A method for the measurement of the far-field power radiation pattern in axially symmetrical and nonsymmetrical single-mode optical fibers is proposed. The method, based on monitoring of the power passed through a variable-width slit in the far field, gives the power distribution as an associated Gauss–Laguerre expansion. The experimental setup permits the study of the power distribution and mode-field diameter dependence on the wavelength. Results for different types of single-mode optical fiber, including polarization-maintaining types, are presented.
© 1990 Optical Society of America
Original Manuscript: November 7, 1989
Manuscript Accepted: February 9, 1990
Published: April 15, 1990
M. J. Oquiñena, J. Pelayo, F. Villuendas, and J. B. Marqués, "Far-field power-distribution measurement in axially symmetrical and nonsymmetrical fibers using a variable-width slit," Opt. Lett. 15, 420-422 (1990)