Optical power adaptive dense wavelength division multiplexing relay system

Abstract

The invention discloses an optical power adaptive dense wavelength division multiplexing relay system. The system comprises a first demultiplexer / multiplexer used for sending a first time frequency signal to a first SFP optical module; the first SFP optical module is used for sending a first signal obtained by re-modulation to the first optical fiber coupler; the first optical fiber coupler is used for generating a first sub-signal and a second sub-signal and then respectively sending the first sub-signal and the second sub-signal to a next-stage receiving device and the second SFP optical module for a user side to use; the second SFP optical module is used for re-modulating a second sub-signal passing through the user side and sending a second time frequency signal to the second optical fiber coupler; the second optical fiber coupler is used for adjusting the splitting ratio of the second time frequency signal and sending a third time frequency signal to the third SFP optical module; and the third SFP optical module is used for sending the third time frequency signal to the local end. Noise accumulation caused by the EDFA is avoided while signal transmission of the same fiber and different wave channels is completed.

Description

technical field [0001] The invention belongs to the technical field of optical fiber time-frequency transmission, and in particular relates to an optical power self-adaptive dense wavelength division multiplexing relay system. Background technique [0002] High-precision time-frequency references play an important supporting role in the fields of satellite navigation, precision measurement, and high-speed communications. Optical fiber transmission has the advantages of low loss, large capacity, and high reliability, so it has been widely used. [0003] For high-precision optical fiber time-frequency transmission, in order to maintain the symmetry of bidirectional link transmission and suppress the impact of changes in environmental factors, a single-fiber bidirectional transmission scheme is generally used at present. In related technologies, the downlink optical signals of two sites pass through the first dense wavelength division multiplexer, the first erbium-doped fiber a...

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Problems solved by technology

[0004] However, since the above-mentioned single-fiber bidirectional transmission system uses EDFA (Erbium-doped Optical Fiber Amplifier, Erbium-doped Fiber Amplifier) ​​for optical amplification, while the EDFA amplifies the optical power of the useful signal, it also amplifies the noise, thus causing noise Enlarge accumulation

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