SINGLE MODE OPTICAL FIBER HAVING FARADAY ROTATION EFFECT

• Main Authors: TAJIMA HIDEMI, MASUDA ISAO, YAMASHITA TOSHIHARU
• Format: Patent
• Language: English
• Published: 14.07.1987
• 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

PURPOSE:To obtain the titled fiber having high Verdet's constant which can be formed to fiber without causing devitrification by using core glass and clad glass consisting of glass having limited compsn. of the components, particularly such glass contg. a specified amt. of SiO2, B2O3, Al2O3, and Tb2O3. CONSTITUTION:The single mode optical fiber having Faraday rotation effect is constituted of core glass and clad glass consisting of 26-38mol% SiO2, 18-34mol% B2O3, 17-26mol% Al2O3, 18-32mol% Tb2O3, 0-5mol% ZrO2, 0-5mol% Ce2O3, 0-5mol% Pr2O3, 0-5mol Dy2O3, and 0-5mol% Ho2O3 (wherein the sum of Ce2O3+Pr2O3+Dy2O3+Ho2O3=0-5mol%), and the sum of the above described components is >=97mol%. It is preferred that Tb2O3+Ce2 O3+Pr2O3+Dy2O3+Ho2O$d3 is >20 from the viewpoint for obtd. increased Verdet's constant.