ANALISIS PERHITUNGAN KERUGIAN DAYA PADA LENDUTAN SERAT OPTIK DENGAN SIMULASI MATLAB

Abstract

: Bending is one of the causes of signal transmission loss through the electromagnetic wave medium in the optical fiber. There are two types of bending lossess: microbending and macrobending. Both of them occur when the surface of the optical fiber cable experiences external pressure which causes deformation in the core of the optical fiber. Bending causes the loss of the optical transmission power affected by decreased light intensity, therefore the output ratio becomes degraded to the input one. This kind of condition assumed can be utilized for designing the optical fiber-based sensor by observing the response of the optical fiber against the external disturbances or stimulation. One example is the mechanical force that causes the deformation to the optical fiber. Based on the simulation result through the Matlab programming for macrobending loss, it was obtained that the highest power loss at 1.817 × 10 -4 dB/mm on the 10 mm bending radius for the 1650 nm wavelength, and the lowest at 2.683 × 10 -8 dB/mm on the 20 mm bending radius for the 1250 nm wavelength. Meanwhile for microbending loss, it obtained the largest change of transmission coefficient at 59.070% for 100 mm spacer length with applied mechanical force as large as 10 6 dynes or 10 N, and the smallest change at 0.591% for 10 mm spacer length with applied mechanical force as large as 10 5 dynes or 1 N. These significant changes of the measured values show that the optical fiber, by simulation, is pretty responsive against the external stimulations, either on the macroscopic scale or the microscopic scale. So that based on its responsiveness, we can assume that optical fiber is most likely possible to be utilized in various modern fiber optic sensor for many applied technologies.