Programmable Photonic Circuit With MEMS Waveguide Phase Shifter
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Solution Overview
Problem
Programmable photonic integrated circuits (PPICs) face challenges in scalability due to high optical loss, power consumption, and area constraints, particularly with tunable optical couplers and optical phase shifters, which hinder the integration of a large number of components in a limited area.
Innovation Solution
A programmable photonic circuit design featuring a tunable optical coupler with movable waveguides and an optical phase shifter that adjusts optical coupling efficiency and phase by changing the gap between waveguides, utilizing MEMS-based actuators for precise control with low power consumption, allowing for efficient integration in a compact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the length of the waveguide is increased to achieve one wavelength optical path change, then the optical phase shifter can achieve the required phase modulation, but the area occupied by the component increases making integration in limited area difficult
Solution Approach 1:
The patent changes the physical parameters of the waveguide by introducing a perturbation waveguide that modifies the effective refractive index of the main waveguide. This allows achieving the required optical path length change (one wavelength) through refractive index modulation rather than increasing physical length, thereby reducing the area occupied by the phase shifter while maintaining phase modulation capability
Solution Approach 2:
The perturbation waveguide acts as an intermediary element that indirectly affects the main waveguide's optical properties. By placing the perturbation waveguide adjacent to the main waveguide and controlling its refractive index through external stimuli (heat, pressure, electric field), the patent achieves phase modulation without requiring the main waveguide to be excessively long
2Reliability
If high power is used to increase the refractive index change amount for achieving one wavelength optical path change, then the phase modulation requirement is met, but the power consumption increases making it difficult to drive a large number of components
Solution Approach 1:
The patent optimizes the parameters of the perturbation waveguide (dimensions, material properties, positioning) to achieve maximum refractive index change efficiency with minimum power input. By carefully designing the perturbation waveguide's cross-sectional area and its coupling to the main waveguide, the system achieves the required phase modulation with lower power consumption compared to conventional approaches
Solution Approach 2:
The patent employs dynamic control mechanisms (MEMS-based actuators) that can adjust the perturbation waveguide's properties in real-time, allowing the system to achieve the required phase modulation with optimized power input at different operational states, thereby reducing overall power consumption while maintaining reliability
3Adaptability or versatility
If the number of components is increased to enhance PPIC functionality, then the circuit capability is improved, but the optical loss increases and integration in limited area becomes difficult
Solution Approach 1:
The patent combines multiple functions into integrated components. The perturbation waveguide structure serves both as a phase modulation element and as a means to reduce optical loss by optimizing light confinement and reducing coupling losses between adjacent waveguides. This merging of functions allows increasing circuit capability while controlling optical loss
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 design achieves low power consumption and reduced optical loss, enabling the expansion of PPICs to a larger scale while maintaining efficient integration and operation.
Implementation Method 1
each of the first actuator and the second actuator includes a fixed part and a movable part that is provided to be movable with respect to the fixed part and move the movable waveguide under control by the control unit
Implementation Method 2
the optical phase shifter being configured to change a phase of an optical signal traveling through the one waveguide, by changing an effective refractive index of an optical mode of the one waveguide according to adjustment of a gap between the one waveguide and the perturbation waveguide
Data Source
AI summary
The provided programmable photonic circuit includes a tunable optical coupler, an optical phase shifter, and a control unit. First and second waveguides are provided in a first section corresponding to each other in the tunable optical coupler, and the tunable optical coupler includes a first actuator to adjust optical coupling efficiency of an optical signal between the first and second waveguides. One waveguide of the first and second waveguides, and a perturbation waveguide are provided in a second section corresponding to each other in the optical phase shifter, and the optical phase shifter includes a second actuator to change the phase of an optical signal traveling through the one waveguide, by changing an effective refractive index of an optical mode of the one waveguide according to the gap between the one waveguide and the perturbation waveguide. The control unit controls driving signals applied to the first and second actuators.