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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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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description 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.
doi_str_mv 10.1109/68.930412
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source IEEE Electronic Library (IEL) Journals
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
title Wavelength-selective coupling between vertically integrated thin-film waveguides via supermode by a pair of grating couplers
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