Search

We theoretically designed a dual function of nearly zero dispersion flattened and polarization maintaining photonic crystal fiber (DF–PM-PCF) with ultra-broadband. The numeric results show that the DF–PM-PCF performs the nearly zero dispersion values between − 1.00 and − 0.12 ps/km/nm over a bandwidth range of 482 nm (1218–1700 nm). The operation band expands from O band (1260–1360 nm) to U band (1625–1675 nm). In the meanwhile, the birefringence values of the proposed DF–PM-PCF were estimated and show that they are 0.93 × 10−3–1.25 × 10−3 in the operation band. Confinement losses of some wavelengths in the operation band were calculated and confirmed that they are reasonable. The numeric results indicate that the DF–PM-PCF has confinement losses of 2.75 × 10−3–3.39 × 10−1 dB/km in the operation band. Furthermore, the mode properties of the proposed DF–PM-PCF were simulated and confirmed that it works in single mode in the operation band. The device can be well used in a WDM communication system.

This article tailored the dispersion and increased the birefringence in a photonic crystal fiber (PCF), and then designed a dual function of dispersion flattened / polarization maintaining PCF (DF-PM-PCF). The numeric results indicate that the DF-PM-PCF achieves the dispersions within a window of 0±1.0 ps/nm/km over a bandwidth range of 679 nm(1235 nm∼ 1914 nm). In the meanwhile, the birefringence values of the DF-PM-PCF were estimated and shown that they are larger than 0.30 × 10−3 in the operating band. Furthermore, the confinement losses of the device are calculated and confirmed that they are reasonable. The numeric results indicate that the DF-PM-PCF has confinement losses of 5.5×10−4 dB/km to 1.4×10−2 dB/km in the operating band.