1989-11-13
1990-12-04
Lee, John D.
350 9615, G02B 614
Patent
active
049749315
ABSTRACT:
A mode coupler is disclosed which utilizes a circularly symmetric perturbation in an electromagnetic waveguide. Due to the circular symmetry of the perturbation, exact cross-sectional alignment of the perturbations is not needed when several of the devices are cascaded. Further, the mode coupling response is wavelength dependent, and therefore, may be employed in electromagnetic filtering applications.
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"Two-Mode Fiber Modal Coupler", May 1984, vol. 9, No. 5, Optics Letters, R. C. Youngquist, et al., pp. 177-179.
"Fiber-Optic Modal Coupler Using Periodic Microbending", Mar. 1986, vol. 11, No. 3, Optics Letters, J. N. Blake et al, pp. 177-179.
"Mode Conversion Caused by Surface Imperfections of a Dielectric Slab Waveguide" by Dietrich Marcuse, The Bell System Technical Journal, Dec., 1969, pp. 3187-3215.
"Mode Conversion Caused by Diameter Changes of a Round Dielectric Waveguide" by Dietrich Marcuse and Richard M. Derosier, The Bell System Technical Journal, Dec. 1969, pp. 3217-3232.
AT&T Bell Laboratories
Lee John D.
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