Tunable wavelength division multiplexer based on thermal liquid-filled photonic crystal fiber

By filling high refractive thermal liquid (toluene) into the total internal reflection dual-core photonic crystal fiber (DC-PCF), the coupling behaviors of the DC-PCF for different temperature is analyzed by using finite element method, and then a tunable wavelength division multiplexer realized for 980/1550 nm and 1310/1550 nm is obtained at a fixed DC-PCF length of 2475 μm.