Low-loss wavelength-selective integrated waveguide coupler based on tilted Bragg gratings

Weisen, Mathias J.; Posner, Matthew T.; Gates, James C.; Gawith, C.B.E.; Smith, Peter G. R.; Horák, Péter

doi:10.1364/josab.36.001783

Cited by 5 publications

(9 citation statements)

References 27 publications

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“…With direct UV writing, the gratings are created using the interference pattern of two laser beams and so in principle can be made perfectly sinusoidal, which minimizes higher diffraction orders that could cause unwanted coupling to other cladding modes. Coupled mode theory including all cladding modes in this geometry has previously also confirmed that the approximation of a single coupled cladding mode is well justified for the chosen parameters [20] and comparisons of calculated coupling coefficients with full finite element simulations of tilted Bragg gratings have shown excellent agreement [28].…”

Section: Device Geometry and Theoretical Descriptionsupporting

confidence: 59%

“…Details of this coupling scheme can be found in Ref. [20]. The combination of short-and long-period gratings allows us to couple light between all four input and output ports.…”

Section: Device Geometry and Theoretical Descriptionmentioning

confidence: 99%

“…Moreover, real matrices of the form (19) have 8 degrees of freedom (8 real matrix elements of P and Q) but 4 of them are constrained by Eqs. (20), thus leaving 4 independent degrees of freedom and therefore the same number as of our fundamental transformations.…”

Section: Construction Of An Arbitrary Symmetric Unitary Matrixmentioning

confidence: 99%

“…Content may change prior to final publication. Citation information: DOI 10.1109/JPHOT.2020.3040073, IEEE Photonics Journal IEEE Photonics Journal selectivity [20].…”

Section: Introductionmentioning

confidence: 99%

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4-by-4 Integrated Waveguide Coupler Based on Bi-Directional Propagation in Two Single-Mode Waveguides

et al. 2021

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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 4×4 coupler of this form can be realized by a linear sequence of more fundamental 2 × 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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Section: Device Geometry and Theoretical Descriptionsupporting

confidence: 59%

“…Details of this coupling scheme can be found in Ref. [20]. The combination of short-and long-period gratings allows us to couple light between all four input and output ports.…”

Section: Device Geometry and Theoretical Descriptionmentioning

confidence: 99%

Section: Construction Of An Arbitrary Symmetric Unitary Matrixmentioning

confidence: 99%

“…Content may change prior to final publication. Citation information: DOI 10.1109/JPHOT.2020.3040073, IEEE Photonics Journal IEEE Photonics Journal selectivity [20].…”

Section: Introductionmentioning

confidence: 99%

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4-by-4 Integrated Waveguide Coupler Based on Bi-Directional Propagation in Two Single-Mode Waveguides

et al. 2021

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“…Tilted gratings are necessary for efficient coupling. Previously, we have developed UV writing technology for tilted gratings and demonstrated its use for waveguide-to-waveguide coupling experimentally [1] and numerically [2]. We have also simulated a unidirectional 4x4 coupler based on two two-mode waveguides [3].…”

mentioning

confidence: 99%

Four-port integrated waveguide coupler exploiting bidirectional propagation of two single-mode waveguides (Conference Presentation)

Weisen¹,

Gates²,

Gawith³

et al. 2020

Nanophotonics VIII

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We propose and numerically simulate a new and highly compact integrated 4x4 mode coupler based on two single-mode waveguides exploiting both propagation directions to double the number of modes. The two parallel waveguides are coupled via long and short-period gratings to the co-and counterpropagating directions, respectively, of a single, isolated cladding mode of the device which acts as a bus to transfer light between the waveguides. By connecting all end facets of the two waveguides to optical circulators we construct a device with four input and four output ports but only using two single-mode waveguides.

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Reconfigurable multiport switch in coupled mode devices

Ávila

Rodríguez-Lara²

2020

Phys. Scr.

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We consider a coupled mode system where the effective propagation constants of localized modes are amenable to modulation. Starting from an unmodulated system where power transfer is heavily suppressed, we demonstrate that small, periodic modulation of the propagation constants enhance power transfer using a slowly varying envelope approximation for the field mode amplitudes. We calculate an approximate modulation frequency enabling complete transfer between otherwise negligibly coupled elements. The ability to control these modulations by electrical or thermal effects allows for reconfigurable multiport switching. We use an array of coupled silica waveguides and the thermo-optic effect to test our predictions in the telecom C-band. However, this requires a refractive index modulation with period of the order 10−3 m and yields total power transfer with a propagation distance of the order of 10−1 m, which might make it unattractive for integrated photonic applications. Nevertheless, our results are valid for devices described by an equivalent coupled mode matrix for space or time propagation; for example, arrays of microring or terahertz resonators, microwave cavities, radio frequency antennas, or RLC circuits.

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Low-loss wavelength-selective integrated waveguide coupler based on tilted Bragg gratings

Cited by 5 publications

References 27 publications

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

Four-port integrated waveguide coupler exploiting bidirectional propagation of two single-mode waveguides (Conference Presentation)

Reconfigurable multiport switch in coupled mode devices

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