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Multiplexing systems for interferometric sensors with short imbalances.
Applied Optics
|June 5, 2010
Summary
A new method enables multiplexing of interferometric sensors using parallel connections and time delays. A sawtooth frequency modulated source creates unique beat frequency carriers for each sensor, allowing for efficient signal allocation.
Area of Science:
- Optoelectronics
- Sensor Technology
- Signal Processing
Background:
- Interferometric sensors with short path imbalances, such as integrated-optic, two-mode, or polarimetric fiber sensors, are crucial in various applications.
- Multiplexing these sensors is challenging due to signal interference and complexity.
Purpose of the Study:
- To propose a novel method for multiplexing interferometric sensors with short path imbalances.
- To demonstrate the feasibility of frequency division multiplexing for such sensor systems.
Main Methods:
- Sensors are connected in parallel, each with a distinct time delay relative to a common reference arm.
- A sawtooth frequency modulated (FM) light source is employed.
- An allocation scheme for frequency division multiplexing (FDM) is presented.
Main Results:
- Different beat frequency carriers are generated for each sensor by the FM source and time delays.
- The optical signal power and the maximum number of multiplexed sensors are estimated.
- The proposed scheme allows for effective frequency division multiplexing.
Conclusions:
- The novel method provides an effective approach for multiplexing interferometric sensors.
- The technique leverages frequency division multiplexing with a sawtooth FM source for distinct sensor signal identification.
- This advancement has implications for expanding the capabilities of optical sensing systems.
