The Transmission Characteristics Of Terahertz Wave Of The Plastic Crystal Fiber

Along with the terahertz (THz) wave technology of the rapid developmentand wide application, the design of transmission medium is becoming more andmore necessitous. Nearly10years, transmission medium has become theresearch key object for terahertz wave. Crystal fiber (PCF) has become an idealtransfer medium for THz waves because of its super smooth dispersion and lowloss transmission. Plastic light photonic crystal fiber (PPCF) with goodflexibility and low melting temperature will become the choice of transmissionmedium for THz waves.Present situation of research on THz technique and PCF are summarized indetail. Four kinds of commonly used method of computer simulation of opticalwaveguide the plane wave method (PWM), the beam propagation method(BPM), finite difference frequency domain (FDFD) method are introduced inpaper. The dispersion, the leakage loss, the mode field distribution and the bandgap characteristics are Analyzed for band gap photonic crystal fiber (PBG-PCF)and total internal reflection photonic crystal fiber (TIR-PCF) in THz wave bandtransmission.New structure photonic crystal optical fiber with high refractive index column isdesigned and analyzed for THz wave transmission. Calculation result show thatthe dispersion change is0.1ps/(km nm), minimum loss value is0.9dB/km forTHz wave within the wavelength of60-65um (4.6-5THz) at the ratio of air holediameter (d) to lattice constants () being equal to0.75. Designed photoniccrystal fiber with high refractive index column can achieve large capacity forlong distance transmission.