Abstract
A novel design for a broadband directional coupler based on a photonic crystal fiber is investigated numerically. It is shown that suitable index-depressing doping of the core regions in an index-guiding twin-core photonic crystal fiber can stabilize the coupling coefficient between the cores over an extremely broad (octave-spanning) frequency range.
| Original language | English |
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| Journal | Optics Letters |
| Volume | 29 |
| Issue number | 21 |
| Pages (from-to) | 2473-2475 |
| ISSN | 1094-4087 |
| Publication status | Published - 2004 |