Journal
OPTICS EXPRESS
Volume 17, Issue 19, Pages 16750-16755Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.17.016750
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Funding
- Natural Science Foundation of China [60807019]
- NCET [NCET-08-0602]
- Natural Science Foundation [CSTC2008BB2165]
- University of Electronic Science and Technology of China
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We propose an all-fiber band-rejection filter with a tunable bandwidth, which is realized by putting a normal long-period fiber grating in series with a rotary long-period fiber grating written in a twisted single-mode fiber by CO2 laser pulses. Bandwidth tuning is achieved by applying torsion to the composite grating. Our experimental filter shows a bandwidth tuning of similar to 16.3 nm at a rejection level of similar to 15 dB and a polarization-dependent loss lower than similar to 0.9 dB. (C) 2009 Optical Society of America
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