Luo Pengtao, Chen Fengyi, Li Xingyong, Zhu Wenhua, Bao Weijia, Wang Ruohui, Qiao Xueguang
Opt Lett. 2022 Jun 15;47(12):3127-3130. doi: 10.1364/OL.460261.
We propose an ultrahigh-order fiber Bragg grating (UHO-FBG) containing dense resonants and its application as a novel filtering device in multi-wavelength lasers. The UHO-FBG is fabricated by femtosecond laser plane-by-plane direct inscription. Thanks to the plane-by-plane inscription, high-order Bragg resonances can be formed with multiple reflectance peaks of comparable reflectance in the range of the fiber operating bandwidth and without the transmission depression of long-period gratings in the transmission spectrum. We also experimentally demonstrate the use of UHO-FBG pairs in a distributed Bragg reflector laser, enabling the excitation of multi-wavelength lasers.
我们提出了一种包含密集谐振器的超高阶光纤布拉格光栅（UHO-FBG）及其作为多波长激光器中新型滤波器件的应用。该UHO-FBG通过飞秒激光逐平面直接写入法制造。得益于逐平面写入，在光纤工作带宽范围内可形成具有多个反射率相当的反射峰的高阶布拉格谐振，且在透射光谱中不存在长周期光栅的透射凹陷。我们还通过实验证明了在分布式布拉格反射器激光器中使用UHO-FBG对可实现多波长激光器的激发。
