Submarine optical cable simulation test device and method for coherent optical time domain reflectometer

Abstract

The invention discloses a long-distance submarine optical cable simulation test device and method for a coherent optical time domain reflectometer. The sensor comprises a 50km first sensing optical fiber, a 3 * 3 coupler, a first optical amplifier, a 2 * 2 coupler, a 50km second sensing optical fiber, a circulator, an optical on-off control unit, a 50km first transmission optical fiber, a second optical amplifier, an optical isolator and a 50km second transmission optical fiber which are sequentially arranged in the direction of an optical path and are connected through optical fibers. According to the simulation test device and method, long-distance test simulation can be achieved without delay lines, compared with the prior art, the simulation test device and method are smaller in size,lower in cost and convenient to operate, and the transmission process and the transmission state of the probe light in the long-distance submarine cable can be simulated more accurately and properly.

Description

technical field [0001] The invention relates to the technical field of submarine optical cable simulation testing, in particular to a long-distance submarine optical cable simulation testing device and method for a coherent optical time domain reflectometer. Background technique [0002] Submarine optical cable communication has the characteristics of stable and reliable communication quality, good confidentiality, good concealment, anti-destruction, anti-interference, long-distance, large capacity, etc. As a means of communication across the sea, it has advantages that cannot be replaced by any other means of communication. Submarine optical cables are usually used to connect two islands or countries for communication. Therefore, in order to obtain sufficient communication data space, submarine optical cables are usually composed of multi-core optical fibers and complex protective layers, so the cost is high and expensive. At the same time, since the submarine optical cable...

AI Technical Summary

Problems solved by technology

In the development process of the coherent optical time domain reflectometer, the test of the submarine cable is the main test environment of the coherent optical time domain reflectometer, and the cost and price of the submarine cable severely limit the development progress of the coherent optical time domain reflectometer, so it is necessary to propose a A simulation test method that can be used to simulate submarine optical cable testing

In traditional solutions, the simulation of optical fiber links is usually realized by means of optical switching and delay lines. However, due to the limited delay time and high cost of delay lines, it is not practical for long-distance submarine cable link simulation.

In the fiber link simulation scheme based on delay lines and optical switches, the delay line is usually used to delay the optical signal, thereby simulating the long-distance transmission of the optical signal, but the delay effect that a single optical delay line can usually play Limited, so multiple delay lines need to be connected in series to achieve the purpose of long-distance testing, which causes an increase in cost

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