Abstract
In this paper, we report some results about the effects of varying the wavelength in a structure of a non-holographic fiber specklegram sensor. In these arrangements, the speckle pattern produced by a multi-mode optical fiber is coupled to the asingle-mode optical fiber with lower numerical aperture, which produces a filtering effect that can be used as an optical transduction mechanism. The influence of the wavelength on the sensor performance is evaluated by changing the laser wavelength, and a strong effect on the linearity and reproducibility of its response is found. Lasers emitting at 1310 nm, 1550 nm, and 1625 nm are used.
Highlights
When laser radiation is launched in a multimode optical fiber, at the output end of the fiber a complex speckle pattern appears, which is known as modal noise in optical communication systems, and it is an undesired effect on data transmission [1]
We explored an fiber specklegram sensor (FSS) based on optical power detection for monitoring high frequency mechanical disturbances and demonstrated that the numerical aperture of the multimode optical fiber has a strong effect on the reproducibility of the mechanical perturbations, i.e., the near field speckle size has a strong effect on the metrological characteristics of the non-holographic FSS
As the speckle size generated in the multimode fiber depends directly on the wavelength, in this work, we explored the effects of changing the operation wavelength of the sensor, which consequentially, modified the geometric characteristics of the fiber speckle pattern
Summary
When laser radiation is launched in a multimode optical fiber, at the output end of the fiber a complex speckle pattern appears, which is known as modal noise in optical communication systems, and it is an undesired effect on data transmission [1]. We explored an FSS based on optical power detection for monitoring high frequency mechanical disturbances and demonstrated that the numerical aperture of the multimode optical fiber has a strong effect on the reproducibility of the mechanical perturbations, i.e., the near field speckle size has a strong effect on the metrological characteristics of the non-holographic FSS. The. Photonic Sensors mechanism to explain the metrological effects, is based on an increase in the average speckle size of the speckle pattern generated at the output of a multimode fiber, which increases when the numerical aperture of the multimode fiber decreases [4]. An increase in the sensor linearity response was observed for higher wavelengths
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