中国激光, 2020, 47 (8): 0806001, 网络出版: 2020-08-17
基于三个非对称光纤布拉格光栅的双腔窄带宽双波长透射 下载: 711次
Ultranarrow Dual-Transmission Properties of a Two-Cavity Structure Based on Three Asymmetric Fiber Bragg Gratings
光纤光学 光纤布拉格光栅 双透射 双腔结构 光纤激光器 fiber optics fiber Bragg gratings dual-transmission two-cavity structure fiber lasers
摘要
研究了由三个非对称光纤布拉格光栅(FBG)构成的双腔结构的双波长透射特性。三个FBG之间的周期(或布拉格波长)不同,导致它们的禁带部分重叠,形成两个重叠区域。通过调节FBG的周期来控制每个重叠区域的大小,使每个重叠区域只允许一个波长通过,从而实现双波长透射。如果在双透射情况下增加腔长,则透射带宽会被压窄,从而获得超窄带宽。此外,两个透射波长之间的间隔可通过改变FBG的周期而改变。基于该全光纤结构的设计思路,可以将其进一步推广以实现等间隔甚至是不等间隔的多波长透射。该结构在双波长或多波长光纤激光器领域具有潜在应用价值。
Abstract
In this study, the dual-transmission properties of a two-cavity structure comprising three asymmetric fiber Bragg gratings (FBGs) are investigated. The periods or Bragg wavelengths of the three FBGs are different from each other, causing their three stopbands to partially overlap and resulting in two overlapped regions. The sizes of these overlapped regions can be controlled by tuning the FBG periods. In addition, only one wavelength can be transmitted from each of the overlapped regions. Thus, dual-transmission is achieved. However, dual transmission will exhibit an ultranarrow bandwidth if a long cavity is considered. Further, the spacing between two wavelengths can be altered by adjusting the FBG periods. The all-fiber structure proposed in this study can be extended to achieve multiple transmissions exhibiting equal or unequal spacings. The proposed structure can be potentially applied in dual- or multi-wavelength fiber lasers.
陈建, 邓立, 钮月萍, 龚尚庆. 基于三个非对称光纤布拉格光栅的双腔窄带宽双波长透射[J]. 中国激光, 2020, 47(8): 0806001. Chen Jian, Deng Li, Niu Yueping, Gong Shangqing. Ultranarrow Dual-Transmission Properties of a Two-Cavity Structure Based on Three Asymmetric Fiber Bragg Gratings[J]. Chinese Journal of Lasers, 2020, 47(8): 0806001.