Journal
OPTICS LETTERS
Volume 35, Issue 5, Pages 769-771Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.35.000769
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- Hong Kong Special Administrative Region, China [CityU 111907]
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We propose a microwave photonic filter based on circulating a cladding mode in a fiber ring resonator, where the cladding mode is injected into and extracted from the resonator with a pair of matching long-period fiber gratings (LPFGs). The filter has a compact configuration and allows the frequency spacing and the notch depth to be tuned easily. The use of LPFGs also provides the capability of wavelength selection and tuning. Using a standard single-mode fiber and a pair of CO2 laser-written LPFGs, we demonstrate a filter with a frequency spacing of similar to 1.3 GHz and a notch depth of similar to 17 dB. Our experimental results agree well with theoretical calculations. (C) 2010 Optical Society of America
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