Chip-Integrated Optical Gyroscope Using Weak Pulsed Laser
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Solution Overview
Problem
Existing optical gyroscopes, both fiber-based and ring laser-based, face challenges in achieving high sensitivity in compact, chip-integrated forms, particularly due to the requirement for high-quality manufacturing and the limitations of single photon sources and detectors.
Innovation Solution
The use of a weak, pulsed laser source instead of a single photon source for quantum amplification in a chip-integrated optical gyroscope, leveraging the Hong-Ou-Mandel interference effect to achieve high sensitivity without the need for complex single photon components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If chip-integrated optical gyroscopes are implemented, then compactness is improved, but manufacturing precision requirements increase significantly
Solution Approach 1:
The patent changes the operational parameters by using weak pulsed laser light instead of continuous strong light, and operates the chip-integrated gyroscope at room temperature rather than requiring cryogenic temperatures. This allows chip-integrated implementation while maintaining acceptable manufacturing tolerances and achieving high sensitivity through quantum effects at practical operating conditions.
Solution Approach 2:
The patent employs a composite structure combining classical optical components (waveguides, beam splitters, phase shifters) with quantum optical effects (entanglement, Hong-Ou-Mandel interference) on a single chip. This hybrid approach enables compact integration while achieving sensitivity levels previously only attainable with large-scale systems.
2Measurement precision
If single photon sources and detectors are used for quantum amplification, then sensitivity is improved, but device complexity increases
Solution Approach 1:
The patent uses weak pulsed laser light as an intermediary that bridges classical and quantum regimes. The laser pulses are weakened through controlled loss mechanisms (attenuation in waveguides, scattering, absorption) to achieve single-photon-level intensities without requiring complex single-photon sources. This intermediary approach enables quantum effects while maintaining system simplicity.
Solution Approach 2:
The patent replaces complex mechanical single-photon generation systems with a simple pulsed laser source combined with optical attenuation. Instead of using sophisticated quantum light sources, the system uses classical laser pulses that are weakened to single-photon levels through passive loss mechanisms, thereby substituting a complex quantum system with a simpler classical system that achieves the same effect.
3Volume of moving object
If single photon components are chip-integrated, then compactness is improved, but operational temperature range is limited
Solution Approach 1:
The patent fundamentally changes the temperature parameter by demonstrating that quantum optical effects (entanglement, Hong-Ou-Mandel interference) can be maintained and measured at room temperature in chip-integrated systems. This eliminates the need for cryogenic cooling infrastructure while preserving quantum sensitivity, enabling practical deployment of compact sensors in diverse environments.
4Measurement precision
If high-quality manufacturing is achieved in chip-integrated systems, then sensitivity approaches large-scale systems, but manufacturing difficulty increases
Solution Approach 1:
The patent changes the performance parameter by using quantum optical effects (entanglement-enhanced measurement, Hong-Ou-Mandel interference) that provide sensitivity enhancement without requiring proportionally higher manufacturing precision. The quantum effects amplify the measurement signal, allowing standard manufacturing processes to achieve high sensitivity that would otherwise require ultra-precise fabrication.
Solution Approach 2:
The patent employs ring resonators with high quality factors (Q-factors) that create strong light confinement and multiple round-trip passes through the sensing region. This curved optical path geometry enhances the Sagnac effect accumulation while being compatible with standard semiconductor fabrication processes, achieving high sensitivity without excessive manufacturing difficulty.
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
This approach enables the development of a compact, robust, and highly sensitive rotation rate sensor that can operate over a broad temperature range, overcoming the limitations of previous technologies.
Implementation Method 1
the Hong-Ou-Mandel interference effect to achieve high sensitivity without the need for complex single photon components
Implementation Method 2
optical gyroscopes that are based on the Sagnac effect
Implementation Method 3
constructive and destructive interference occurs and the result is a light wave whose intensity varies in proportion to the rotation rate
Data Source
AI summary
An optical rotation rate sensor. The sensor includes a laser light source for generating weak light pulses, optically connected to a photonic waveguide, optically connected to a first interference coupler that includes a first input and two first outputs, optically connected to a second interference coupler that includes two second inputs and two second outputs, optically connected to at least one first sensor waveguide for showing the Sagnac effect, optically connected to a third interference coupler that includes two third inputs and two third outputs, optically connected to two photodetectors, the photonic waveguide, the first interference coupler, the second interference coupler, the third interference coupler and the sensor waveguide being integrated on a shared substrate.