Circular Optical Antenna Array With Waveguide Fed Angled Mirrors
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Solution Overview
Problem
Current optical antenna systems face limitations in achieving uniform polarization distribution, 3D alignment, and controlling angular momentum of vector beams, with large size and complexity issues in phased arrays and grating-based systems, making it difficult to produce scalar vortices and efficiently manage sideband power in far-field patterns.
Innovation Solution
A circular optical antenna array system with phase modulators and polarization units, featuring waveguide elements with inclined mirrors, allowing for controlled phase and polarization manipulation to generate output beams with specific polarizations, including linear, azimuthal, radial, and circular polarizations, and enabling sub-wavelength element spacing for reduced sideband power and increased directionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If grating-based phased arrays are used for optical wavelength phase and polarization control, then far-field pattern control is achieved, but the array size becomes very large and quarter-wave spacing is difficult to obtain
Solution Approach 1:
The patent changes the fundamental operating parameters by using dielectric waveguides with sub-wavelength spacing instead of grating-based systems. This parameter change enables achieving λ/4 spacing (e.g., 385 nm at 1550 nm wavelength) which is difficult with conventional grating couplers, thereby reducing array size while maintaining far-field pattern control capability through phased array mechanisms
Solution Approach 2:
The patent transitions from planar grating-based arrays to three-dimensional stacked waveguide structures with inclined mirrors. This dimensional change allows achieving the required λ/4 spacing in the vertical dimension through multiple stacked layers, enabling compact integration while maintaining the necessary element spacing for optimal far-field performance
2Area of stationary object
If element spacing is reduced below λ/4 in dielectric waveguides, then array size is reduced, but coupling between adjacent waveguides increases
Solution Approach 1:
The patent uses vertically stacked waveguide layers with inclined mirrors to achieve λ/4 spacing in the vertical dimension rather than horizontally adjacent waveguides. This dimensional reorganization allows sub-wavelength spacing without increasing lateral coupling, as each waveguide layer is isolated from others by sufficient vertical separation and the inclined mirrors direct beams away from adjacent elements
Solution Approach 2:
The inclined mirrors act as intermediaries that redirect the optical beams from vertically stacked waveguides at angles that prevent coupling between adjacent waveguide elements. The mirrors serve as mediating structures that enable compact vertical stacking while maintaining isolation between waveguides through angular beam steering
3Measurement precision
If 3D stacked structure is used for phase mask alignment with Gaussian beams, then optical alignment is achieved, but integration with sources and modulators becomes difficult
Solution Approach 1:
The patent merges the phase modulation, polarization control, and beam steering functions into a single integrated planar waveguide structure. The phased array elements are directly formed by waveguide positions, eliminating the need for separate phase masks and enabling direct integration with laser sources and modulators on the same chip substrate
Solution Approach 2:
The patent replaces mechanical 3D stacking and alignment of separate phase masks with planar photonic integrated circuit fabrication techniques. The phased array geometry is defined by waveguide layer positions in the planar structure, eliminating complex mechanical alignment requirements while achieving precise optical phase control through the inherent waveguide modes
4Adaptability or versatility
If sparse arrays are used for beam steering applications, then beam steering capability is improved, but the array size becomes very large
Solution Approach 1:
The patent achieves comprehensive beam steering coverage by utilizing three-dimensional wavevector space through vertically stacked waveguide layers. This dimensional approach allows achieving the same beam steering capability as large sparse arrays but with compact dense packing, as the vertical stacking provides additional degrees of freedom for beam direction control
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively generates optical scalar and vector vortices with controlled angular momentum, reducing sideband power and enhancing beam directionality, facilitating efficient beam steering and communication applications.
Implementation Method 1
Each waveguide element comprises an inclined mirror configured to generate an output beam having an output polarization
Implementation Method 2
A phase modulator is configured to control an input phase of an input beam
Implementation Method 3
A polarization unit is configured to feed the input beam in a predetermined input polarization mode
Implementation Method 4
A plurality of waveguide elements positioned in a predetermined configuration with a predetermined element spacing
Data Source
AI summary
A circular optical antenna array system is disclosed. The system includes a phase modulator configured to control an input phase of an input beam, and a polarization unit configured to feed the input beam in a predetermined input polarization mode. The system also includes a plurality of waveguide elements positioned in a predetermined configuration with a predetermined element spacing (D). Each waveguide element comprises a mirror inclined at a predetermined angle (θ°) to generate a beam having an output polarization based on the predetermined configuration.