Temperature-controlled and multi-functional splitter based on dual-core photonic crystal fiber

A temperature-controlled dual-core photonic crystal fiber splitter having multiple coupling characteristics is designed through infiltrating a mixture of toluene and chloroform into the twin-core holes. Multiple splitting functions are integrated in the same PCF structure with a fixed length. The incident light within the range of 1.30-1.70 mu m can be divided into two polarized components in orthogonal directions. The maximum bandwidth and extinction ratio can reach 255 nm and -68 dB when the external temperature varies from 10 degrees C to 27 degrees C. Especially, the polarized light waves in one core can shift from previous y-polarization to x-polarization at certain higher temperatures or vice versa. Meanwhile, the proposed splitter can realize the wavelength splitting of 1.30 mu m/1.49 mu m, 1.30 mu m/1.55 mu m, 0.85 mu m/1.55 mu m and 1.49 mu m/1.63 mu m through manipulating the operating temperature. The PCF-based splitter has simpler structure and better performance, and has great potential applications in the field of integrated optoelectronics.