Effect of Change Optical Fiber Turn Numbers on Rate of Laser Light Intensity Outside of the Single- Mode Optical Fiber

Abstract

In this research study has effect of change optical fiber turn numbers on rate of laser light intensity outside of the single -mode optical fiber. Used in this research optical fiber single- mode overall diameter (210µm) and diameter of core material (5µm) wrapped around the cylinder with different diameters (4.5 cm, 2.1 cm) and the number of rolls of different fiber optic. Use as well as a laser diode semiconductor working within the zone wavelength (630 nm) and light power (5mW), was calculated rate of light intensity of the spot laser through algorithms computing for each spot is taken the image with a digital camera linked to a computer. We found through the search results, the relationship between number of turn and rate of laser spot intensity outside of the single -mode optical fiber was inversed, rate of laser spot intensity increase, the number of turn decrease then decrease when the number of turn increase till reach to stability for different diameters of this fiber. Also , when increasing of diameter obtain the large coherent of the laser spot, therefore the diameter(4.5 cm) was the best than the diameter ( 2.1 cm) to obtain on the rate of high intensity of the laser spot in this diameter.