Wavelength-selective coupling between vertically integrated thin-film waveguides via supermode by a pair of grating couplers

Grating coupling between vertically integrated waveguides via supermode was discussed and demonstrated. Two thin-film waveguides with grating couplers were stacked on a substrate. A guided wave in one waveguide is converted by a grating coupler to a supermode propagating contradirectionally, and the...

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Bibliographic Details
Published in:IEEE photonics technology letters 2001-07, Vol.13 (7), p.678-680
Main Authors: Ura, S., Nishida, R., Suhara, T., Nishihara, H.
Format: Article
Language:English
Subjects:
Couplers
Gratings
Integrated optics
Joining
Multiplexing
Optical coupling
Optical interconnections
Optical waveguide theory
Optical waveguides
Photonics
Selectivity
Substrates
Thin films
Transistors
Wave propagation
Waveguides
Wavelength division multiplexing
Wavelengths
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Summary:Grating coupling between vertically integrated waveguides via supermode was discussed and demonstrated. Two thin-film waveguides with grating couplers were stacked on a substrate. A guided wave in one waveguide is converted by a grating coupler to a supermode propagating contradirectionally, and then converted by another grating coupler to a guided wave in the other waveguide. The coupling shows high wavelength selectivity, and the wavelength-division add/drop multiplexing function can be combined. A demonstrator was designed and fabricated. Theoretically predicted coupling efficiency was almost 100% with wavelength selectivity of 2 nm, while the experimentally obtained value was 40% in the efficiency and 1 nm in the selectivity.
ISSN:1041-1135
1941-0174
DOI:10.1109/68.930412