Multi-core optical fiber and design method
US12181707B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 2020 |
| Grant date | Dec 31, 2024 |
| Priority date | — |
| Expiry date | Aug 12, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0012
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention is to provide a multi-core optical fiber that can expand its transmission wavelength band, and extend its transmission distance by reducing crosstalk, and also provide a method for designing the multi-core optical fiber. A multi-core optical fiber according to the present invention includes: four cores that are arranged in a square lattice pattern in a longitudinal direction; and a cladding region that is formed around the outer peripheral portions of the cores and has a lower refractive index than the cores, the absolute value of the relative refractive index difference between the cores and the cladding region being represented by A. In the multi-core optical fiber, the diameter of the cladding region is 125+1 μm, the cutoff wavelength is 1.45 μm or shorter, the mode field diameter MFD at a wavelength of 1.55 μm is 9.5 to 10.0 μm, the bending loss at a wavelength of 1.625 μm and with a bending radius of 30 mm is 0.1 dB/100 turns or smaller, and the inter-core crosstalk at the wavelength of 1.625 μm is −47 dB/km or smaller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.