Abstract:
An optical fiber with a graded index crystalline core (2,3) is made by filling a tube (1) with a mixture of two salts for which the one with the higher melting point has the lower refractive index. A graded composition results from partition effects when the fused salts are slowly cooled so that solidification proceeds uniformly inwardly from the tube wall. Fiber is pulled conventionally from the reesulting preform, and later is passed through a short hot zone to convert the core into single crystal form.
Abstract:
PURPOSE:To ensure the adhesive properties and the smoothness of interface for the core and cladding, by forming the cladding of ion crystal by using an extruder having a crosshead die for a core fiber which is previously formed with the ion crystal. CONSTITUTION:A core fiber 1 of ion crystal is led into a pierced hole 5 of a mandrel 4 provided at the center part of a crosshead die 3 of an extruder 2. At the same time, the ion crystal powder 7 which is turned into a cladding is filled into a barrel 6. The powder 7 is pressed by a ram 9 heated by a heater 8 up to a temperature lower than the melting point to be plasticized, flows into the die 3 through the tip of the barrel 6, sticks to the outside of the fiber 1 which is led through the hole 5 at a lip part 10 to form a cladding 11. In this case, an end of the mandrel 4 is connected to a vacuum pump 14 through a pipe 13 to reduce the pressure within the mandrel 4.
Abstract:
PURPOSE:To prevent a breaking incident and to inhibit the pollution, oxidation, heat absorption, damage, etc. of a linear body by putting a metallic halide in a glass pipe and heating and drawing them. CONSTITUTION:The lower end of a low m.p. glass pipe 19 such as a lead glass pipe is formed into a circularly curved face, the upper end is kept open, and a metallic halide 20 such as TlBr, AgBr or AgBr+AgCl is put in the pipe 19. This pipe 19 is suspended in a frame 1 with holders 5, 6, and after evacuating the pipe 19 to a prescribed vacuum degree with a vacuum device 16, and inert gas is fed from a gas feeder 17. The lower end of the pipe 19 is then heated with a heating furnace 7 to melt the metallic halide 20 as well as to soften the glass, and by coiling the lower end of the pipe 19 with a coiler 18, a linear body 22 provided with a glass sheath is obtd.
Abstract:
Apparatus (10) is provided for drawing a self-aligned core fiber (34) free of surface contamination and inserting the core fiber (34) into a cladding material (33) to make an optical fiber preform. Single or multi-mode optical fibers having high quality core-clad interfaces can be directly drawn from the preforms described herein.
Abstract:
Disclosed is an optical fiber comprising a silver halide solid solution of the formula AgCl x Br 1-x , wherein x ranges from 0 to 1.0, and one or more dopants selected from the group consisting of AgI and those of the formula MY, wherein M may be Li, Na, K, Rb, Cs; or MY 2 , wherein M may be Mg, Ca, Sr, Ba, Cd, Pb or Hg, and Y may be Cl, Br or I.
Abstract translation:公开了一种光纤,其包含式AgCl x Br 1-x的卤化银固溶体,其中x为0至1.0,以及一种或多种选自AgI和式MY的掺杂剂,其中M可以是Li ,Na,K,Rb,Cs; 或MY2,其中M可以是Mg,Ca,Sr,Ba,Cd,Pb或Hg,Y可以是Cl,Br或I.