| Summary: | 碩士 === 國立高雄應用科技大學 === 電子與資訊工程研究所碩士班 === 96 === In the optical fiber communications, the operating wavelength range has been extended from the conventional band (C-band, 1520nm-1560nm) to the long-wavelength band (L-band, 1560nm-1620nm), because of the need in the bandwidth for data transmission. Generally, the L-band erbium-doped fiber amplifier (EDFA) can amplify well the L-band signal, but its pump efficiency is low.
In this thesis, we first simulate and analyze numerically the characteristics of L-band EDFA through MATLAB. It is found that the gain and pump efficiency could be improved by using shorter EDFs. By our results of analysis, we propose a multi-stage L-band EDFA to improve the pump efficiency. Using the EDF of total length 50m and pump source of total power 70mW, our simulation results show that the gain of single-stage EDFA is 2.3dB; the gain of 2-stage EDFA is 15.5dB; and the gain of 5-stage EDFA is 17.9dB. The useful wavelength range can be improved from 12nm for the single-stage EDFA, to 60nm for the 5-stage EDFA.
Then, using the EDF of total length 50m and pump source of total power 70mW, our experimental results show the gain of 5-stage EDFA is 8dB higher than the single-stage EDFA and the useful range can be extended from 19nm for the single-stage EDFA to 40nm for the 5-stage EDFA. A good agreement between our simulations and our experimental results is observed for the multi-stage L-band EDFA.
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