Polarization Gain Compensation in a Fiber Optic Surveillance System
Patent Information
- Application Number
- DE602022016069
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2022-05-24
- Publication Date
- 2025-06-18
- Estimated Expiration
- 2042-05-24
AI Technical Summary
Existing distributed optical sensing systems using optical fibers face challenges in accurately detecting mechanical perturbations due to gain imbalances between polarization channels in coherent optical transmitters and receivers, which can lead to polarization fading and reduced sensing sensitivity.
The system employs a MIMO sensing technique with a coherent optical transmitter and receiver that transmit and receive test signals on orthogonal polarizations, and an optical switch for back-to-back connection, allowing for estimation and compensation of polarization gain imbalances using an electrical processor.
This approach enables accurate measurement of light signal backscattered by the optical fiber link, effectively mitigating the impact of polarization fading and enhancing the sensing sensitivity for detecting mechanical perturbations along the optical fiber.