An all-fiber-optic frequency shifter is demonstrated that uses mode coupling between the LP01 and LP11 modes by a traveling acoustic flexural wave guided along the optical fiber. The input and output leads of this frequency shifter are single-mode fibers. Unity mode-conversion efficiency for cw operation is achieved at 8-MHz frequency shift with about 0.25 W of electrical input power. Carrier and image sideband suppression of 15 and 35 dB, respectively, are demonstrated.
© 1986 Optical Society of America
Original Manuscript: January 27, 1986
Manuscript Accepted: March 24, 1986
Published: June 1, 1986
B. Y. Kim, H. E. Engan, H. J. Shaw, and J. N. Blake, "All-fiber acousto-optic frequency shifter," Opt. Lett. 11, 389-391 (1986)