Photonic crystal fiber directional coupler
A photonic crystal fiber, directional coupler technology, applied in the coupling of optical waveguides, cladding fibers, optical waveguides and other directions, can solve difficulties and other problems, and achieve the effects of mature production technology, stable performance and low polarization-related loss.
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[0020] Its cross-section is as figure 1 As shown, the structural matrix material is quartz, the pore period Λ is 10 μm, the diameter of the first air hole 2 is 4.2 μm, and the diameter of the second air hole 3 is 4.8 μm. When the wavelength λ=1.55 μm, the coupling length of the x-polarization is calculated to be 20.4 cm, and the coupling length of the y-polarization is 21.4 cm. Take the average value (20.9 cm) of the coupling length of the two polarization directions as the length of the fiber coupler, and thus obtain the curve of the bandwidth of the coupler changing with the wavelength as follows: Figure 4 shown. It can be seen from the figure that when the insertion loss is within the range of 4.77±0.3 dB and the polarization-dependent loss is within the range of ±0.2 dB, its bandwidth is 127 nm.
[0021] Compared with the phase, the cross-section is taken as Figure 5 As shown, the structural matrix material is quartz, the pore period Λ is 10 μm, and the diame...
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