Microbend losses in singlemode optical fibers: theoretical and experimental investigation

Loss Behavior of Single-mode Optical Fiber Microbend Sensors

“…Numerically predicted loss spectrum from simulations for a fiber subjected to 123 microbends at a period of 0.94 mm is shown in Figure 1 (solid line). These results show good agreement with experimental observation [4]. It should be noted that the optical power loss resulting from periodic microbending of the single-mode optical fiber exhibits maximum loss sensitivity at discrete wavelengths of which there are three within the spectral region from 1150 nm to 1450 nm.…”

“…Alternatively, the use of the transparent boundary condition can also be responsible for this behavior [8]. This effect may be investigated experimentally by taking more accurate measurements with smaller length intervals than those used in the previous study [4]. Different experimental and simulated attenuation levels can be attributed to the differences of the coating material between the actual and modelled fiber.…”

“…Although the experimental results show that the spectral losses in such sensors occur as a series of distinct maxima and minima [3], an accurate modelling technique is still not available. The mode coupling theory can predict the center wavelengths of the loss maxima, but it does not provide information regarding the spectral loss variation [4]. In a separate study, the beam propagation method (BPM) has been used to model the loss behavior of a multimode microbend sensor [5].…”

Single-Mode Optical Fiber Microbend Loss Modeling Using the Finite Difference Beam Propagation Method

“…A plot of the spectral position of peak 2 as a function of the deformation period produced by the FD-BPM simulations, as well w x as the experimental and theoretical results taken from Ref. 9 , is displayed in Fig. 6.…”

Fabrication and analysis of microbend fiber sensor using bending-sensitive fiber

“…[1][2][3] As a result, various microbend fiber sensors ͑MFSs͒ have been proposed using either a local microbend 4,5 or mechanical periodic axial microdeformation. 6,7 The MFSs that only use a local microbend have a limited sensing range, and the microbend loss increases suddenly at a critical microbend when varying the microbending given to the single-mode fiber ͑SMF͒. Meanwhile, the MFSs with a mechanical periodic axial deformation have an extended sensing range, and the microbend loss changes gradually, according to the microbend applied to the MFS.…”