• Suresh Kumar
• Parshant Sharma

Study of Numerical Aperture of Single Mode Optical Fibre Suresh Kumar1, Parshant Sharma2 1Assistant Professor, Department of Physics NSCBM Govt. College Hamirpur, Himachal Pradesh, 177005, India 2Assistant Professor, Department of Physics NSCBM Govt. College Hamirpur, Department of Physics, 177005, India ABSTRACT To use optical fibres it is useful to know their numerical apertures. In this paper we focus on the numerical aperture of the single mode optical fibre which a measure for its angular acceptance for incoming light. It is defined based on geometrical considerations and is thus a theoretical parameter which is calculated from the optical design. If it is sufficient to transmit the light at the input with an aperture lower than the theoretical aperture without core stopping, it is very useful to know the numerical aperture. We measure the numerical aperture by calculating the mean diameter and then the radius of the spot circle. We also measure the distance of the fibre from the target. Then make a ratio between the radius of the spot circle and the distance. From here we calculate the acceptance angle and then numerical aperture by sin of acceptance angle. Keywords: Optical fibre, numerical aperture, acceptance angle

Optical fibre, numerical aperture, acceptance angle

"Study of Numerical Aperture of Single Mode Optical Fibre", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.11, Issue 6, page no.d313-d328, June-2024, Available :http://www.jetir.org/papers/JETIR2406339.pdf

"Study of Numerical Aperture of Single Mode Optical Fibre", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.11, Issue 6, page no. ppd313-d328, June-2024, Available at : http://www.jetir.org/papers/JETIR2406339.pdf