We demonstrate a simple, effective technique for launching higher-order modes into a double-mode optical fiber by using an optical phase shifter at the input end. The suppression of the lowest-order mode was measured (but not limited) to be 27 dB.
© 1994 Optical Society of America
Original Manuscript: September 13, 1993
Published: April 1, 1994
W. Q. Thornburg, B. J. Corrado, and X. D. Zhu, "Selective launching of higher-order modes into an optical fiber with an optical phase shifter," Opt. Lett. 19, 454-456 (1994)