Faraday rotation single-mode optical fiber

• Main Authors: YAMASHITA; TOSHIHARU, MASUDA; ISAO, TAJIMA; HIDEMI
• Format: Patent
• Language: English
• Published: 23.02.1988
• Edition: 4
• Subjects: CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; METALLURGY; MINERAL OR SLAG WOOL; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

A Faraday rotation single-mode fiber having a high Verdet constant is disclosed, the core and the cladding of the fiber being made of a glass having the following composition: 26 to 38 mol % SiO2, 18 to 34 mol % B2O3, 17 to 26 mol % Al2O3, 18 to 32 mol % Tb2O3, 0 to 5 mol % ZrO2, 0 to 5 mol % Ce2O3, 0 to 5 mol % Pr2O3, 0 to 5 mol % Dy2O3 and 0 to 5 mol % Ho2O3, provided that the total amount of the above ingredients is not less than 97 mol % and the total amount of Ce2O3, Pr2O3, Dy2O3 and Ho2O3 is 0 to 5 mol %.