Prism-coupling through the microstructured cladding is used to selectively excite individual higher order modes in hollow-core photonic crystal fibers (PCFs). Mode selection is achieved by varying the angle between the incoming beam and the fiber axis, in order to match the axial wavevector component to that of the desired mode. The technique allows accurate measurement of the effective indices and transmission losses of modes of arbitrary order, even those with highly complex transverse field distributions that would be extremely difficult to excite by conventional endfire coupling.
© 2014 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: April 17, 2014
Manuscript Accepted: May 7, 2014
Published: June 18, 2014
Barbara M. Trabold, David Novoa, Amir Abdolvand, and Philip St.J. Russell, "Selective excitation of higher order modes in hollow-core PCF via prism-coupling," Opt. Lett. 39, 3736-3739 (2014)
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