高飽和輸出功率S頻帶摻鉺光纖放大器之研究｜國立清華大學博碩士論文庫

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研究生：	張翔榮 Chang, Hsiang-Jung
論文名稱：	高飽和輸出功率S頻帶摻鉺光纖放大器之研究 The studies of high saturation output power S-band erbium-doped fiber amplifiers
指導教授：	張彌彰 Chang, Mi-Chang
口試委員:
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 電子工程研究所 Institute of Electronics Engineering
論文出版年：	2009
畢業學年度：	97
語文別：	英文
論文頁數：	44
中文關鍵詞：	摻鉺光纖放大器、S頻帶、高飽和輸出功率
外文關鍵詞：	erbium-doped fiber amplifier, S-band, high saturation output power
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In this thesis, we demonstrate a high saturation power S-band erbium-doped fiber amplifier (EDFA) by employing high cutoff efficiency C-band ASE suppression filters located in standard C-band silica-based EDFs. First of all, we have made wideband tunable (1250 ~ 1650 nm) fused-tapered short-pass fiber filters with high cutoff efficiency and temperature-tuning efficiency (50 nm/□C) by properly choosing the applied dispersive material and the tapered fiber structure. As a result, the saturation input and output power for 1490-nm S-band EDFA using standard EDF are improved to be about +8.8 dBm and +12.2 dBm respectively, under 980 nm pump power of 200 mW in a forward-pumping configuration with a gain of 6 dB. Based on these results, already better than our previous reported results in a higher gain S-band EDFA case, a higher saturation output power can be achieved along with a larger gain by using longer lengths of EDF with more in-line C-band ASE suppression fiber filters.

在此論文中，我們說明了採用高截止效率的抑制C頻帶放大自發幅射濾波器的高飽和功率S頻帶摻鉺光纖放大器，而濾波器置放於C頻帶矽基摻鉺光纖之中。首先，我們製作了寬頻帶(1250~1650 nm)的熔拉低通濾波器，其中透過適當的選用色散材料和熔拉光纖結構，就能夠達到高截止效率與高溫度調整效率(50 nm/□C)。最終在採用順向激發架構下，200mW的980nm激發功率可得到6dB的增益，並改善了1490-nm S頻帶摻鉺光纖放大器的飽和輸入功率和飽和輸出功率，分別可達到8.8 dBm和12.2 dBm，這些結果已經比過去一些高增益S頻帶摻鉺光纖放大器的例子還要佳。只要能使用更長的摻鉺光纖並在其中置放更多的C頻帶放大自發幅射濾波器，將可得到更高的增益和更高的飽和輸出功率。

Contents

Abstract (in English)…………………………………………………...I
Abstract (in Chinese)………………………………………………….II
Acknowledgement (in Chinese)…………………………………...…III
Contents………………………………………………………………IV
List of Figures…………………………………………………………V

Chapter 1 Introduction…………………………………………………1
1.1 Review of erbium-doped fiber amplifier…………………………1
1.2 Motivation of the thesis…………………………………………..2
1.3 Structure of the thesis…………………………………………….5
Chapter 2 Principle……………………………………………………..6
2.1Principles of S-band erbium-doped fiber amplifier…………….....6
2.2 Dispersion in single-mode fiber………………………………...12
2.2.1 Dispersion………………………………………………..12
2.2.2 Material dispersion……………………………………….14
2.2.3 Waveguide dispersion……………………………………..15
2.3 Dispersion engineering on optical fibers……………………….17
Chapter 3 Fabrication and experimental set-up……………………..21
3.1 Thermo-tunable short-wavelength-pass fused-tapered fiber                 filter…………………………………………………………….21
3.1.1 Introduction………………………………………………21
3.1.2 Experimental set-up………………………………………23
3.2 S-band EDFA by using ASE suppressing filters………………...26
3.2.1 Introduction………………………………………………26
3.2.2 Experimental set-up………………………………………28
Chapter 4 Measurement and discussion……………………………...32
    4.1 High cutoff efficiency of short-pass fiber filter………………...32
    4.2 High saturation power S-band EDFA…………………………..35
Chapter 5 Conclusions………………………………………………...40
Reference……………………………………………………………….42

List of Figures

Fig. 2.1 The three-level systems used for the EDFA model……………………….......7
Fig. 2.2 A prism disperses with light………………………………………...……….13
Fig. 2.3 The refractive index dispersion curves for germanium-silicate at the                different doping concentrations of germanium……………………………18
Fig. 2.4 Slope difference of germanium-silicate glass with respect to fused                    silica……………………………………………………………………….19
Fig. 3.1 Diagram of a tapered fiber structure with a uniform waist……………….....23
Fig. 3.2 The tapering station…………………………………………………………24
Fig. 3.3 Schematic diagram of the tapering station used to fabricate the tapered             fibers. The z-arrows indicate the direction of movement. LF is the length of         oscillation of the flame torch. SMF-28, single-mode fiber………………..24
Fig. 3.4 Experimental set-up of the high saturation power S-band EDFA…………..28
Fig. 3.5 Refractive index dispersion curves for the index matching liquid (blue) and         the effective index of the tapered fiber (red) at different temperatures…………31
Fig. 4.1 Fused-tapered fiber short-pass filter…………………………………….......32
Fig. 4.2 Spectral responses of the tapered fiber short-pass filters using a Cargille             liquid with nD = 1.456 at different temperatures…………………………33
Fig. 4.3 Spectral reponses of the taperd fiber in the straight and bending                    conditions………………………………………………………………….34
Fig. 4.4 The ASE spectra of a S-band EDFA with 6-m-long EDF and an in-line            filter under different 980-nm pump powers…………………………………….36
Fig. 4.5 The signal gain versus pump power at 1486.9-nm wavelength for different        input signal power at 6-m-long EDF with an in-line ASE filter………………..37
Fig. 4.6 Signal gain versus signal input power at 1490nm wavelength for 3-m EDF        and 6-m EDF with an in-line filter………………………………………...........38

                                

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