Samenvatting
An optical fiber for refractometry of a fluid surrounding the fiber and refractive index sensing method are disclosed. The optical fiber (10, 20) comprises a solid core portion (11) and a cladding portion (12) surrounding the core portion. A tilt-free Bragg grating (14, 24a) is formed in the core portion and configured to couple light of a core-guided mode to at least one higher-order cladding mode. A cross-section of the cladding portion is microstructured through an arrangement of holes (13) such that an effective refractive index associated with one of said higher-order cladding modes varies as a function of the surrounding fluid refractive index and is inferior to 1,35.
| Originele taal-2 | English |
|---|---|
| Octrooinummer | WO2022069687 |
| Status | Published - 2022 |