Journal
OPTICS COMMUNICATIONS
Volume 271, Issue 2, Pages 391-395Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2006.10.039
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We report the fabrication and characterization of the first bitapers in air-core photonic bandgap fibers. Like conventional fiber bitapers, these devices are found to exhibit quasi-sinusoidally modulated transmission spectra, the signature of resonant coupling to a dominant cladding mode. However, unlike in conventional tapers of comparable length, the modulation period is very short (0.5-3.3 nm), which suggests that coupling takes place to a very high order cladding mode. Such coupling is observed even in comparatively weak bitapers (diameter reduction as low as similar to 2%), indicating that air-core fibers are highly sensitive to tapering. The loss of weak tapers is observed to be small (< 0.3 dB), which suggests possible applications of this simple technology as in-line filters of high resolution. (c) 2006 Elsevier B.V. All rights reserved.
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