Layering Employment for Modification in Tensile Strain Response of Step Index SMF

In this article, with the aim of a new strain sensing element introduction, the tensile strain behavior of the step index single mode optical fiber (SMF) is taken into account. The selection of mode field diameter (MFD) as the indirect parameter for strain sensing task yields the strain sensitivity of 10.82pmµɛ-1. Furthermore, the effect of adding layers of the depressed and raised type to the cladding region of step index structure is considered which is observed as a growth in the fiber sensitivity to applied tensile strain. The simulation results admit the higher efficiency in employement of depressed inner clad which boosts the sensor sensitivity as a result of remarkable alteration in the electrical field distribution. The design procedure of the optical structure is based on evolutionary genetic algorithm (GA). Moreover, the calculated negligible temperature sensitivity for all the three proposed structures removes the temperature compensation complexity

کلیدواژه ها:

Fiber optic sensor ، Tensile strain ، Single mode ، MFD ، GA