Investigation of High Gain L-band Erbium Doped Fiber Amplifier with Different Structure

• Main Authors: Yung-Hsiang Lo, 羅詠翔
• Other Authors: Jeng-Cherng Dung
• Format: Others
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/4x42w2

碩士 === 國立東華大學 === 電機工程學系 === 102 === In this paper, we experimented four different architectures to achieve a goal of high gain and low noise figure with L-band erbium doped fiber amplifier that were in the same medium length and total pump power. First, we structured a single stage L-band erbium doped fiber amplifier (EDFA) to investigate the gain characteristic. Second, we structured a two-stage L-band EDFA to investigate the gain characteristic. Finally, we used a Faraday rotator mirror (FRM) and an optical circulator to structure two reflective type two-stage L-band EDFAs. The type 1 was that let the second stage of the EDFA double pass. The type 2 was that let the first stage of the EDFA double pass. And we demonstrated each architecture optimized configuration of pump power. The two-stage L-band EDFA is better than the single-stage L-band EDFA on the aspect of gain, and the gain was improved by 4dB from 1572 nm to 1588 nm. The reflective type two-stage L-band EDFA is better than the two-stage L-band EDFA on the aspect of the gain, and the gain was improved by 5dB from 1588 nm to 1608 nm. In the architecture of two-stage L-band erbium-doped fiber amplifier, we interchanged the gain medium length without a difference for gain, but the noise figure was improved approximately by 0.6dB. In the architecture of reflective type two-stage L-band EDFA, we interchanged the positions of EDFA without a difference for gain, but the noise figure was improved approximately by 2dB.