Coupling between the lowest-loss TE01 modes of two touching hollow-core Bragg fibers is considered with a view to designing a directional coupler. We have found that for fibers with core radii larger than 10 mm one can identify broad frequency ranges in which intermodal coupling strength exceeds supermode radiation losses by an order of magnitude, thus opening the possibility of building a directional coupler. We attribute such unusually strong intermode coupling both to the resonant effects in the intermirror cavity and a proximity interaction between the leaky modes localized in the mirror.
© 2004 Optical Society of America
(120.3890) Instrumentation, measurement, and metrology : Medical optics instrumentation
(140.3540) Lasers and laser optics : Lasers, Q-switched
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(170.1790) Medical optics and biotechnology : Confocal microscopy
(170.7170) Medical optics and biotechnology : Ultrasound
Mitsuhiro Terakawa, Makoto Ogura, Shunichi Sato, Hitoshi Wakisaka, Hiroshi Ashida, Maki Uenoyama, Yoshinori Masaki, and Minoru Obara, "Gene transfer into mammalian cells by use of a nanosecond pulsed laser-induced stress wave: erratum," Opt. Lett. 29, 2190-2190 (2004)