Active optical fiber and preparation method thereof
An optical fiber and fiber core technology, applied in the field of active optical fiber and its preparation, can solve the problems of large splicing loss and low absorption coefficient, and achieve the effects of reducing splicing loss, improving preparation accuracy, and improving cladding pumping absorption
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[0064] According to another aspect of the present invention, the present invention also relates to the preparation method of the active optical fiber, comprising the following steps:
[0065] depositing rare earth elements on the inner surface of the first quartz tube, and sintering to form a core rod;
[0066] Depositing fluorine and / or phosphorus on the inner surface of the second quartz tube to form an annular region layer; depositing a silicon dioxide layer on the surface of the annular region layer to form an inner cladding sleeve;
[0067] Inserting the core rod into the inner cladding sleeve to form an assembly, subjecting the assembly to heat treatment to obtain a preform; after drawing the preform, an inner coating and an outer coating are sequentially applied.
[0068] The invention can effectively adjust the width of the annular region by separately preparing the core rod and the sleeve with the annular region of low refractive index, thereby meeting the design requ...
Embodiment 1
[0080] like figure 1 , an active optical fiber provided in this embodiment includes a core 101 , an inner cladding 102 , an inner coating 104 and an outer coating 105 . The core 101 is a circular structure, the core 101 is made of silicon dioxide, the doping element includes ytterbium, and the refractive index of the core 101 is n 1 ; The inner cladding layer 102 is a circular structure, the composition is silicon dioxide, and the refractive index is n 2 ; The inner cladding layer 102 sequentially includes a first silicon dioxide matrix layer, an annular region layer 103 and a second silicon dioxide matrix layer from inside to outside, and the annular region layer 103 is based on silicon dioxide, and the doping element is fluorine, The refractive index of the annular region layer 103 is n 3 ; The inner coating layer 104 is a low refractive index polymer with a refractive index of n 4 , the outer coating 105 is a high-refractive-index polymer, and the refractive index is n ...
Embodiment 2
[0083] like Figure 5 As shown, this embodiment provides a method for preparing an active optical fiber.
[0084] Step 1: Use MCVD, PCVD and other processes to prepare an active optical fiber core rod: use a high-purity quartz tube as a reaction tube, deposit ytterbium element at high temperature, melt and sinter, and the sintering temperature is 1950 ° C to form an active optical fiber core rod; The core rod comprises a rare earth element-doped core layer and a cladding layer composed of silica;
[0085] Step 2: Select an appropriate quartz tube as the reaction tube according to the core-to-pack ratio of the active fiber and the size of the low-refractive-index annular region, and place it on the MCVD and PCVD lathes; at high temperature, first deposit fluorine to form a low-refractive index annular area; then deposit a silica layer on the annular area of low refractive index to form a sleeve; in order to improve the accuracy of the subsequent sleeve rod, the difference be...
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