Open AccessTerahertz dual-core photonic band-gap fiber directional coupler
Author(s) -
Bai Jin-Jun,
Changhui Wang,
Hou Yu,
Fei Fan,
Shengjiang Chang
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.108701
Subject(s) - terahertz radiation , power dividers and directional couplers , broadband , cladding (metalworking) , materials science , optics , wavelength , rod , photonics , optoelectronics , physics , medicine , alternative medicine , pathology , metallurgy
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 velocity 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.