Abstract
The new theory and technique of Multi-Addressed Fiber Bragg Structure (MAFBS) usage in Microwave Photonics Sensor Systems (MPSS) is presented. This theory is the logical evolution of the theory of Addressed Fiber Bragg Structure (AFBS) usage as sensors in MPSS. The mathematical model of additive response from a single MAFBS is presented. The MAFBS is a special type of Fiber Bragg Gratings (FBG), the reflection spectrum of which has three (or more) narrow notches. The frequencies of narrow notches are located in the infrared range of electromagnetic spectrum, while differences between them are located in the microwave frequency range. All cross-differences between optical frequencies of single MAFBS are called the address frequencies set. When the additive optical response from a single MAFBS, passed through an optic filter with an oblique amplitude–frequency characteristic, is received on a photodetector, the complex electrical signal, which consists of all cross-frequency beatings of all optical frequencies, which are included in this optical signal, is taken at its output. This complex electrical signal at the photodetector’s output contains enough information to determine the central frequency shift of the MAFBS. The method of address frequencies analysis with the microwave-photonic measuring conversion method, which allows us to define the central frequency shift of a single MAFBS, is discussed in the work.
Highlights
Common problems of Fiber Bragg Gratings (FBG) array interrogation in optical sensor systems are their complexity and the high cost of interrogators due to the technique of interrogation and FBG multiplexing [1,2,3,4,5]
We normalize all the task variables, so that the maximum central frequency shifting of the Multi-Addressed Fiber Bragg Structure (MAFBS) does not exceed 125 GHz or Ω0, which is equal to 1 conventional unit
Studies have confirmed the perspectivity of MAFBS usage instead of Addressed Fiber Bragg Structure (AFBS) for Microwave idea is that in FBG
Summary
Common problems of Fiber Bragg Gratings (FBG) array interrogation in optical sensor systems are their complexity and the high cost of interrogators due to the technique of interrogation and FBG multiplexing [1,2,3,4,5]. The address frequency is invariant to stress or temperature fields; it is invariant to AFBS microwave range) and as a sensor of measurement system The AFBS in sensor systems is used both as a two-frequency source It allows design abetween microwave-photonic sensor to thetofact that it has fields) two narrow optical frequencies withus thetodifference them being in the system based on arrays of AFBSs, on condition that the set of address frequencies in the array microwave range) and as a sensor of measurement system Frequencies allows us to expand the sensor capacity of the measurement system; it allows us to increase the accuracy of central wavelength determination
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