Liu Shidi, Zhang Liang, Tian Ming, Yang Tianyu, Dong Yuming
Opt Express. 2021 May 10;29(10):15664-15677. doi: 10.1364/OE.427149.
A broadband single-polarization single-mode (SPSM) hollow core anti-resonant photonic crystal fiber (HC-ARPCF) is proposed and analyzed by the finite element method in this paper. The HC-ARPCF design consisted of outer semicircular cladding tubes and inner circular cladding tubes. The SPSM behavior is achieved through controlling the effective material absorption loss (EML) by loading epsilon negative (ENG) material in the selected semicircular cladding tubes. Optimization of the configuration parameters is conducted to yield a large loss difference (LD) between one of the two orthogonally polarized fundamental modes and all the other unwanted modes. Therefore, only one desired mode will exist after a proper propagation distance, i.e., SPSM guidance. Specially, the optimal design provides a 288 nm (from 1408 nm to 1676 nm and from 1680 nm to 1700 nm) bandwidth in terms of 40 dB/m minimum LD (MLD) and 168 nm (from 1452 nm to 1620 nm) bandwidth in terms of 100 dB/m MLD. Furthermore, this fiber also exhibits a large effective mode area and near-zero dispersion properties over the entire operation bandwidth. The proposed HC-ARPCF may find its applications in polarization maintaining and high-power laser systems.
本文提出了一种宽带单偏振单模（SPSM）空心反谐振光子晶体光纤（HC - ARPCF），并采用有限元法对其进行了分析。该HC - ARPCF的设计由外部半圆形包层管和内部圆形包层管组成。通过在选定的半圆形包层管中加载负介电常数（ENG）材料来控制有效材料吸收损耗（EML），从而实现SPSM特性。对结构参数进行优化，以使两个正交偏振基模之一与所有其他不需要的模式之间产生较大的损耗差（LD）。因此，在适当的传播距离之后，将仅存在一种所需模式，即SPSM导波。特别地，优化设计在40 dB/m的最小损耗差（MLD）条件下提供了288 nm（从1408 nm至1676 nm以及从1680 nm至1700 nm）的带宽，在100 dB/m的MLD条件下提供了168 nm（从1452 nm至1620 nm）的带宽。此外，这种光纤在整个工作带宽内还具有大的有效模面积和近零色散特性。所提出的HC - ARPCF可在保偏和高功率激光系统中找到其应用。
