期刊
IEEE PHOTONICS TECHNOLOGY LETTERS
卷 20, 期 1-4, 页码 132-134出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2007.912531
关键词
birefringence; CO2 laser; long-period fiber grating (LPFG); optical filter; photonic-crystal (PC) fiber; polarization-maintaining (PM) fiber
We report the writing of long-period gratings in conventional and photonic-crystal (PC) polarization-maintaining (PM) fibers by high-frequency CO2-laser pulses. We find that the writing efficiency depends on the irradiation direction of the writing beam with respect to the principal axes of the fiber, with the highest efficiency obtained when the irradiation direction is along the slow axis of the fiber. Such orientation dependence is much stronger for a conventional PM fiber than for a PC PM fiber. Using a conventional PM fiber, we demonstrate a grating that shows two clean polarization-splitting rejection bands with a separation of 33.4 nm and a contrast higher than 30 dB.
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