Waveguide Resonator Light Routing for Low-Power Optical Isolation
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Solution Overview
Problem
Existing miniaturized optical systems, such as photonic integrated circuits, face challenges in efficiently guiding laser light with low power consumption while preventing undesired back-reflections, often requiring magnets or significant power usage.
Innovation Solution
A device comprising a waveguide with a resonator forming a resonant traveling wave (RTW) that provides different perturbations for light propagating in opposite directions, combined with a differentiating element to selectively control light direction, allowing efficient guiding with low power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If magnets are used to control light directionality, then light guiding control is achieved, but device complexity and power consumption increase
Solution Approach 1:
The patent replaces magnetic field-based mechanical control systems with an optical field-based system using resonant traveling waves. The resonator generates optical waves that interact with the laser light to provide directional control, eliminating the need for magnets and associated mechanical complexity.
Solution Approach 2:
The patent changes the control parameter from magnetic field strength to resonant wave frequency and amplitude. By adjusting the resonator's operating parameters, the system achieves light directionality control without requiring complex magnetic field manipulation, thereby reducing device complexity.
2Ease of operation
If substantial power is used to control light directionality, then light guiding control is achieved, but power consumption increases
Solution Approach 1:
The patent utilizes resonant oscillation of optical waves within the resonator to achieve light directionality control. The resonant traveling waves are generated at specific frequencies that match the resonator's natural oscillation modes, allowing efficient energy transfer and reduced power consumption compared to non-resonant methods.
Solution Approach 2:
The resonator maintains continuous resonant oscillation once excited, allowing the system to sustain light directionality control with minimal additional power input. The stored energy in the resonant waves continues to interact with the laser light, providing sustained directional control without requiring proportional increases in power consumption.
3Reliability
If optical isolators are used to prevent back-reflections, then light control is achieved, but power consumption increases
Solution Approach 1:
The resonator creates a feedback mechanism where resonant traveling waves continuously interact with the laser light. This feedback interaction provides directional control and prevents back-reflections by selectively enhancing forward-propagating light while suppressing backward-propagating light, achieving reliable light control with reduced power consumption.
Solution Approach 2:
The system changes the operational parameters of the optical isolator by using resonant wave interactions instead of traditional absorptive or reflective mechanisms. This parameter change allows the system to achieve back-reflection prevention with lower power consumption by exploiting the resonant enhancement of specific propagation directions.
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 device effectively controls light propagation, enabling optical isolators and circulators with reduced power consumption, ensuring efficient output and minimizing back-reflections in miniaturized devices.
Implementation Method 1
a resonator configured to form a resonant traveling wave (RTW) to be propagated along a direction of the waveguide, wherein the RTW is configured to affect propagation of the laser light in the waveguide
Implementation Method 2
a waveguide configured to propagate the laser light between a first port and a second port
Data Source
Figure 1
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AI summary
A device (100; 200; 300) for guiding laser light comprises: a waveguide (110; 210; 310) configured to propagate the laser light between a first port (102; 202; 302) and a second port (104; 204; 304); a resonator (120; 220; 320) configured to form a resonant traveling wave, RTW, to be propagated along a direction of the waveguide (110; 210; 310), wherein the RTW is configured to provide a first perturbation of the laser light propagating from the first port (102; 202; 302) towards the second port (104; 204; 304) and a second perturbation of oppositely directed laser light; and a differentiating element (150; 250; 350) configured to act selectively on the laser light and/or the second perturbation of the oppositely directed laser light such that the device (100; 200; 300) is configured to control a direction of light being guided by the device (100; 200; 300).