FARADAY ROTATION SINGLE-MODE FIBER

• Main Authors: TAJIMA HIDEMI, MASUDA ISAO, YAMASHITA TOSHIHARU
• Format: Patent
• Language: English
• Published: 08.01.1987
• 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 absorb and remove clad mode light, to make the accurate adjustment of pinholes and the use of matching oil unnecessary and to facilitate handling by adding various wave absorbers to a base glass contg. a large amount of lead. CONSTITUTION:When a single-mode fiber having a core-clad-jacket three-layered structure is produced, the jacket layer is made of glass obtd. by adding absorbers absorbing wave from a light source used to glass having a composition consisting of, by weight, 5-28% SiO2, 0-10% B2O3, 0-5% Al2O3 (SiO2+B2 O+Al2O3=16-28%), 0.3-2.5 Na2O+K2O and 69.5-83.7% PbO. The core and clad are made of glass having said composition. The wave absorbers include Co2O3, Cr2O3, CuO, NiO, Fe2O3 and V2O5.