Single-mode Optical Fiber: An Investigation for the Bending Loss at Wavelength 650 nm

In modern time, the optical fiber communication has revolutionized the data transmission process and contributed vitally to the development of qualitative and speedy telecommunication systems. The arteries of this system are optical fibers which carry information as light signals and as fast as speed of light. But these light signals suffer energy losses during their propagation through the optical fibers. For the effective functioning of an optical fiber communication, it is necessary to know and prevent the prevailing energy losses (especially external bending losses) of the optical fibers. In this paper, the external bending loss of optical power while propagating through a single-mode optical fiber has been investigated. Further, the effects of wrapping turns (1 to 6 turns) and bending diameters (2 cm ≤ D ≤ 12 cm) on the power loss of laser at a wavelength of 650 nm have been studied. Keywords: Single-mode optical fiber, Bending loss, Attenuation coefficient, Wrapping turns, Bending diameter. PACs: 42.81.-I, 78.67.Pt, 42.25.Bs.

Exploration of Long-Range Surface Plasmon Resonance on Multilayer Single Mode Optical Fiber With Function of MgF2

Multilayer models for single mode optical fiber based on Long Range Surface Plasmon Resonance (LRSPR) coated with silver (Ag) and gold (Au) with dielectric function of MgF2 are introduced. Properties for the models are theoretically and experimentally reported in this work. Firstly, the performances of different models are investigated using COMSOL simulation. Different combinations of magnesium fluoride (MgF2) and Ag/Au material embedded layers are applied to observed functionality of dielectric layers underneath the analyte. In theoretical analysis, MgF2-Ag and MgF2Ag-MgF2 layers conveys the best performance in sensing. The combination of plasmonic material Ag with MgF2 rather than Au shows higher sensitivity response. The experimental has been carried out with these configurations where exhibit the sensitivities of 1762.5 nm/RIU and 1250 nm/RIU at 1.371.38 and 1.33-1.34 RI range respectively for silver-based models. The outcomes indicate the proposed LRSPR based models with specific dielectric where here MgF2 found to be a strong match in sensing applications.

Automated Fiber-Optic System for Monitoring the Stability of the Pit Quarry Mass and Dumps

This article ls with the issues related to the development of a system for monitoring the deformation and displacement of the rock mass leading to the collapse of the quarry sides. Monitoring system uses point-to-point fiber-optic sensors. Fiber-optic sensors and control cables of the communication line are made based on the single mode optical fibers, which allows to measure with high accuracy the deformations and displacements of the rock mass at a distance of 30-50 km. To create fiber-optic pressure sensors, an optical fiber of the ITU-T G. 652.D standard is used. Laboratory sample is developed concerning the point fiber-optic sensor made based on the two-arm Mach-Zender interferometer using a single mode optical fiber for monitoring strain (displacements) with a change in the sensitivity and a reduced influence of temperature interference leading to zero drift. The article presents a mathematical apparatus for calculating the intensity of radiation of a light wave passing through an optical fiber with and without mechanical stress. A laboratory sample of single mode optical fibers based on the Mach-Zender interferometer showed a fairly high linearity and accuracy in the measurement and can be used to control the strain of the mass after appropriate refinement of its design. Mathematical expressions are also given for determining the intensity of the light wave when the distance between the fixing points of a single mode optical fiber changes depending on the change in the external temperature. A diagram for measuring strain using a point fiber-optic strain sensor is developed. Hardware and software package is developed, which can be used to perform a number of settings of measuring channels. The work is aimed at solving the production problems of the Kenzhem quarry of AK Altynalmas JSC.