Optical waveguides – With optical coupler – Particular coupling function
Patent
1990-07-27
1991-09-17
Lee, John D.
Optical waveguides
With optical coupler
Particular coupling function
385 37, 385 45, 385130, 359127, G02B 626
Patent
active
050489097
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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D. C. Johnson et al., "New Design Concept for a Narrowband . . . ", Electronics Letters, Jun. 18, 1987, vol. 23, No. 13, pp. 668-669.
R. C. Alferness et al., "Narrowband GaInAsP/InP Waveguide Grating-Folded . . . ", Electronics Letters, Feb. 4, 1988, vol. 23, No. 3, pp. 150-151.
R. F. Kazarinov et al., "Narrow-Band Resonant Optical Reflectors and Resonant . . . ", IEEE Journal of Quantum Electronics, vol. QE-23, No. 9, Sep. 1987, pp. 1419-1425.
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 M. J.
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