Bidirectional wavelength division multiplexing optical amplifier device

Abstract

A bidirectional wavelength division multiplexing optical amplification device for optical fiber time-frequency transmission, which sequentially includes a first division / multiplexer, a multiplexer, a one-way optical amplifier, a wavelength division and a second division / multiplexer along the forward direction device. The present invention separates the time / frequency transmission channel from the optical fiber wavelength channel by using a splitter / multiplexer, so that the forward and backward transmission channels on the time / frequency transmission channel and other unidirectional service transmission channels enter the single channel containing the optical isolator. The optical amplifier realizes the two-way amplification of the same fiber and different waves of the optical signal carrying the time / frequency in the bidirectional wavelength division multiplexing time-frequency transmission link, effectively avoiding the multiple amplification of noise such as Rayleigh scattering that affects the time-frequency transmission performance of the optical fiber influences. At the same time, it does not affect the amplification of other unidirectional service transmission channels in the optical fiber, and realizes compatibility with the unidirectional optical amplification in the optical fiber communication network.

Description

technical field [0001] The invention relates to optical fiber time-frequency transmission, in particular to a bidirectional wavelength division multiplexing optical amplification device for optical fiber time-frequency transmission. Background technique [0002] High-precision time-frequency references play an important supporting role in the fields of satellite navigation, precision surveying, geological surveying and mapping, telemedicine and deep space exploration. At present, satellite-based time-frequency transfer technologies, such as GPS Common View (CV) and Satellite Two-way Time-Frequency Comparison (TWSTFT), due to the interference of environmental factors on free space transmission links, the accuracy of time transfer can only reach ns order of magnitude, the stability of frequency transmission can only reach 10 -15 / day. With the continuous development of new technologies, clock sources with higher stability and uncertainty such as optical clocks have been inve...

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Problems solved by technology

This solution needs to insert an isolator for each wavelength channel, which increases the cost of the system, and the amplifier needs to be customized, which is not compatible with the unidirectional optical amplifier in the existing communication network

The Czech education and research network CESNET and others use distributed Raman amplifiers [5, V.Smotlacha and J.Vojtěch, "Time and frequency transfer using amplified optical links," in European Frequency and Time Forum, (2015), 325.] for two-way The transmitted time-frequency signal is optically amplified. Although a single fiber can guarantee the bidirectional symmetry of the link transmission delay, the noise such as Rayleigh scattering will also be amplified multiple times. Polarization sensitivity and other issues

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