In order to implement a fiber-optic Fabry–Perot tunable filter with a simple configuration, a concave mirror is made at the end of the optical fiber. The concave mirror is fabricated by attaching a thin polycarbonate (PC) film on the fiber end, pressing the PC film with a fiber ball to form a dimple, and then depositing a multilayer dielectric mirror. The concave mirror aligned to the fiber core makes the cavity alignment easy with a simple alignment configuration. Because of the self-alignment function of this cavity, a small, reliable, and fast filter could be fabricated.
© 2012 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: September 28, 2011
Revised Manuscript: December 23, 2011
Manuscript Accepted: December 29, 2011
Published: February 10, 2012
Yunhae Yeh and Se Hoon Park, "Fiber-optic tunable filter with a concave mirror," Opt. Lett. 37, 626-628 (2012)