Journal article
Design and optimization of mechanically down-doped terahertz fiber directional couplers
Department of Photonics Engineering, Technical University of Denmark1
Fiber Sensors & Supercontinuum, Department of Photonics Engineering, Technical University of Denmark2
Fibers & Nonlinear Optics, Department of Photonics Engineering, Technical University of Denmark3
Department of Mechanical Engineering, Technical University of Denmark4
Manufacturing Engineering, Department of Mechanical Engineering, Technical University of Denmark5
Teraherts Technologies and Biophotonics, Department of Photonics Engineering, Technical University of Denmark6
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 (dc and Λc) air-hole structure.
The coupler with Λ = 498.7 μm, dc= 324.2 μm, Λc = 74.8 μm, and dc = 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. © 2014 Optical Society of America.
| Language: | English |
|---|---|
| Publisher: | The Optical Society |
| Year: | 2014 |
| Pages: | 9486-9497 |
| ISSN: | 10944087 |
| Types: | Journal article |
| DOI: | 10.1364/oe.22.009486 |
| ORCIDs: | Rasmussen, Henrik K. , Jepsen, Peter Uhd and Bang, Ole |
