title: Effective way of reducing coupling loss between rectangular microwaveguide and fiber.
abstract: We introduce an anamorphic photonic crystal fiber (PCF) produced by postprocessing techniques to improve the coupling loss between a conventional single-mode fiber and rectangular microwaveguide. One end of the round core is connected with the conventional fiber, and the other end of the rectangular core is connected with the rectangular microwaveguide, then the PCF is tapered pro rata. In this way, the loss of mode mismatch between the output of the conventional fiber and the input of the waveguide would be reduced, which results in enhanced coupling efficiency. The conclusion was confirmed by numerical simulation: the new method is better than straight coupling between the optical fiber and the rectangular microwaveguide, and more than 2.8 dB improvement of coupling efficiency is achieved.
authors.affiliation: College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha, Hunan 410073, China.
authors.forename: Hang
authors.initials: H
authors.lastname: Zhou
authors.forename: Zilun
authors.initials: Z
authors.lastname: Chen
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Xi
authors.forename: Jing
authors.initials: J
authors.lastname: Hou
authors.forename: Jinbao
authors.initials: J
authors.lastname: Chen