期刊
OPTICS EXPRESS
卷 18, 期 6, 页码 5496-5503出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.18.005496
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资金
- Hong Kong SAR government [PolyU5182/07E]
- Hong Kong Polytechnic University [J-BB9K]
- NSF of China [60629401]
We present a new method for fabricating structural long-period gratings (LPGs) in photonic-crystal fibers (PCFs). The method is based on periodically drilling holes into the PCF cladding along the length of the fiber by use of a focused femtosecond infrared laser. A very short LPG with only 9 periods and a grating length of < 4 mm exhibited resonance strength of over 20 dB and a polarization dependent loss of 25 dB. The high resonance strength is attributed to the strong modulated mode-field profile caused by the significant perturbation of the fiber geometry. The mechanism of LPG formation is discussed based on coupled local-mode theory. (C) 2010 Optical Society of America
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