A silicon nanowire embedded dual-core pentagonal photonic crystal fiber (PCF)-based polarization-independent wavelength splitter is proposed. The proposed PCF structure is analyzed using the finite element method. The wavelength splitting behavior of the PCF is investigated using the coupled-mode theory. The structural parameters of the PCF are optimized to achieve a coupling length ratio of 2. For the proposed PCF of length 102 μm, the cross-talk (CT) of −48.27 and −61.54 dB and CT bandwidth of 29.3 and 37.7 nm at 1.3 and 1.55 μm for X-polarization mode is achieved. However, the proposed PCF of length 115.5 μm attained the CT of −42.83 and −46.74 dB and CT bandwidth of 27.6 and 34.5 nm at 1.3 and 1.55 μm, respectively for Y-polarization mode. The polarization-independent wavelength splitter is achieved with the proposed PCF of length 108.75 μm. The proposed PCF-based wavelength splitter will be an inevitable candidate for integrated optical systems.

中文翻译：

---

基于硅纳米线的嵌入式双芯五边形晶格光子晶体光纤的偏振无关分光器，用于光通信系统

提出了一种基于硅纳米线嵌入式双核五角形光子晶体光纤（PCF）的偏振无关波长分离器。所提出的PCF结构使用有限元方法进行了分析。使用耦合模式理论研究了PCF的波长分裂行为。对PCF的结构参数进行了优化，以使耦合长度比达到2。对于建议的长度为102μm的PCF，在1.3时的串扰（CT）为-48.27和-61.54 dB，CT带宽为29.3和37.7 nm X极化模式为1.55μm。但是，对于Y偏振模式，建议的长度为115.5μm的PCF分别在1.3和1.55μm处获得-42.83和-46.74 dB的CT以及27.6和34.5 nm的CT带宽。所建议的PCF长度为108.75μm，可以实现偏振无关的分光器。