Optical Gyroscope Comb Locking for Kerr-Limited Signal Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Resonator fiber optic gyroscopes using narrow linewidth lasers are susceptible to optical Kerr effects, leading to weak output signals due to nonlinear refractive index modifications, while broadband light sources reduce these effects but cause substantial power loss and detection challenges.
Innovation Solution
An optical gyroscope design that utilizes an optical frequency comb generator to lock optical signals to resonance frequencies of the optical resonator, ensuring efficient power transfer and intensity detection by maintaining frequency lock during rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a narrow linewidth laser source is used to generate optical signals, then the optical Kerr effect is exacerbated, but the output signal intensity remains sufficient for detection
Solution Approach 1:
The broadband optical signal is segmented into multiple discrete frequency components using an optical frequency comb generator. Each comb line is independently locked to a resonator mode, distributing the total optical power across multiple frequency components rather than concentrating it in a single narrow linewidth, thereby reducing the optical Kerr effect while maintaining sufficient detection signal intensity.
Solution Approach 2:
The invention changes the spectral parameter of the light source from narrow linewidth to broadband frequency comb. By generating an optical frequency comb with multiple equidistant frequency lines and locking each to a resonator mode, the system transforms the spectral distribution to reduce peak intensity effects while maintaining total power efficiency.
2Object-affected harmful factors
If a broadband light source is used to reduce optical Kerr effects, then the output signal intensity substantially decreases, making detection difficult
Solution Approach 1:
The invention implements feedback control by locking each optical frequency comb line to a corresponding resonator mode. This feedback mechanism ensures that the broadband optical signal maintains phase coherence and constructive interference at the detection point, thereby preserving sufficient output signal intensity for detection while still benefiting from the reduced optical Kerr effect of broadband sources.
Solution Approach 2:
The optical frequency comb is pre-generated and pre-locked to the resonator modes before the optical signal enters the resonator. This preliminary action ensures that the broadband light is properly conditioned with correct phase relationships established in advance, enabling efficient power transfer and maintaining detectable signal intensity after resonator propagation.
3Loss of energy
If an optical frequency comb is locked to resonance frequencies, then power efficiency is enhanced, but device complexity increases
Solution Approach 1:
The optical frequency comb generator serves multiple functions: it generates broadband optical signals, provides frequency reference locking, and enables phase-coherent detection. By integrating these functions into a single comb-based system, the invention reduces overall device complexity compared to using separate narrow linewidth lasers for each function while simultaneously enhancing power efficiency through resonator locking.
Data Source
AI summary
Embodiments utilize an optical frequency comb generator coupled to an optical resonator of an optical gyroscope. The optical frequency comb generator generates an optical frequency comb having frequency peaks that each correspond to a respective resonance frequency of the optical resonator. A control servo can be coupled to the optical frequency comb generator and controls the optical frequency comb output from the optical frequency comb generator. In doing so, the optical frequency comb remains tuned to the resonance frequencies of the optical resonator during gyroscope operation.