Abstract
Optical fibers are widely used in communication and information systems. This needs studying the factors that affect signal quality. In this work and optical fibers having two different laser beams passing through it were exposed to heat by raising temperature from 30°C to 50°C in steps of 2°C. The empirical relation shows linear increase of attenuation coefficient with temperature. This linear relation can shows that the temperature sensitivity of semiconductor and He-Ne laser are 0.01 and 0.4 respectively. This means that using He-Ne laser in transmitting information is better than semiconductor laser because the former is less sensitive to temperature. It also shows that semiconductor laser is suitable to make fiber act as temperature sensor, since its sensitivity is high.
Highlights
The first theoretical foundation of LASER (Light Amplification by Stimulated Emission of Radiation) and MASER (Microwaves Amplification by Stimulated Emission of Radiation) was given by Einstein in 1917 using Plank’s law of radiation that was based on probability coefficients (Einstein coefficients) for absorption and spontaneous and stimulated emission of electromagnetic radiation
Laser beams passing through optical fiber and it was exposed to heat by raising temperature from 30°C to 50°C in steps of 2°C
The attenuation coefficient ∝ was found at each temperature by using equation (11) and measuring input voltage and output voltage of the laser signal (He-Ne) and semiconductor
Summary
The first theoretical foundation of LASER (Light Amplification by Stimulated Emission of Radiation) and MASER (Microwaves Amplification by Stimulated Emission of Radiation) was given by Einstein in 1917 using Plank’s law of radiation that was based on probability coefficients (Einstein coefficients) for absorption and spontaneous and stimulated emission of electromagnetic radiation. Light produced from the lasers have several valuable characteristics not shown by light obtained from other conventional light sources, which make them suitable for a variety of scientific and technological applications These properties are: Theoretically, waves of light with single frequency ν of vibration or single wavelength λ is termed as single color or monochromatic light source. No source of light including laser is ideally monochromatic. Different attempts were made to account for the effect of temperature change on optical fiber system [ ]. This paper is devoted for comparing the effect of temperature change on the attenuation coefficient of optical fiber when two laser types [He-Ne and solid state laser] passes through it.
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