Loss Behavior of Single-mode Optical Fiber Microbend Sensors

Abstract

Periodic microbending has been studied to develop an insight into the loss behavior of single-mode microbend sensors by using the finite-difference beam propagation method. Loss sensitivity variations with wavelength are examined, as well as the optical loss dependence on the number of microbends and the modal field perturbations caused by the microbending.

Vibration Detection Using Optical Fiber Sensors

“…Both multimode and single-mode fibers have been used for the constructions of these sensors [19]. While multimode microbend sensors show the maximum sensitivity when the bending frequency is equal to the difference in propagation constants for the propagating and radiation modes [20], in single-mode optical fiber microbend sensors, the maximum sensitivity is achieved when the spatial bend frequency equals the difference between the propagation constants of the fundamental mode and a discrete cladding mode [21].…”

Research Progress of Fiber Grating Vibration Sensor

“…JW Berthold [11] has analyzed the micro-bending properties of gradient multimode fiber and stepped multimode fiber in 1995, And used to measure vibration, stress and temperature and other environmental parameters. In 2001, G. Murtaza et al Analyzed the microbending properties of ordinary single-mode fiber analyzed by finite difference beam propagation method, and analyzed the loss characteristics of micro-bend fiber optic sensor [12]. FIGURE 6.…”

“…Micro-bend fiber vibration sensor is a kind of early study of the vibration sensor [11][12], its working principle shown in Figure 6. Wherein the micro-bend deformer consists of two corrugated plates having a specific period, the period of which is determined by the propagation constant between the fiber modes.…”

“…There are many types of light intensity modulation type vibration sensors, which can be divided into external modulation type [3][4][5][6][7][8][9][10] (modulation area outside fiber) and internal modulation type [11][12] (modulation area Within the fiber). External modulation type can be divided into reflective and transmission type; internal modulation type can be divided into micro-bend modulation and absorption modulation.…”

“…In recent years, fiber optic sensor technology based on fiber optic sensor with its anti-electromagnetic interference, small size, light weight, wide dynamic range, high precision, can work in harsh environments have been the rapid development of the advantages [2]. In the past few decades, fiber optic vibration sensor has been a lot of research and reports, according to the parameters of light modulation can be divided into four categories: light intensity modulation [3][4][5][6][7][8][9][10][11][12], optical phase modulation [13][14][15][16][17][18][19][20][21][22][23][24][25] And optical wavelength modulation [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] vibration sensor, this paper mainly discusses the status of these three sensors.…”