使用高精細度Fabry-Pérot共振器之10GHz光頻穩定鎖模光纖雷射

10 GHz optical-frequency-stabilized mode-locked fiber laser based on a high finesse Fabry-Pérot etalon

陳則維(Tse-Wei Chen)

指導教授 ： 賴暎杰

國立交通大學/電機學院/光電工程系所/碩士(2019年)

摘要

在本論文中, 我們使用振幅調變器做為主要的鎖模元件, 建構了一套摻鉺鎖模光纖雷射, 其共振腔主要由可調式帶通濾波器, 可調式光學延遲器, 光學隔離器, 光振幅調變器以及摻鉺光纖所組成. 為了達到單一鎖模模態輸出, 額外加入了一個高精細度的Fabry-Pérot共振器作為光梳狀濾波器, 配合共振腔腔長控制, 成功抑制超模噪音. 為了進一步穩定雷射, 在共振腔外架了一套回授控制系統, 藉由雷射輸出頻率與不同參考頻率產生的差頻訊號, 送進比例積分微分器進行計算, 將回授訊號回饋給腔內調整元件, 實現了雷射較長期的穩定.

關鍵字

鎖模光纖雷射 ； Fabry-Pérot共振器 ； 光頻穩定 ； 超模抑制

並列摘要

In this thesis, we use an EO modulator as the mode locker to construct an erbium-doped mode-locked fiber laser. The laser mainly consists of a tunable band-pass filter, a tunable optical delay line, an optical isolator, an amplitude modulator and a piece of erbium-doped fiber. To achieve the single mode-locking state output, we add a high finesse Fabry-Pérot etalon as an optical comb filter. With the control of the length of resonance cavity, the supermode noise is suppressed successfully. To further stabilize the laser operation, we build a feedback control system outside the cavity. The beat note produced between the laser output and the reference frequency signal is sent to the PID controller. The signal produced by the PID controller is then sent to the intra-cavity time delay components as the feedback signal. The longer term stabilization of the laser is achieved.

並列關鍵字

mode-locked fiber laser ； Fabry-Pérot etalon ； optical-frequency-stabilize ； supermode suppression

參考文獻

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[3] Pottiez, Olivier, et al. “Supermode noise of harmonically mode-locked erbium fiber lasers with composite cavity.” IEEE journal of quantum electronics 38.3 (2002): 252-259.

[4] Ozdur, Ibrahim, et al. “A Semiconductor-Based 10-GHz Optical Comb Source with Sub 3-fs Shot-Noise-Limited Timing Jitter and ~ 500-Hz Comb Linewidth.” IEEE Photonics Technology Letters 22.6 (2010): 431-433.

[5] Bagnell, Kristina, et al. “Demonstration of a highly stable 10 GHz optical frequency comb with low timing jitter from a SCOWA-based harmonically mode-locked nested cavity laser.” Optics letters 43.10 (2018): 2396-2399.