Broadband Terahertz Wave Polarization-Maintaining Transmission Fiber

Abstract

The broadband terahertz wave polarization-maintaining transmission fiber of the present invention adds elliptical air holes or rhombic air holes into the fiber cladding, so that the mode field distributions of the two modes of TE and TM are different in a wide spectrum range, thus having different effective The refractive index produces high birefringence. At the same time, two rows of circular air holes are introduced in the center of the fiber to change the symmetry of the structure, improve the birefringence of the fiber, and adjust the dispersion of the fiber to achieve a broadband low-dispersion polarization-maintaining terahertz photonic crystal. Optical fiber, photonic crystal fiber birefringence value can reach 10-3, or even 10-2, which is at least an order of magnitude higher than traditional polarization-maintaining fiber, and has very low dispersion and flat dispersion curve in a wide spectrum range, for broadband Distortion-free transmission of terahertz pulses is very important. In addition, the structure of the fiber can be changed by adjusting the parameters of the air holes on the cross-section of the photonic crystal fiber, so as to obtain the adjustment of the dispersion.

Description

technical field [0001] The invention belongs to optical terahertz transmission technology, in particular to an optical fiber which is preferentially used as an optical transmission path in a terahertz wave transmission and communication system. Background technique [0002] Terahertz waves are located between microwaves and far-infrared waves in the (electromagnetic spectrum) electromagnetic spectrum. The molecular rotation and vibration levels of many objects are in the terahertz spectrum range, so terahertz spectroscopy can be used as an important means of material characterization and fingerprint identification. In addition, terahertz waves have moderate beam width, wide spectral bandwidth and large Doppler shift, so they have important application value in broadband wireless communication, space communication and fine imaging, and will become the next generation of high-speed wireless communication. important means. The advantages of high-resolution imaging and high pen...

Images