Lin Wei, Zhang Hao, Song Binbin, Miao Yinping, Liu Bo, Yan Donglin, Liu Yange
Opt Express. 2015 May 4;23(9):11123-34. doi: 10.1364/OE.23.011123.
In this paper, a magnetically controllable wavelength-division-multiplexing (WDM) fiber coupler has been proposed and experimentally demonstrated. A theoretical model has been established to analyze the influences of the weak as well as strong couplings to the wavelength tunability of this coupler. Experimental results show that the operation wavelength tunability of the proposed WDM coupler could be fulfilled for an applied magnetic field intensity range of 0 Oe to 500 Oe, and particularly it possesses high operation performances within the magnetic field intensity ranging from 25 Oe to 125 Oe when additional transmission loss and isolation are both considered. Within this range, the two selected channels show the wavelength tunability of 0.05 nm/Oe and 0.0744 nm/Oe, respectively, and the isolation between the two branches is higher than 24.089 dB. Owing to its high isolation, good splitting ratio stability, and high wavelength tunability, the proposed controllable WDM coupler is anticipated to find potential applications in such fields as fiber laser, fiber sensing and fiber-optic communications. Moreover, the fiber coupler integrated with the magnetic fluid would be valuable for the design of magnetically controllable mode-division-multiplexing devices.
本文提出并通过实验验证了一种磁控波分复用（WDM）光纤耦合器。建立了理论模型来分析弱耦合和强耦合对该耦合器波长可调性的影响。实验结果表明，所提出的WDM耦合器在0 Oe至500 Oe的外加磁场强度范围内可实现工作波长可调性，特别是在同时考虑额外传输损耗和隔离的情况下，在25 Oe至125 Oe的磁场强度范围内具有较高的工作性能。在此范围内，两个选定通道的波长可调性分别为0.05 nm/Oe和0.0744 nm/Oe，两个分支之间的隔离度高于24.089 dB。由于其高隔离度、良好的分光比稳定性和高波长可调性，所提出的可控WDM耦合器有望在光纤激光器、光纤传感和光纤通信等领域找到潜在应用。此外，集成磁流体的光纤耦合器对于磁控模分复用器件的设计具有重要价值。
