A low-cost transceiver system suitable for otdr and its implementation method

Abstract

The invention discloses a low-cost transceiver system suitable for OTDR and its implementation method. The system includes a control unit, an optical transmission unit, an optical coupling unit, an optical reception unit and a temperature detection unit. The control unit is connected with the optical transmission unit and the optical reception unit respectively. It is connected to the temperature detection unit, and the optical sending unit, optical coupling unit and optical receiving unit are connected in sequence; the control unit has a built-in bias voltage temperature compensation module, which is used to bias the APD of the optical receiving unit according to the temperature calibration data table and current temperature data. Set the voltage for correction; the attenuation coefficient temperature compensation module is used to correct the original OTDR curve received by the light receiving unit according to the temperature calibration data table and current temperature data calculation. The invention adds a bias voltage temperature compensation module, an attenuation coefficient temperature compensation module and a temperature detection unit on the basis of the traditional OTDR, and solves the problem of temperature drift of low-cost devices used on the premise of reducing the overall cost of the system.

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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