Optical waveguides – With optical coupler – Particular coupling function
Patent
1991-05-31
1992-03-03
Lee, John D.
Optical waveguides
With optical coupler
Particular coupling function
385 45, 385 47, G02B 626
Patent
active
050938762
ABSTRACT:
A wavelength selective structure is coupled to an adiabatic Y-coupler via a multimode section which supports both symmetric and antisymmetric modes. One single mode branch of the coupler converts guided light to a symmetric mode, whereas the other single mode branch converts guided light to an anti-symmetric mode. The structure, which includes a pair of single mode waveguide arms coupled to the common section and a reflection device (such as a grating or ROR) located in each arm, converts reflected light from a symmetric mode to an anti-symmetric mode and conversely. Applications described include a channel dropping filter and channel balancing apparatus for WDM systems, and a dispersion compensator for fiber optic systems.
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C. H. Henry et al., "A Narrow-Band Si.sub.3 N.sub.4 -SiO.sub.2 Resonant Optical Reflector", IEEE Journal of Quantum Electronics, vol. QE-23, No. 9, Sep. 1987, pp. 1426-1428.
Henry Charles H.
Kazarinov Rudolf F.
Shani Yosi
AT&T Bell Laboratories
Barns Stephen W.
Lee John D.
Urbano Michael J.
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