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报道了一种新型全光纤离散可调谐分布反射(DBR)光纤激光器。光纤激光器为短腔结构,其有源区采用Er-Yb共掺单模光纤,有源光纤长度为6 cm。激光器采用两组级联光纤布拉格光栅(FBG)为反射腔镜,前腔镜各级联光纤布拉格光栅的布拉格波长间隔为1 nm,后腔镜为0.8 nm,利用游标原理,通过对前腔镜级联光纤布拉格光栅进行机械调谐,使前后腔镜各反射波长分别对准,实现了四个固定波长间隔为0.8 nm的离散调谐。这种光纤激光器具有波长调节准确,调谐速度快,成本低的优点,可用于作为多波长光纤传输系统的发射光源或系统检测光源,进一步增加级联光栅的组数可实现更大调谐范围。
A new all-fiber discrete tunable distributed-reflect (DBR) fiber laser is reported. The fiber laser is a short cavity structure, and its active region is Er-Yb co-doped single-mode fiber. The active fiber length is 6 cm. Two cascaded fiber Bragg gratings (FBGs) are used as the reflecting mirrors in the laser. The Bragg wavelength of the cascaded fiber Bragg gratings in the front cavity mirror is 1 nm and the back cavity mirror is 0.8 nm. By using the cursor principle, Cascaded Fiber Bragg Gratings are mechanically tuned so that the reflected wavelengths of the front and back end mirrors are aligned separately, enabling four discrete tunings with fixed wavelength spacing of 0.8 nm. The fiber laser has the advantages of accurate wavelength adjustment, fast tuning speed and low cost. The fiber laser can be used as a light emitting source or a system detection light source of a multi-wavelength optical fiber transmission system, and a group of cascaded gratings can be further increased to realize a larger tuning range.