Method for welding doubly clad optical fiber and photonic crystal fiber
A technology of photonic crystal fiber and double-clad fiber, which is applied in the coupling of optical waveguide, light guide, optics, etc., can solve the problems of high loss, high splicing loss value, mismatched outer diameter, etc., and achieve high-quality, low-loss splicing , low-cost effect
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[0030] such as figure 1 The double-clad optical fiber shown is composed of a protective layer 1 , an outer cladding 2 , an inner cladding layer 3 and a fiber core 4 in order from the outside to the inside. The laser is transmitted in the core 4. The inner cladding 3 covered by the core 4 is made of silica with a refractive index smaller than that of the core 4. The inner cladding 3 is the transmission channel of the pump light, and its diameter is D. 1 ; The outer cladding 2 of the inner cladding layer 3 is composed of a polymer with a smaller refractive index. The mode field diameter of double-clad fibers is generally larger, and the outer diameter is also larger than that of ordinary fibers and photonic crystal fibers. the outer diameter D 1 (that is, the diameter of the inner cladding 3) is 250 μm, the core diameter is 30 μm, and the mode field diameter d 1 26 μm at 1064 nm wavelength.
[0031] such as figure 2 The shown photonic crystal fiber (PCF ...
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