A low-insertion-loss, all-single-mode fiber, wavelength-division-multiplexing filter comprising a four-port polished coupler and a strong fiber grating is demonstrated. The device operates in a novel way by a process we call grating-frustrated directional coupling. A fiber grating, present in only one half of the coupler, frustrates the transference of power to the other half within a narrow wavelength range. The performance of a prototype device—a 1535-nm channel-dropping filter with 0.7-nm bandwidth, 70% peak transmission, and 13-dB isolation—shows great promise for wavelength-division-multiplexing and line-filtering applications.
© 1994 Optical Society of America
Original Manuscript: September 20, 1993
Published: February 1, 1994
J.-L. Archambault, P. St. J. Russell, S. Barcelos, P. Hua, and L. Reekie, "Grating-frustrated coupler: a novel channel-dropping filter in single-mode optical fiber," Opt. Lett. 19, 180-182 (1994)