Patent ID: 9522838
Filing Date: 2016-12-20
CPC Classification: C03B,C03C

Claim Text:
1. A system for producing a depressed-cladding core rod of an ultra-low water peak optical fiber, the system comprising: a core rod component comprising a core layer rod and a core rod hollow shaft, said core rod hollow shaft comprising a first core rod hollow shaft end, a second core rod hollow shaft end, and a plurality of vents; an inner cladding casing component comprising an inner cladding casing and a casing hollow shaft, and said casing hollow shaft comprising a first casing hollow shaft end and a second casing hollow shaft end; a high temperature heat source; a glass lathe having two chucks; a rotary joint; an external gas pipe; a pressure controlling pipe; a scrubber; and a vacuum pump; wherein: said first core rod hollow shaft end is fused and sliced onto said core layer rod; said plurality of vents is arranged at said first core rod hollow shaft end; said first casing hollow shaft end is fused and sliced onto said inner cladding casing; said core layer rod is inserted into said inner cladding casing and a gap is formed between said inner cladding casing and said core layer rod; said second core rod hollow shaft end and said second casing hollow shaft end are disposed in said two chucks, respectively; said second core rod hollow shaft end is connected to said external gas pipe via said rotary connector for transporting gases through said external gas pipe to said core rod hollow shaft; one end of said pressure controlling pipe is connected to said external gas pipe and the other end of said pressure controlling pipe is connected to said scrubber; said vacuum pump is connected to said pressure controlling pipe; said second casing hollow shaft end is connected to said scrubber for exhausting gases and controlling pressure within said gap; said inner cladding casing is connected to said first core rod hollow shaft end hermetically and said plurality of vents is enclosed by said inner cladding casing, whereby said external gas pipe is connected to said gap via said plurality of vents; and said high temperature heat source is arranged outside said inner cladding casing for fusing said inner cladding casing onto said core layer rod to form the depressed-cladding core rod.