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The effect of wavefront tilt on mode conversion in asymmetrical Y-branch waveguides

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2 Author(s)
Frenette, N.J.P. ; Dept. of Electr. Eng., Queen''s Univ., Kingston, Ont., Canada ; Cartledge, J.C.

Step approximation models provide a simple method of studying mode propagation and mode conversion in planar Y-branch optical waveguides. They are, however, only applicable to small branching angles since they neglect the wavefront tilt of the separating waveguides. A phasefront tilt approximation which can be used in conjunction with the local normal mode profile of the five-layer structure is introduced. By rotating the Y-branch about the branching point, a symmetrical branching angle is defined so that the phasefront approximation can be used not only for symmetrical Y-branches, but also for Y-branches which have an asymmetrical branching angle or have a change in branching angle along the longitudinal axis of the Y-branch.<>

Published in:

Quantum Electronics, IEEE Journal of  (Volume:25 ,  Issue: 4 )

Date of Publication:

April 1989

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