Bend insensitive gradient index multi-mode light conducting fiber

US8805145B2 · kind B2 · utility

Assignee

• J-FIBER GMBH · DE

Inventors

• Wolfgang Hämmerle · Jena, DE
• Harald Hein · Jena, DE
• Christian Genz · Jena, DE
• Lothar Brehm · Jena, DE
• Falk Wirth · Jena, DE

Key dates

• Filing date: Oct 18, 2012
• Grant date: Aug 12, 2014
• Expiry date: Oct 18, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/0288
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The invention relates to a bend insensitive gradient index multimode light conducting fiber comprising a leakage mode dependent optical core diameter that is uniform over its length and numerical aperture that is uniform over its length, a core (1), an inner cladding (2), a refraction index trench (3) and an outer cladding (4), wherein the core (1) includes a core radius R1, an alpha-refraction index profile and a core refraction index difference dn1 with respect to the outer cladding (4), wherein the refraction index trench (3) includes a refraction index trench radius R3 and a trench refraction index difference dn3 with respect to the outer cladding (4), wherein the outer cladding (4) includes an outer cladding radius R4 and a refraction index between 1.40 and 1.55, wherein for a light wavelength of 850 nm and an overfilled launch (OFL), the optical core diameter for a fiber length in a range between 2 m and 300 m decreases by less than 5% and the numerical aperture decreases by less than 2.5% and the curvature related attenuation increase for two turns and a curvature radius of 7.5 mm is less than 0.2 db.