Optical fiber ring eigen frequency measurement device and method based on sine wave modulation and second harmonic detection

A sine wave modulation and second harmonic technology, which is used in measurement devices, testing optical properties, instruments, etc., can solve the problems of high measurement cost and insufficient measurement accuracy of the eigenfrequency of fiber loops, so as to improve measurement accuracy and reduce costs. Effect

Inactive Publication Date: 2014-02-26
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

This patented technology uses sinusoidal signals rather than rectangular ones because they are easier to measure with less expensive components compared to other methods like quadrature phase shift keying. By applying different types of modulations on both sides of each carrier pair, it becomes more accurate at determining its duty cycles or pulses within certain limits without increasing their complexity. Additionally, this method allows for precise measurements when changing frequencies between two carriers, further improving upon existing techniques such as time division multiplexed systems. Overall, these technical improvements make better quality control processes possible during production.

Problems solved by technology

This patented technical problem addressed by this patents relates to accurately determining the phase difference between two different signals (light) transmitted within a looped fiberglass optic sensor system with circular polarization rotation.

Method used

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  • Optical fiber ring eigen frequency measurement device and method based on sine wave modulation and second harmonic detection
  • Optical fiber ring eigen frequency measurement device and method based on sine wave modulation and second harmonic detection
  • Optical fiber ring eigen frequency measurement device and method based on sine wave modulation and second harmonic detection

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Embodiment Construction

[0030] see figure 1 , figure 2 , image 3 , the device of the present invention comprises a light source, a coupler, a modulator, an optical fiber ring, a D / A and a filter amplifying circuit, a waveform modulation output and a second harmonic detection circuit, an amplifying sampling circuit and a detector, the light source is connected to the coupler, and the coupler is respectively Connect to the detector and modulator, the optical fiber ring is connected to the modulator, the detector is connected to the waveform modulation output and the second harmonic detection circuit after the detector is connected to the waveform modulation output and the second harmonic detection circuit in series, and the waveform modulation output and the second harmonic detection circuit are connected in series with D / A and filtering After the amplifying circuit is connected to the modulator, the waveform modulation output and the second harmonic detection circuit are sine wave modulation output...

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Abstract

The invention discloses an optical fiber ring eigen frequency measurement device and method based on sine wave modulation and second harmonic detection. According to the optical fiber ring eigen frequency measurement device and method, modulation is applied to by adopting a sine wave, and a second harmonic amplitude in an output signal is interfered through detecting an optical fiber ring, thus an eigen frequency is measured. The optical fiber ring eigen frequency measurement device has the technical effect that the modulation is applied by using the sine wave instead of a square wave, multiple defects caused by modulation of the square wave are overcome, the amplitude of the second harmonic of the output signal is detected, and high signal to noise ratio can be obtained by adopting a correlation detection technology.

Description

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Claims

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Application Information

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Owner NAT UNIV OF DEFENSE TECH
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