This paper proposes a Brillouin and Rayleigh fusion system for multi-parameter monitoring of power OPGW cables. Temperature, strain, and vibration measurements are important indicators for safe cable operation of OPGW cables. Temperature monitoring helps detect ice-coating, mountain fire, and lightning. Strain measures cable stress, fiber core safety, ice-coating, and fatigue damage caused by wind-induced vibrations. Vibration monitoring is useful for ice covering and wind vibration. The proposed system overcomes limitations such as nonlinear effects and limited sensing distance. By using a fixed delay of 500ns, mutual position calibration of temperature/strain and vibration measurements is achieved. The system uses a two-wavelength distributed optical fiber fusion scheme with dual light sources, ensuring no interference or degradation due to index conflicts.
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.
With the rapid development of the electric telecommunication network, the demand for fiber channels is growing day by day. Increasing the number of optical fiber cores has become an inevitable choice for electric telecommunication network construction. If the number of optical fiber cores is increased only by increasing the outer diameter of the optical unit, the structure, weight, mechanical and electrical properties of OPGW will be changed. Therefore, there are strict restrictions on the outer diameter of the OPGW design. It is a visible solution to use small diameter fiber without increasing the outer diameter of optical cell. In this paper, the feasibility and applicability of 200μm G.657.A1 optical fiber applied to the electric telecommunication network are studied. The cable performance of OPGW made by 200μm G.657.A1 optical fiber and the transmission performance of G.657.A1 optical fiber in 10G / 100G ultra-long-haul transmission systems are tested and analyzed, which provide beneficial support and suggestions for the selection of optical fiber and cable in engineering construction of electric telecommunication.
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