太赫兹双芯光子带隙光纤定向耦合器

白晋军; 王昌辉; 侯宇; 范飞; 常胜江

太赫兹双芯光子带隙光纤定向耦合器

天津工业大学电子与信息工程学院,天津,300387

南开大学现代光学研究所,天津,300071

Terahertz dual-core photonic band-gap fiber directional coupler

摘要: 提出了一种低损耗、宽频段太赫兹双芯光子带隙光纤定向耦合器，光纤的包层由亚波长尺度呈三角晶格排列的空气孔组成，两个纤芯分别由去掉7个空气孔构成．利用全矢量有限元法对光纤的色散、耦合特性以及损耗特性进行了理论分析．研究表明，这种耦合器的损耗系数小于0．021cm^-1更重要的是可以实现0．14THz范围内的宽频定向耦合．这种定向耦合器在太赫兹通信系统中滤波、波分复用、偏振分离和开关等技术中有潜在的应用价值．

关键词:

Abstract: A low-loss and broadband terahertz twin-core photonic band-gap fiber directional coupler is proposed, which consists of a cladding with a triangular lattice array of sub-wavelength air rods and two cores formed respectively by omitting seven nearby air rods. The group veIocity dispersion, the coupling and the loss of the fibers are investigated by using a full-vector finite element method. The numerical simulations show that the loss coefficient of the coupler is less than 0.021 cm^-1, and the coupling broadband of 0.14 THz can be realized. The directional coupler has potential applications in terahertz communication systems, such as filtering, wavelength-division multiplexing, polarization isolation, switching and so on.

太赫兹双芯光子带隙光纤定向耦合器

天津工业大学电子与信息工程学院,天津,300387

南开大学现代光学研究所,天津,300071

关键词:

Terahertz dual-core photonic band-gap fiber directional coupler

天津工业大学电子与信息工程学院,天津,300387

南开大学现代光学研究所,天津,300071

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