Study the Polarization States of the Light Signals Extracted from the Amplified Spontaneous Emissions

• Main Authors: Lin-Cai Jyun, 林才郡
• Other Authors: Wu-Chi Chen
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/16879863189668290635

碩士 === 高苑科技大學 === 電子工程研究所 === 101 === Awareness of the polarization states is critical to design the high-speed long-distance fiber optic systems and high channel-capacity CATV distribution systems. The work is motivated by the desires to explore and study the polarization stats of the light signals extracted from the amplified spontaneous emissions. The air-suspended optical table was used to prevent the changes of the polarization states from vibrations. The thermoelectric coolers were used to control the stability of the temperature. Therefore, the laser used to drive the erbium-doped fiber can achieve the stability of the output light. Optical tunable filters were used to select the wavelengths of the polarization light signals. The three normalized Stokes parameter (s1, s2, s3) traces obtained from a polarimeter were used to analyze the output polarizations over wavelength. We saw the polarization state changed from the left-hand polarization states to the right-hand polarization states within the wavelength ranges between 1534.04 nm to 1535.06 nm. The polarization states changed from the right-hand polarization states to the left-hand polarization states within the wavelength ranges between 1536.09 nm to 1536.13 nm. Our results suggest the fluctuations of the polarization states were mainly affected by the normalized Stoke parameter s3 and the degree of polarization increased as optical power decreased. There is a quite close inverse relationship between the degree of polarization and optical power.