4-by-4 integrated waveguide coupler based on bi-directional propagation in two single-mode waveguides
4-by-4 integrated waveguide coupler based on bi-directional propagation in two single-mode waveguides
We propose and investigate theoretically the use of bi-directional propagation of light in silica integrated coupled waveguide structures for linear optical processing of fiber-coupled photons. We show that the class of linear operations that can be implemented in such a system is given by symmetric and unitary matrices. We present how an arbitrary $4\times 4$ coupler of this form can be realized by a linear sequence of more fundamental $2\times 2$ couplers and single-waveguide phase shifters and discuss in detail the implementation in a silica integrated platform utilizing direct UV-written waveguides and long- and short-period grating couplers with tilted gratings for optimized coupling efficiency.
Bragg gratings, Bragg gratings, Couplings, Gratings, Optical coupling, Optical waveguides, Optical waveguides, Silicon compounds, Transmission line matrix methods, quantum processing
Weisen, Mathias John
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Gates, James C.
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Gawith, Corin
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Smith, Peter G.R.
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Horak, Peter
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Weisen, Mathias John
6a6bd787-56ac-4902-80c4-b9e251338824
Gates, James C.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Gawith, Corin
926665c0-84c7-4a1d-ae19-ee6d7d14c43e
Smith, Peter G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Horak, Peter
520489b5-ccc7-4d29-bb30-c1e36436ea03
Weisen, Mathias John, Gates, James C., Gawith, Corin, Smith, Peter G.R. and Horak, Peter
(2020)
4-by-4 integrated waveguide coupler based on bi-directional propagation in two single-mode waveguides.
IEEE Photonics Journal.
(doi:10.1109/JPHOT.2020.3040073).
Abstract
We propose and investigate theoretically the use of bi-directional propagation of light in silica integrated coupled waveguide structures for linear optical processing of fiber-coupled photons. We show that the class of linear operations that can be implemented in such a system is given by symmetric and unitary matrices. We present how an arbitrary $4\times 4$ coupler of this form can be realized by a linear sequence of more fundamental $2\times 2$ couplers and single-waveguide phase shifters and discuss in detail the implementation in a silica integrated platform utilizing direct UV-written waveguides and long- and short-period grating couplers with tilted gratings for optimized coupling efficiency.
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Bidirectional_coupler
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Accepted/In Press date: 9 November 2020
e-pub ahead of print date: 24 November 2020
Keywords:
Bragg gratings, Bragg gratings, Couplings, Gratings, Optical coupling, Optical waveguides, Optical waveguides, Silicon compounds, Transmission line matrix methods, quantum processing
Identifiers
Local EPrints ID: 445555
URI: http://eprints.soton.ac.uk/id/eprint/445555
ISSN: 1943-0655
PURE UUID: 8d588bfb-9843-417a-b318-1a3716cb1431
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Date deposited: 16 Dec 2020 17:31
Last modified: 18 Feb 2021 16:59
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