Adiabatic reflection Y-coupler apparatus
AssigneeLucent Technologies Inc.
InventorsCharles H. Henry, Rudolf F. Kazarinov, Yosi Shani
Life of this patent
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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 fiber and channel balancing apparatus for WDM systems, and a dispersion compensator for fiber optic systems.
Claims23
Adiabatic reflection apparatus comprising
- an adiabatic Y-coupler having a first single mode waveguide branch which converts guided light to a symmetric mode, a second single mode waveguide branch which converts guided light to an anti-symmetric mode, and a common multimode waveguide section where said first and second branches merge and which supports both symmetric and anti-symmetric modes, and
- a wavelength selective structure having one end coupled to said common section, said structure comprising at least two single mode waveguide arms coupled to said common section, and a reflection device disposed in each of said arms, said devices being designed to reflect guided light at atleast one predetermined wavelength .lambda..sub.n
- said waveguide arms and said reflection devices being designed to convert said reflected light to an anti-symmetric mode and conversely.
An adiabatic Y-coupler comprising
- a first structure having a first single mode waveguide branch which converts guided light to a symmetric mode, a second single mode waveguide branch which converts guided light to an anti-symmetric mode, and a common multimode waveguide section where said first and second branches merge and which supports both symmetric and anti-symmetric modes, said common section comprises physically separate, but optically coupled single mode waveguides, and
- a second structure having one end coupled to said common section, said second structure comprising at least two single mode waveguide arms coupled to said common section.
Dependencies are inferred from the claim text.