Bidirectional optical amplification device based on wavelength division multiplexing transmission

Abstract

The invention discloses a bidirectional optical amplification device based on wavelength division multiplexing transmission. The bidirectional optical amplification device comprises a bidirectional wavelength division multiplexing unit and a unidirectional optical amplifier; the bidirectional wavelength division multiplexing unit is used for carrying out wavelength division multiplexing on opticalsignals from the port A and the port B on an optical fiber and sending the optical signals to the unidirectional optical amplifier for amplification, and then separating the amplified optical signals, so that the signals input by the port A are amplified by the one-way optical amplifier and then output to the port B, and the signals input by the port B are amplified by the one-way optical amplifier and then output to the port A. According to the invention, optical amplification is carried out on the bidirectional time / frequency signal based on the wavelength division multiplexing transmissiontechnology, the influence of multiple amplification of Rayleigh scattering and other noises on the performance of the optical fiber time / frequency transmission signal can be effectively avoided, andthe amplification of the unidirectional communication service transmission signal in the optical fiber link is not influenced. The bidirectional optical amplification device can be used for an opticalfiber time, optical fiber frequency and optical fiber time frequency combined transmission system, and can also be used for a transmission system combined with one-way communication transmission service.

Description

technical field [0001] The invention relates to the field of optical fiber time-frequency transmission, in particular to a bidirectional optical amplification device based on wavelength division multiplexing transmission. Background technique [0002] High-precision time-frequency references play a supporting role in the fields of satellite navigation, precision measurement, and deep space exploration. At present, mature and widely used satellite-based time-frequency transfer technologies, such as GPS Common View (CV), satellite two-way time-frequency Comparison method (TWSTFT), etc., due to the interference of environmental factors on the free space transmission link, the accuracy of time transmission can only reach the ns level, and the stability of frequency transmission can only reach 10 -15 / d; With the invention and use of clock sources with higher stability and uncertainty, such as optical atomic fountain clocks, space-based time-frequency transfer technology can no l...

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Problems solved by technology

[0004] AGH University of Technology in Poland proposed a single-fiber bidirectional optical amplifier for optical fiber time-frequency transmission [S. , P. Krehlik, B. , and M.Lipinski,"Frequency Transfer in Electronically Stabilized Fiber Optic Link Exploiting Bidirectional Optical Amplifiers,"IEEE Transactions on Instrumentation and Measurement 61,2573(2012)], by replacing the isolator at both ends of the unidirectional EDFA to limit the bidirectional transmission of optical signals Single-fiber bidirectional optical amplification is realized by using a filter. Although the symmetry of the bidirectional transmission delay of the link is guaranteed, the noise such as Rayleigh scattering will be amplified multiple times, which will seriously deteriorate the receiving signal-to-noise ratio and limit the time-frequency transfer performance.

Japan's National Metrology Institute NMIJ proposed a bidirectional optical amplification scheme for wavelength division multiplexing (WDM) optical fiber time-frequency transmission system [M.Amemiya, M.Imae, Y.Fujii, T.Suzuyama, F.L.Hong, and M.Takamoto , "Precise Frequency Comparison System Using Bidirectional Optical Amplifiers," IEEE Transactions on Instrumentation and Measurement 59,631(2010)], although multiple amplifications of noise such as Rayleigh scattering are suppressed by wavelength division multiplexers and isolators, the system cost increases with The use of wavelength increases, and it is not compatible with the unidirectional optical amplifier in the existing optical communication network

The Czech education and research network CESNET uses distributed Raman amplifiers [V.Smotlacha and J.Vojtěch, "Time and frequency transfer using amplified optical links," in European Frequency and Time Forum, (2015), 325] to analyze the time and frequency of two-way transmission The signal is optically amplified. Although a single fiber can guarantee the symmetry of the link transmission delay, noise such as Rayleigh scattering will also be amplified multiple times. At the same time, there are problems such as high pump power, low efficiency, and sensitivity to optical polarization.

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