基于传统单模全光纤结构的宽带可调谐轨道角动量模式转换器。

Broadband tunable orbital angular momentum mode converter based on a conventional single-mode all-fiber configuration.

作者信息

Zhou Min, Zhang Zhe, Shao Laipeng, Liu Shen, Liu Yu, Pang Yu, Bai Zhiyong, Fu Cailing, Cui Wei, Qi Lin, Wang Yiping

出版信息

Opt Express. 2021 May 10;29(10):15595-15603. doi: 10.1364/OE.421967.

DOI:10.1364/OE.421967

Abstract

A broadband tunable orbital angular momentum (OAM) mode converter based on a helical long-period fiber grating (HLPFG) inscribed in a conventional single-mode fiber (SMF) is experimentally demonstrated. The proposed all-fiber OAM mode converter is based on the core-cladding mode dual resonance near the dispersion turning point (DTP). The converter can operate with a bandwidth of 303.9 nm @ -3 dB and 182.2 nm @ -10 dB, which is, as far as we know, the widest bandwidth for a conventional SMF. Furthermore, the bandwidth of the OAM mode can be dynamically tuned within a large dynamic range (>80 nm) by simply twisting the fiber clockwise (CW) or counterclockwise (CCW). The dynamic tunability of the bandwidth of the proposed OAM mode generator may find vital applications in large-capacity optical fiber communication systems.

摘要

实验展示了一种基于刻写在传统单模光纤（SMF）中的螺旋长周期光纤光栅（HLPFG）的宽带可调谐轨道角动量（OAM）模式转换器。所提出的全光纤OAM模式转换器基于色散转折点（DTP）附近的纤芯-包层模式双共振。据我们所知，该转换器在-3 dB时带宽为303.9 nm，在-10 dB时带宽为182.2 nm，是传统单模光纤中最宽的带宽。此外，通过简单地顺时针（CW）或逆时针（CCW）扭转光纤，OAM模式的带宽可以在很大的动态范围内（>80 nm）动态调谐。所提出的OAM模式发生器带宽的动态可调谐性可能在大容量光纤通信系统中找到重要应用。