Abstract
Market forecasts and trends for the usage of fiber optical sensors confirm that demand for them will continue to increase in the near future. This article focuses on the research of fiber Bragg grating (FBG) sensor network, their applications in IoT and structural health monitoring (SHM), and especially their coexistence with existing fiber optical communication system infrastructure. Firstly, the spectrum of available commercial optical FBG temperature sensor was experimentally measured and amplitude-frequency response data was acquired to further develop the simulation model in the environment of RSoft OptSim software. The simulation model included optical sensor network, which is combined with 8-channel intensity-modulated wavelength division multiplexed (WDM) fiber optical data transmission system, where one shared 20 km long ITU-TG.652 single-mode optical fiber was used for transmission of both sensor and data signals. Secondly, research on a minimal allowable channel spacing between sensors’ channels was investigated by using MathWorks MATLAB software, and a new effective and more precise determination algorithm of the exact center of the sensor signal’s peak was proposed. Finally, we experimentally show successfully operating coexistence concept of the spectrum-sliced fiber optical transmission system with embedded scalable FBG sensor network over one shared optical fiber, where the whole system is feed by only one broadband light source.
Highlights
As it is observed in [1], fiber optical sensors are commonly used to measure a wide range of physical parameters, for example, temperature, strain, vibration, mechanical deformation, and pressure
In series on one optical fiber and they are located in different distances between each other, a different amount of attenuation on each reflected sensor peak can be observed
Market trends show that industry is in constant demand for fiber optical sensors in a wide variety of applications
Summary
As it is observed in [1], fiber optical sensors are commonly used to measure a wide range of physical parameters, for example, temperature, strain, vibration, mechanical deformation, and pressure. Considering a wide variety of reports that are based on a fiber optical market research [9], the newest statistics predict average annual growth of the sensor market in the range between 4.41% and 10.5% These numbers are acquired by combing a different kind of optical sensor types such as [10] point, distributed, quasidistributed, intensity, phase, polarization, frequency, physical, chemical biomedical ones, and different categories that are based on sensing location, operating principle, and applications. Changes in measured central frequency or wavelength of the sensor’s reflected signal are representing the variation of physical parameters such as temperature and strain Another key element, which is as important as the first one, is ensuring resource-effective architectures of data transmission and sensing systems, maximizing their compatibility. To the best of our knowledge, such experiments for the implementation of unified light source have not been conducted yet
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