The intrinsic cutoff wavelength of the LP11 mode is investigated using three different types of measurement for an ITT single-mode fiber. Characterization of the far-field pattern of the LP01 mode gives a cutoff value ~660 nm, a near-field transmission experiment gives ~690 nm, and a refracted power measurement gives ~830 nm. We conclude that the refracted power technique is the best experimental method for the determination of the intrinsic cutoff wavelength of a fiber sample. The effect of the loss of coupling efficiency into the LP11 mode as cutoff is approached on the transmission and refracted power experiments is noted.
© 1983 Optical Society of America
Original Manuscript: May 10, 1982
Published: April 1, 1983
C. C. Wang, C. A. Villarruel, and W. K. Burns, "Comparison of cutoff wavelength measurements for single-mode waveguides," Appl. Opt. 22, 985-990 (1983)