Wavelength-encoding optical time domain reflection test device and measurement method thereof

Abstract

The invention discloses a wavelength-encoding optical time domain reflection test device and a measurement method thereof. The device comprises an optical wavelength encoding generator, an optical fiber splitting device, a polarization controller, an optical fiber coupler, a photoelectric detector and a beat frequency signal detection device; wherein an encoding optical pulse signal generated from the optical wavelength encoding generator is input from a first port of the optical fiber splitting device and divided into a detection light signal and a reference light signal which are respectively output from a second port and a third port of the optical fiber splitting device; the detection light source enters into an optical fiber link to be tested, and a reflected light signal generated after meeting breakpoints or damages of the optical fiber link to be tested returns to the optical fiber splitting device from the second port and is output from a fourth port; the reflected light signal passes through the polarization controller, then passes through the optical fiber coupler together with the reference light signal and enters into the photoelectric detector to carry out frequency beating, and a beat-frequency low-frequency signal enters into the beat-frequency signal detection device and is then observed and recorded. The invention solves the problems that the OTDR resolution ratio and the dynamic range of the traditional device can not be simultaneously improved.

Description

Technical field

[0001] The invention relates to the technical field of optical fiber link testing, in particular to a wavelength-coded optical time domain reflection testing device and a measurement method thereof. Background technique

[0002] Optical Time-Domain Reflectometer (OTDR) is abbreviated as OTDR. It is a test instrument based on backscattered or reflected light signals. It is a typical optical time-domain reflectometer. OTDR generally includes light source, optical fiber coupler or optical circulator, optical detector, signal processing and display, etc. Traditional OTDR uses pulsed laser as the light source. The pulsed laser emits light pulses to the optical fiber link to be tested. The power and transmission time obtain parameters such as loss characteristics and reflection distance. This instrument can conveniently perform non-destructive detection of optical fiber links or systems, and can continuously display the relative position changes and fault points of the...

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