Wang Dongdong, Jiang Yanfei, Geng Xiang, Yang Bo, Li Li
Opt Express. 2021 May 10;29(10):14384-14393. doi: 10.1364/OE.419826.
In this paper, asymmetric biconical fiber tapers (ABFTs) for in-fiber Mach-Zehnder interferometers (IFMZIs) are proposed and analyzed to enhance the interference effect. The proposed ABFT-IFMZIs are fabricated, tested, and demonstrated in applications of single-frequency (SF) emissions when incorporated into an all-fiber laser cavity as the frequency selecting component. In comparison with the traditional IFMZIs composed of all symmetric biconical fiber tapers (SBFTs), higher average transmittance and fringe contrast have been demonstrated with the ABFT-based IFMZIs. When applied to the SF fiber laser emission, lower pump threshold and higher slope efficiency have also been confirmed with the ABFT-IFMZI device. The theoretical and experimental results have indicated that the interference effect of IFMZIs can indeed be improved by the designated asymmetry of conical taper angles in ABFTs that can offer an extra flexibility in fiber taper design, fabrication, and applications.
本文提出并分析了用于光纤马赫-曾德尔干涉仪（IFMZI）的非对称双锥形光纤锥（ABFT），以增强干涉效果。所提出的ABFT-IFMZI被制作、测试，并在作为频率选择元件并入全光纤激光腔时用于单频（SF）发射的应用中得到了验证。与由全对称双锥形光纤锥（SBFT）组成的传统IFMZI相比，基于ABFT的IFMZI具有更高的平均透过率和条纹对比度。当应用于SF光纤激光发射时，ABFT-IFMZI器件还具有更低的泵浦阈值和更高的斜率效率。理论和实验结果表明，通过ABFT中锥形锥角的特定不对称性确实可以改善IFMZI的干涉效果，这可以在光纤锥的设计、制作和应用中提供额外的灵活性。
