Analysis of the characteristics of the polarization splitter based on tellurite glass dual-core photonic crystal fiber

A novel kind of polarization splitter based on tellurite glass dual-core photonic crystal fiber is proposed. The characteristics of the polarization splitter have been studied by the finite element method. By adjusting the ellipticity of the dual-core PCF, a very high value of birefringence can be reached. The high birefringence can increase the D-value of coupling length in the two orthogonal polarization directions, then the polarization-independent splitter can be achieved. Comparing with the SF57 glass dual-core PCF, the tellurite glass dual-core PCF has higher extinction ratio, the extinction ratio can reach −31 dB at the wavelength λ=1.55μm. The 0.36-mm-long splitter is proposed to achieve extinction ratio better than −10 dB and a bandwidth of 20 nm.

► We analyze the impact of air-hole ellipticity on the polarization splitter.
► When the ellipticity e  =1, the birefringence can be reach 0.046538 at λ=1.55μm.
► Compared with the SF57 glass PCF, the tellurite PCF have higher extinction ratio.
► The 0.36-mm-long splitter achieve extinction ratio better than −10 dB and a bandwidth of 20 nm.