Abstract:
A process for manufacturing preforms from which clad optical fibers having longitudinal, eccentric, azimuthal index inhomogeneities may be drawn. In one embodiment, the known CVD process for making preforms is modified by the use of asymmetric heating to produce circumferentially alternating deposits of doped and undoped glass which act as the fiber core when the preform is subsequently collapsed and drawn into a fiber.
Abstract:
A method of producing a glass body composed of two or more oxides by the flame hydrolysis technique, for example incorporating an additive or dopant oxide in a fused silica glass body. The method comprises forming a gas stream containing vapors of a compound that will hydrolyze to a glass forming oxide, e.g., silicon tetrachloride (SiCl4), nebulizing an oxide forming compound or solution of such compound to form a mist in the nature of an aerosol, and simultaneously directing the mist and gas stream into a flame of combustible gas to form and codeposit a mixture of oxides corresponding to the vaporized and nebulized compounds.
Abstract:
A METHOD OF FORMING AN OPTICAL WAVEGUIDE BY FORMING A FIRST COATING OF GLASS HAVING A PREDETERMINED INDEX OF REFRACTION ON THE OUTSIDE PERIPHERAL WALL SURFACE OF A SUBSTANTIALLY CYLINDRICAL STARTER ROD OR MEMBER. THEREAFTER, A SECOND COATING OF GLASS IS APPLIED TO THE PERIPHERAL OUTSIDE SURFACE OF THE FIRST COATING, SAID SECOND COATING HAVING A PRESELECTED INDEX OF REFRACTION LESS THAN THE INDEX OF REFRACTION OF THE FIRST COATING. THE STARTER ROD OR MEMBER IS REMOVED FROM THE ASSEMBLY FOLLOWING THE APPLICATION OF EITHER THE FIRST OR SECOND COATING. THE RESULTING SUBSTANTIALLY CYLINDRICAL HOLLOW ASSEMBLY IS HEATED AND DRAWN TO REDUCE THE CROSS-SECTIONAL AREA AND TO COLLAPSE THE FIRST AND INNER COATING OF GLASS TO FORM A FIBER HAVING A SOLID CROSSSECTIONAL AREA. THE COLLAPSED FIRST AND INNER COATING FORMS THE FIBER CORE AND THE SECOND COATING FORMS THE CLADDING FOR THE FIBER.
Abstract:
A novel camera assembly of the type comprising light receiving photoelectric means and a removable finder is provided. The light receiving means includes compensating means and other parts of a photometric device, all of which are mounted in the finder and removable from the camera. An ammeter and power supply for the light receiving photoelectric means is located in the camera body itself.
Abstract:
Optical transmission lines suitable for transmitting electromagnetic radiation within the visible spectrum and adjoining portions of the infrared and ultraviolet spectra consists of a pure amorphous silica core clad by a B2O3-modified silica cladding. The cladding may manifest a substantial uniform refractive index of a value at least 0.1 percent less than that of the core or may be graded to such a lowered value.
Abstract:
A MOLTEN LAYER OF CLADDING GLASS IS SUPPORTED ON A MOLTEN LAYER OF CORE GLASS AND AN ELONGATED GLASS MEMBER COMPRISING CLADDING ON A CORE IS DRAWN FROM THE FREE SURFACE OF THE UPPER LAYER OF GLASS. THE ELONGATED MEMBER IS COOLED JUST ABOVE THE FREE SURFACE OF THE UPPER LAYER OF MOLTEN GLASS. THE ELONGATED GLASS MEMBER MAY BE DRAWN TO FORM A CLAD FIBER FOR USE IN FIBRE OPTICS. BAIT IS LOWERED TO THE MOLTEN GLASS TO INITIATE DRAWING OF THE ELONGATED GLASS MEMBER.