Abstract
A high performance polarization beam splitter is designed. It is based on a liquid-filled dual-core photonic crystal fiber (DC-PCF), and possesses ultra-short-length and simple structure. We have researched the effects of DC-PCF structure parameters on performances of the splitter by finite element method. The results show that the extinction ratio of the \(92\,\upmu \hbox {m}\)-long splitter can reach \(-53.2\) dB at the communication wavelength of \(1.55\,\upmu \hbox {m}\). Furthermore, the extinction ratio of the \(139\,\upmu \hbox {m}\)-long splitter can reach \(-57.1\) dB at the communication wavelength of \(1.31\,\upmu \hbox {m}\). The bandwidths of extinction ratio better than \(-20\) dB are about 30 and 20 nm at wavelength of 1.55 and \(1.31\,\upmu \hbox {m}\), respectively.
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