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Design and optimization of mechanically down-doped terahertz fiber directional couplers
Author(s) -
Hualong Bao,
Kristian Nielsen,
Henrik Koblitz Rasmussen,
Peter Uhd Jepsen,
Ole Bang
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.009486
Subject(s) - terahertz radiation , optics , photonic crystal fiber , materials science , power dividers and directional couplers , bandwidth (computing) , cladding (metalworking) , figure of merit , broadband , optoelectronics , optical fiber , physics , telecommunications , computer science , metallurgy
We present a thorough practical design optimization of broadband low loss, terahertz (THz) photonic crystal fiber directional couplers in which the two cores are mechanically down-doped with a triangular array of air holes. A figure of merit taking both the 3-dB bandwidth and loss of the coupler into account, is used for optimization of the structure parameters, given by the diameter and pitch of the cladding (d and Λ) and of the core (d(c) and Λc) air-hole structure. The coupler with Λ = 498.7 µm, d = 324.2 µm, Λc = 74.8 µm, and d(c) = 32.5 µm is found to have the best performance at a center frequency of 1THz, with a bandwidth of 0.25 THz and a total device loss of 9.2 dB. The robustness of the optimum coupler to structural changes is investigated.

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