Reducing bend and coupling losses in integrated optical waveguid

Details Reducing bend and coupling losses in integrated optical waveguid Reducing bend and coupling losses in integrated optical waveguid

1987-04-02

1989-03-07

Lee, John D.

350 9615, 350 9617, G02B 612

Patent

active

048100498

ABSTRACT:
A groove is disposed in a substrate longitudinally along the outside radius of a bent integrated optical waveguide to constrain the mode of optical energy propagating therein such that the optical energy that would normally be radiated is confined to the waveguide, thereby reducing transmission loss through the bend. Further, to reduce coupling loss between an integrated optical waveguide and an optical fiber, two grooves are disposed longitudinally along either side of the integrated optical waveguide to constrain the mode of optical energy propagating in the waveguide to approximate the mode of the optical energy propagating in the optical fiber. To further reduce both bend and coupling losses, the ends of the grooves bend away from the waveguide.

REFERENCES:
patent: 4598039 (1986-07-01), Fischer et al.
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Geshiro et al., "A Method for Diminishing Total Transmission Losses in Curved Dielectric Optical Waveguides", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-29, No. 11, Nov. 1981, pp. 1182-1187.
Neumann, "Low Loss Dielectric Optical Waveguide Bends", Fiber and Integrated Optics, vol. 4, No. 2, pp. 203-211, 1982.
Neumann et al., "Sharp Bends with Low Losses in Dielectric Optical Waveguides", Applied Optics, vol. 22, No. 7, Apr. 1983, pp. 1016-1022.
"Dielectric Optical Waveguide Tilts with Reduces Losses", European Conference on Optical Communication, Sep. 1981, Neumann, pp. 9.3-1 through 9.3-4.
IEEE Journal of Quantum Electronics, vol. QE-18, No. 10, Oct. 1982, "Low-Loss Ti:LiNbO.sub.3 Waveguide Bends at .lambda.=1.3 .mu.m," William J. Minford, Steven K. Korotky, and Rod C. Alferness, pp. 1802 through 1806.
"Greatly Reduced Losses for Small-Radius Bends in Ti:LiNbO.sub.3 Waveguides", S. K. Korotky, E. A. J. Marcatili, J. J. Veselka, R. H. Bosworth, AT&T Bell Laboratories, Holmdel, NJ.
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