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Bi/Al co-doped silica fiber and preparation method thereof

A quartz fiber and quartz technology, applied in the field of Bi/Al co-doped silica fiber and its preparation, can solve the problems of hindering and limiting the number of communication fiber channels, and achieve the effect of low price, good uniformity and simple structure

Active Publication Date: 2016-04-06
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the gain bandwidth of the erbium-doped fiber amplifier is only 35nm, which only covers a very small part of the low-loss transmission window of the quartz single-mode fiber, which seriously hinders and limits the number of channels that the communication fiber inherently accommodates wavelengths.

Method used

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  • Bi/Al co-doped silica fiber and preparation method thereof
  • Bi/Al co-doped silica fiber and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] see figure 1 , a Bi / Al co-doped silica fiber, comprising a core 1 and a cladding 2, the core 1 comprising an outer silica loose layer and a Bi / Al co-doped semiconductor material with a certain concentration uniformly distributed in the middle, the said The core 1 is located in the middle of the cladding 2 . The quartz loose layer is pure quartz or doped with a small amount of GeO with high refractive index 2 of quartz material. The cladding 2 is made of pure silica with a lower refractive index than the core 1 . The valence state of bismuth ions doped with bismuth in the core 1 is Bi 0 , Bi + , Bi 2+ , Bi 3+ with Bi 5+ , or coexistence between different valence states. The diameter range of the fiber core 1 is d core =Φ5μm, cladding 2 bare fiber diameter range is d cladding =Φ125μm, the refractive index difference between core 1 and cladding 2 is 0.3%.

[0030] The absorption peaks of the fiber are 500nm, 700nm, 800nm ​​and 1000nm respectively; the pump wavel...

Embodiment 2

[0032] see figure 1 , a Bi / Al co-doped silica fiber, comprising a core 1 and a cladding 2, the core 1 comprising an outer silica loose layer and a Bi / Al co-doped semiconductor material with a certain concentration uniformly distributed in the middle, the said The core 1 is located in the middle of the cladding 2 . The quartz loose layer is pure quartz or doped with a small amount of GeO with high refractive index 2 of quartz material. The cladding 2 is made of pure silica with a lower refractive index than the core 1 . The core 1 is doped with bismuth ions. The diameter range of the fiber core 1 is d core =Φ15μm, cladding 2 bare fiber diameter range is d cladding =Φ130μm, the refractive index difference between core 1 and cladding 2 is 0.8%.

[0033] The absorption peaks of the fiber are 500nm, 700m, 800nm ​​and 1000nm respectively; the pump wavelength is 800nm, the fluorescence spectrum is in the range of 1150-1650nm; the gain spectrum is in the range of 1200-1600nm.

Embodiment 3

[0035] see figure 2 , a preparation method of Bi / Al co-doped silica optical fiber, which is prepared by atomic layer deposition, that is, ALD combined with improved chemical vapor deposition, that is, MCVD. The steps are as follows: first, on the inner wall of the cladding layer 2, SiO 2 and GeO 2The core layer material forms a translucent loose porous layer; secondly, ALD deposition technology is used to deposit SiO 2 and GeO 2 Bismuth oxide and aluminum oxide nanoparticles are deposited on the inner surface of the loose layer. Bismuth oxide nanoparticles were deposited for 100 cycles, followed by aluminum oxide for 150 cycles. Trimethylaluminum Al(CH 3 ) 3 ,Bi(thd) 3 and O 3 It is the precursor source material of alumina and bismuth oxide. Heat source Bi(tmhd) 2 The temperature is controlled at 100°C, the entire reaction chamber is heated by radiation, and the temperature is uniform, controlled at 250°C, the Bi source pulse time is 200ms, and the purge time is 0.5s...

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Abstract

The invention relates to a Bi / Al co-doped silica fiber based on atomic layer deposition (ALD) technology and a preparation method thereof. The Bi / Al co-doped silica fiber comprises a fiber core and a cladding, and is characterized in that the fiber core comprises Bi / Al / Ge co-doped quartz material, and the cladding is made of a pure quartz material. A silica loosening layer doped with GeO2 is deposited in a quartz tube and the layer is semi-vitrified by using an improved method of chemical vapor deposition method (MCVD); then, an ALD technology is utilized to deposit bismuth oxide and a Al2O3 material on the inner wall of the tube; finally, conducting high temperature rod-shrinking processing by using MCVD, a prefabricated rod doped with fiber is obtained; and wire drawing is conducted to the fiber. The silica fiber in the invention has a simple and reasonable structure; the doped material has the advantages of uniform dispersibility, controllable concentration, high fiber luminescence efficiency, and wide gain spectrum; the silica fiber can be applied in occasions like a fiber laser, a fiber amplifier, a broadband light source and a fiber sensor.

Description

technical field [0001] The invention relates to a Bi / Al co-doped silica optical fiber and a preparation method thereof, belonging to the technical field of optical fiber preparation. Background technique [0002] Due to the rapid development of communication systems, the 1.55μm communication window can no longer meet the needs of long-distance and large-capacity communication, and all-optical networks and optical communication are imperative. At present, optical fiber amplifiers doped with rare earth elements, such as erbium, thulium, and ytterbium, have the characteristics of wide bandwidth and high gain, and the broadband fluorescent light source produced by optical fibers doped with rare earth elements (neodymium, praseodymium, thulium, and erbium) has a stable output spectrum. , less affected by the environment, and high output power have always been the focus of research. Among all rare earth-doped quartz amplifying fibers, only erbium-doped fibers have basically been c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02
CPCC03B37/014C03B37/018G02B6/0229
Inventor 文建湘王廷云董艳华刘文君庞拂飞陈振宜郭强
Owner SHANGHAI UNIV