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Download Now Download Download to read offline. Presentation about Fiber Optics Jan. Technology Business. Abidullah Zarghoon Follow. Cyber Security Specialist. Fiber optic cables. Optical fibre cable. Twisted pair cable. What is Optical fiber? The bend direction is determined on the controlled object, with sufficient accuracy for practical the base of the ratio of amplitudes of radiation of separate purposes. In Section 1, Controlled fiber Bragg gratings are used for measuring the we consider the structural diagram and operation princi- frequency components of the optical signals coming to the ples of the sensor.
Such a device can be used for precise photodetectors. Spectral ranges of the signals for each core are different.
When the fiber is bent, the op- tical power on different wavelengths redistributes over all cores. That results in variation of optical wavelength, at which the FBG reflection is maximal Bragg wavelength. By averaging the signals coming from the sensing element on different wavelengths, it is possible to determine the bend value and direction with high accuracy.
Calculating the Mode Fields and Optimizing the Sensor Design We use the algorithm based on the Method of Lines [14], [15], [18]—[21] modified for the structure under inves- tigation, for calculation of the mode field distribution and dispersion parameters of multicore microstructure fibers.
The results of calculations are shown in Figs. It follows from the figures that bending the fiber causes a redistribution of the mode power between fiber cores. The ratio of optical power transmitting in two cores located along the bend direction defines the bend value, while the relative shares of optical power in each of the three cores depend on bend direction. Thus by measuring the ratio of optical radiation intensity in three fiber cores, it is possible to determine both direction and value of the fiber bend.
For instance, in Fig. Maximal values of mode field amplitudes in fiber cores tribution caused by the bend occurs mainly between these located on bend axes versus bend radius for different values of core cores. Figure 3 shows the maximal values of mode field ampli- tudes in fiber cores no.
Numbers of cores are holes, curves 3 and 4 show the same in cores of the fiber indicated in Fig. Curves 1 and 2 rep- separation in five holes. Curves 7 and 8 Fig. The comparison of the dependencies of bend radiuses and cm, respectively. The sharp mode amplitudes on bend radius for different values of rise of power concentration in one core occurs for R equal hole-to-hole separation is presented in Fig.
Curves to 1 and 15 cm. Figure 4 shows the ratio of the mode field one core to another with the fiber bend can be achieved in amplitudes in right and left accordingly to the bend cores that way. The sensor accuracy is higher than the one of conventional distributed sensors, due to measurement at several wave- lengths and following average of the registered signal.
This is achieved by using a microstructured fiber as the sensi- tive element which has a wide spectral range of single mode operation. The use of three-core fiber makes it possible to define the direction of deformation. The optimization of the sensing element is carried out on the base of the numerical calculations of the mode param- eters, and field distribution over the fiber cores, depending on fiber structure and bend value.
Such sensors possess wider measurement range of the bend value. The Fig. Dependence of relative mode field amplitudes in fiber cores located on bend axes on bend radius..
Therefore, it is practically useful to apply them for measuring the small bends and deflections As it follows from the figures, fibers with a larger ratio of the rigid building constructions, i. Sen- such fibers, the mode fields are stronger concentrated in sors based on such fibers en-sure high accuracy of the mea- separate cores, and any break of the steady state conditions surement of small bends and deflections of the constructive leads to substantial transmitting optical power from one parts.
It is necessary to notice that if the core separation or core to another. The modes of such structure correspond to be more stable to an external influence. When the core separa- tained by changing the wavelength of the used optical ra- tion is increased up to five holes, the same effect occurs diation.
The sharp rise of the mode Special attention has to be paid to regular laying the fiber concentration in one core that is unusable for measuring when installing the sensor on the surface of controlled ob- and associated large radiation losses occur if such fibers ject.
That is necessary in order to avoid the fiber twist that are bent with radiuses around 3 and 10 cm, respectively. Guliaev, S. Nikitov, V. Potapov, and Yu. Garmash et. Udd Ed. He is a member of and Scientists. New York: Wiley, Inaudi and A. Earthquake Engin. His fields of investigation China, Broeng, D. Mogilevtsev, S.
Barkou, and A. Broeng, T. Sondergaard, S. Barkou, P. Barbeito, and A. Institute for Command Engineers [8] P. Lightwave Technol. Roberts and T. A: Pure Appl. Zhang and C. Mafi and J. He holds a Ph. Rothwell et al. Express, vol. Actually he is a profes- [14] I. Fund Fundamental Res. Goncharenko and M. He authored over pp. Burnett, P. Blanchard, and A. He serves as a Honorary International Ad- Blanchard et al.
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