Abstract

The excitation efficiencies of a few lower order modes in a W-type fiber have been studied when the modes are excited with a tilted as well as offset Gaussian beams. The effect of beam size, angle of incidence the radius of curvature of the incident wavefront, and the off-axis displacement has been obtained. It is found that in order to couple maximum power into the fundamental mode, the incident wavefront must be plane and the beam must be incident axially along the fiber with a suitable value of the beam size.

© 1978 Optical Society of America

Efficient coupling of incoherent light into optical fibers and bundles

K. Thyagarajan, Anurag Sharma, and A. K. Ghatak
Appl. Opt. 17(15) 2416-2419 (1978)

Excitation of Fundamental and Low-Order Modes of Optical Fiber Waveguides by Gaussian Beams. 1: Tilted Beams

Masaaki Imai and Elmer H. Hara
Appl. Opt. 13(8) 1893-1899 (1974)

Excitation of a doubly clad optical fiber by misaligned Gaussian beams

John C. Cartledge
Appl. Opt. 17(13) 2086-2091 (1978)

Excitation of the Fundamental and Low-Order Modes of Optical Fiber Waveguides with Gaussian Beams. 2: Offset Beams

Masaaki Imai and Elmer H. Hara
Appl. Opt. 14(1) 169-173 (1975)

Selective excitation of parabolic-index optical fibers by Gaussian beams

J. Saijonmaa, A. B. Sharma, and S. J. Halme
Appl. Opt. 19(14) 2442-2452 (1980)