本論文主旨為闡述窄線寬光纖雷射之研製，首先經由實驗量測去決定自製雷射的各項參數，決定使用前向泵激，泵激光源波段為980nm，摻鉺光纖長度為12m，光柵波段為1551.95nm，反射率為98.34%，光耦合元件選用90：10，並且在背向雷利散射的原理下，加入一段120m的單模光纖，與光衰減器和反射鏡，不僅能使得線寬縮窄，也能夠藉由調整光衰減器，讓原來的多模的情況達到單縱模輸出，實驗結果中顯示，以上參數所能得到的功率與信噪比為2.816 mW與59.86 dB，接著第二個部分講述線寬量測架構之參數設置，主要需要設置上半部為聲光調變器而下半部為單模光纖長度，在聲光調變器的設定中，先給予電壓24V，電流0.8A，接著調整脈波產生器，輸出一個脈衝寬度為100ns，脈衝重複率為1ms(1kHz)的數位訊號，振幅設定為2.3V。另一個部分則利用相干長度公式去決定單模光纖所需要的長度，經過計算後雷射的相干長度約為66km，並決定使用3捆25km，總長75km的延遲光纖，而在建置完後實際量測四種不同線寬之雷射，得到的實驗結果分別為2.6kHz，1.35MHz與1.69MHz，而本論文重點量測窄線寬光纖雷射之線寬為4.176kHz，在確認雷射的線寬後，最後一部分講述窄線寬光纖雷射量測其光纖通訊架構下之數值，並加入濾波器將原來SNR只有40.14dB，提升至58.64 dB，此數值與原訊號相差不遠，改善通訊架構後，測試在PRBS7的情況下傳輸10 Gbit/s時的誤碼率，目的為比較不同線寬其誤碼之差異，以線寬2.6kHz雷射為基準實驗結果顯示，功率在-18dBm時有著10-11之誤碼率，而可調式雷射光源與陣列雷射在10-9功率償付之值分別為0.87dB和1.48dB，以及窄線寬光纖雷射則有著2.33dB之功率償付。

The main purpose of this thesis is to explain the development of a narrow linewidth fiber laser. The forward pump laser source has a wavelength of 980 nm, and an erbium-doped fiber length of 12 m is used in this thesis. A fiber grating with 1551.95 nm and 98.34% reflectivity is used. The optical coupler is selected as 90:10, a section of 120 m single-mode fiber is added under the principle of Rayleigh backscattering, with an optical attenuator and a reflector, it can narrow the line width and adjust the optical attenuator to achieve single-mode output in the multi-mode situation. The experimental results show that the power and signal-to-noise ratio that can be obtained with the above parameters are 2.816 mW and 59.86 dB, respectively. It is necessary to set the upper half of the acousto-optic modulator and the lower half of the single-mode fiber length for the linewidth measurement architecture parameter setting. The acousto-optic modulator is using 24 Volt of electrical power and 0.8 Ampere of current. While the pulse generator is adjusted to a digital signal output with a pulse width of 100 ns and a pulse repetition rate of 1 ms (1 kHz) with 2.3 Volt of amplitude. The other part uses the coherence length formula to determine the required length of the single-mode fiber. The length of the delay fiber needs to be greater than the coherence length of the laser. The two optical paths of the upper half and the lower half have similar linewidths, and they can be regarded as two similar laser sources. It is used as interference to detect the electrical signal to analyze its linewidth. Therefore, after calculation, the coherence length of the laser is about 66km. Finally, it is decided to use 3 bundles of 25 km delay fiber with a total length of 75 km. After measuring four different linewidth lasers, the experimental results obtained are 2.6kHz and 1.35MHz and 1.69MHz, respectively and this paper focuses on measuring the linewidth of the narrow linewidth fiber laser as 4.176 kHz. After confirming the laser linewidth, the last part describes the value of the narrow linewidth fiber laser measurement under the optical fiber communication architecture, adding a filter to increase the original SNR from 40.14 dB to 58.64 dB. This value is not far from the original signal. After improving the communication architecture, the bit error rate is evaluated using 10 Gbit/s under PRBS7 based on the line width 2.6kHz laser. It can obtain the 10-11 bit error rate at -18dBm of optical power. The compensation values in 10-9 of the adjustable laser light source and the array laser are 0.87dB and 1.48dB, respectively, and the narrow linewidth fiber laser has a 2.33 dB of power compensation.

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