Abstract
Photonic crystal fiber (PCF) optical attenuators with air hole diameter control were fabricated by PCF fusion using CO2 laser irradiation technique. The diameters of air holes in the PCF cross-section were equally decreased by laser irradiation with a PCF rotation. We demonstrated that the air hole diameter or the air hole diameter ratio to pitch could be adjusted by the irradiated laser power. It was clarified that the larger attenuation could be obtained for the smaller air hole diameter ratio to pitch. The attenuation was controlled from 5dB to 20dB at 1550nm-wavelength for the air hole diameter ratio to pitch from 0.35 to 0.225, where the length of air hole diameter controlled region was 10mm. It was also clarified that the fabricated PCF optical attenuators exhibited good wavelength independent characteristics for 980nm-, 1310nm-, and 1550nm-wavelengths.
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