Abstract

The modal excitation efficiency of a doubly clad optical fiber is determined by using an approximate method which utilizes a series representation of the incident beam in terms of the orthogonal waveguide modes. The dependence of the excitation efficiency on the refractive index difference between the outer and inner cladding, the beam radius of curvature and spot size, as well as a tilt or offset misalignment is investigated. These factors have a pronounced effect on the efficiency and practical tolerances for efficient mode launching may be obtained from the results.

© 1978 Optical Society of America

Mode excitation by tilted and offset Gaussian beams in W-type fibers

Ram Chandra, K. Thyagarajan, and A. K. Ghatak
Appl. Opt. 17(17) 2842-2847 (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 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)

Excitation of an optical fiber by a Gaussian beam

M. Mostafavi, T. Itoh, and R. Mittra
Appl. Opt. 14(9) 2190-2193 (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)