that the overall cost of a system is reduced.

Description

technical field [0001] The invention relates to the technical field of optical fiber detection, in particular to an optical signal sending and receiving device used in optical time-domain reflectometer (OTDR) equipment, specifically a low-cost transceiver system and implementation method suitable for OTDR. Background technique [0002] OTDR is based on the principle of Rayleigh scattering and Fresnel reflection generated by light transmission in optical fiber. The OTDR test is to send an optical pulse with a certain wavelength, pulse width, power and frequency into the optical fiber. When the optical pulse propagates along the optical fiber, it will be damaged due to the nature of the optical fiber itself, joint coupling, bending, breakage, damage or other similar events. Scattering and reflection are generated, and part of the scattering and reflection will return to the OTDR, and the returned optical signal is measured by the detector of the OTDR. It can be used to measur...

AI Technical Summary

Problems solved by technology

In order to ensure the performance of OTDR, most of the APDs with cooling butterfly package are used at present. This kind of APD can work at the preset working temperature, the corresponding bias voltage is constant, and the gain is constant, so that the sampling curve has good temperature performance. The disadvantage is the butterfly package And the corresponding temperature control circuit occupies a large layout space, and the driving power consumption is large

On the other hand, for APD devices in coaxial packaging without refrigeration, it has the advantages of low cost, low power consumption and small layout space, but there is a problem of temperature drift

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