Journal
OPTICS LETTERS
Volume 34, Issue 11, Pages 1726-1728Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.34.001726
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Funding
- Research Grants Council of the Hong Kong SAR, China [CityU 111907]
- Shanghai Education Commission, China [08SG40]
- Program for Eastern Scholars at the Shanghai Institutions of Higher Learning
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We experimentally demonstrate the contradirectional optical coupling between two parallel fibers that contain a long-period fiber grating and a tilted fiber Bragg grating, respectively. Strong coupling occurs between the cladding modes of the same order over the overlapped resonance bands of the two gratings. By optimizing the coupling conditions, we achieve a peak coupling efficiency of similar to 80% at similar to 1534 nm with a 3 dB bandwidth of similar to 0.12 nm and a side-mode suppression ratio of similar to 16 dB, regardless of which fiber light is launched into. This coupler configuration can be explored for the development of narrow-band all-fiber optical components. (C) 2009 Optical Society of America
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