Tightly Bunched Soliton Pulses in Passively Mode-locked Erbium-doped Fiber Laser Based on Nonlinear Polarization Rotation with Central Wavelength Tunability

It is demonstrated that the bunched solitons from the passively mode-locked erbium-doped fiber laser (EDFL) can be achieved with the assistance of strong polarization-dependent loss. There are as many as 18 solitons tightly bunched together at the maximum pump power of up to 325 mW. Such a tightly bunched package can be elucidated by the soliton energy quantisation and the long-range soliton interaction according to the perturbation theory. Moreover, based on the combined effects of the fiber birefringence and the cavity filtering in the laser cavity, the central wavelength tunable EDFL is developed. By bending the intracavity fiber to induce the refractive index difference between the fast and slow axes, the wavelength tunable range is regime and 10.2 nm at 1600 nm regime. Therefore, it is potential for many applications to utilize the passively mode-locked EDFL as the ultrafast light source.

關鍵字

Passively mode-locked erbium-doped fiber laser ； Bunched soliotons ； Wavelength tenability

並列摘要

在本研究中，利用極化相依之功率衰減效應完成了束縛態光固子群輸出的被動鎖模摻鉺光纖雷射。基於光固子微擾理論，當摻鉺光纖雷射達到一定增益以上時，將會迫使光固子分裂，此時光固子之間的長作用力在特定極化情況下，會造成光固子群形成束縛態可能性。，在最大增益（泵浦功率等於325毫瓦）的實驗條件下，輸出的束縛態光固子數量可以達到18個。本實驗另一部分，應用光纖雙折射與腔內極化線性濾波的合併效應，產生中心波長可調的非線性極化旋轉機制被動鎖模摻鉺光纖雷射，藉由彎曲雷射腔內的光纖形成半徑為3至1公分的極小光纖環圈，迫使光纖中快軸與慢軸的折射率差異增加產生相位差，在1600奈米波段的可調範圍可以達到至10.2奈米，進一步拓展了被動鎖模摻鉺光纖雷射應用之。

並列關鍵字

被動鎖模摻鉺光纖雷射；束縛態光固子群；波長可調性

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