Efficiency of Optical Fiber Cables Due to the Angle of Incidence

Topcuoğlu, Ulaş (2014) Efficiency of Optical Fiber Cables Due to the Angle of Incidence. Other thesis, TED ANKARA KOLEJİ.

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The scope of this experiment is based on figuring out the answer of the following question: “What is the effect of angle of incidence for the light passing from air to core on the efficiency of optical fiber cables?” The term “efficiency” is leaning on the difference between output intensities of laser. A helium-neon continuous laser is used throughout the investigation. This type of laser has relatively low energy compared to other lasers such as Nd:YAG lasers with 110 pulse per second with 1mJ of power at each pulse. which reduces the risk of experiment accidents for instance damaging optical fiber cable, intensity spectrometer or other equipment in the laboratory. Since the single-mode fiber’s diameter is very small (9 microns), it was nearly impossible to align the ray of laser light and cable every time the angle changes. Therefore, a highresolution mirror is used to adjust the angles if incidence and one end of the cable is stabilized on a platform that enables only 1-dimensional motion. Rotating the mirror on a fixed change the angle of reflection, this caused differences in angles if incidence from air to core to optical fiber cable. The signal is traveled along the core of cable, constantly bouncing from cladding, which has smaller refractive index to apply the principal called total internal reflection. The other end of the optical fiber cable is connected to an intensity spectrometer to observe the changes in the output intensity as the angle if incidence changes. The output intensity remained same until a certain angle, which is the critical angle, then it begun to decrease as the angle of incidence for the light passing from the air to core of the optical fiber increases.

Item Type: Thesis (Other)
Additional Information: IB Notu: D
Uncontrolled Keywords: Optical Fiber Cables
Subjects: Q Science > QC Physics
Depositing User: Kamil Çömlekçi
Date Deposited: 12 Sep 2014 12:34
Last Modified: 12 Sep 2014 12:34
URI: http://tedprints.tedankara.k12.tr/id/eprint/555

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