We have investigated the validity of the V parameter to identify the single-mode operation regime for photonic quasi-crystal fibers. Our results show that the V parameter can be considered only for smoothly changing fibers. On the other hand, for fibers showing isolated high refractive regions around the core, only a mode area analysis can allow the estimation of the threshold for the single-mode operation regime. Finally, these findings can be generalized to any kind of optical fiber.
© 2010 Optical Society of America
Diffraction and Gratings
Original Manuscript: November 19, 2009
Revised Manuscript: February 5, 2010
Manuscript Accepted: February 14, 2010
Published: March 31, 2010
Han Zhao, Remo Proietti Zaccaria, Prabhat Verma, Junfeng Song, and HongBo Sun, "Validity of the V parameter for photonic quasi-crystal fibers," Opt. Lett. 35, 1064-1066 (2010)