In this paper, we propose a high fidelity phase-sensitive optical time-domain reflectometer (Φ-OTDR) system based on compact and flexible multi-frequency probe pulse modulation. Single-frequency continuous light is multi-frequencymodulated by a broadband acousto-optic modulator (AOM) loaded with multiple microwave signals of different frequencies, finally, multiple Rayleigh backscattered (RBS) optical signals with different intensity distributions can be obtained by a single acquisition, and the most accurate signal is always selected for phase reconstruction to achievethehigh fidelity Φ-OTDR system, which has the advantages of compact structure, precise control of phase delay, flexible and controllable frequency components, and no sacrificing response bandwidth and spatial resolution, etc. In the experiment Φ-OTDR system, we simultaneously modulate the multi-frequency probe pulse light with a width of 100nsand three non-equidistant frequencies, and inject it into a 2km sensing fiber. The RBS light signal multiplexing results show that the probability of interference fading effect in the system is reduced from 17.541% to 1.123%. And the high-fidelity phase information of a 100Hz simulated vibration signal was extracted on a 3km sensing fiber, corresponding to a strain value of about 11.9nε.
In this paper, the properties of ultra-low loss and large effective area G.654.E fiber were studied, including the optical properties and cabling performance. Based on the tests of the transmission performances of different optical fibers in nonrelay ultra-long haul optical transmission system, practical suggestions for optical fiber selection of electric communication construction were proposed. G.654.E fiber was utilized in practical engineering, verifying the theoretical research and identifying optimal direction and methods. 467 km non-relay ultra-long haul optical transmission was realized, creating a new record in electric communication network.
The national strategy of “East Data West Computing” is in full swing, and the computing power network will become an important infrastructure. The development of computing power network has put forward higher requirements for backbone network and large data centers. To construct optical base of computing power network needs novel optical fiber technology. For backbone transmission networks, the practical application research results of operators and State Grid have fully proved the application value of G.654.E fiber, which also have provided theoretical and practical basis for the large-scale application of G.654.E fiber and the construction of the next generation backbone network.
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