Fiber Gyroscope Light Source with Stable Broadband Spectrum
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Solution Overview
Problem
Fiber optic gyros face challenges in achieving stable scale factors, which are essential for accurate angular velocity measurements. Existing technologies either have low stability or performance degradation due to light backscattering and polarization coupling when trying to broaden the laser light bandwidth.
Innovation Solution
A light source device for a fiber optic gyroscope that includes a laser light source, a stabilizing part to lock the laser frequency, and a bandwidth broadening part using optical comb generation and white noise modulation to produce a continuous broadband spectrum, thereby stabilizing the scale factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the laser light bandwidth is broadened to reduce light backscattering and polarization coupling, then the scale factor stability is improved, but the center frequency stability deteriorates
Solution Approach 1:
The invention segments the bandwidth broadening process into two independent stages: first stabilizing the center frequency using a narrow-linewidth laser, then broadening the bandwidth using an optical comb generator and noise modulation. This segmentation allows each stage to optimize for its specific function without interfering with the other, resolving the contradiction between center frequency stability and bandwidth.
Solution Approach 2:
The invention introduces an optical comb generator as an intermediary device between the narrow-linewidth laser and the final broadband output. The optical comb generator converts the stabilized narrow-linewidth laser light into a multi-frequency comb structure, which then undergoes noise modulation to achieve broadband spectrum while preserving the original center frequency stability. This intermediary enables the transition from narrow to broadband without sacrificing frequency precision.
2Reliability
If a narrow linewidth laser is used to stabilize the center frequency, then the scale factor stability is improved, but the bandwidth is insufficient causing performance degradation
Solution Approach 1:
The invention applies dynamic noise modulation to the optical comb output to transform the static frequency spectrum into a dynamic broadband spectrum. By superimposing noise on the comb frequencies, the system dynamically expands the bandwidth while the underlying comb structure maintains the stabilized center frequency. This dynamic approach allows the system to adapt between narrow and broadband operation as needed.
Solution Approach 2:
The invention creates a composite light source by combining multiple frequency components (optical comb lines) with different characteristics. The resulting broadband light consists of numerous discrete frequency components that collectively provide both the bandwidth needed to reduce backscattering and the stabilized center frequency from the original laser, achieving properties that neither component alone could provide.
3Adaptability or versatility
If broadband light is used directly without frequency stabilization, then the bandwidth is sufficient, but the center frequency drifts causing scale factor instability
Solution Approach 1:
The invention performs frequency stabilization as a preliminary action before bandwidth broadening. By first establishing a stable center frequency using the narrow-linewidth laser, then generating the optical comb and applying noise modulation, the system ensures that the broadband light inherits the frequency stability from the initial stabilized source. This preliminary stabilization prevents center frequency drift even after broadband expansion.
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 proposed solution effectively broadens the laser light bandwidth while enhancing the stability of the scale factor, reducing performance degradation issues and improving the accuracy of angular velocity measurements.
Implementation Method 1
a laser light source that emits a laser light of a predetermined frequency
Implementation Method 2
The fiber optic gyroscope is a rotation angular velocity sensor utilizing the Sagnac effect of light
Implementation Method 3
a bandwidth broadening part that makes the laser light stabilized by the stabilizing part into a light having a continuous broadband spectrum
Data Source
Figure 1~4
Figure 5A~7B
Figure 8~9
AI summary
To provide a light source device for a fiber optic gyroscope capable of broadening the bandwidth of the laser light and improving stability of a scale factor. A light source device for a fiber optic gyroscope configured to drive a fiber optic gyroscope includes: a laser light source (10), a stabilizing part (20), and a bandwidth broadening part (30). The laser light source (10) emits a laser light of a predetermined frequency. The stabilizing part (20) stabilizes the predetermined frequency of the laser light emitted from the laser light source (10). The bandwidth broadening part (30) makes the laser light stabilized by the stabilizing part (20) into a light having a continuous broadband spectrum.