Temperature Dependence of Mode Coupling in low-NA Plastic Optical Fibers

Savović, Svetislav; Kovačević, Milan; Bajić, Jovan S.; Stupar, Dragan Z.; Djordjevich, Alexandar; Živanov, M.; Drljača, Branko; Simović, Ana; Oh, Kyunghwan

doi:10.1109/jlt.2014.2375515

Cited by 17 publications

(18 citation statements)

References 21 publications

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“…Before any further analysis, the Nyquist imaging criterion for speckle imaging was verified to ensure that there were at least 2 pixels for each one-dimensional speckle [31,32]. Here we defined the pixel with the highest intensity among all other pixels in a speckle as the local intensity maxima of this speckle.…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…The speckle field was sectioned into subimages corresponding to the filtering window sizes of a)16×16, b)32×32, c)64×64, d)128×128, e) 256×256, and f) 1024×1280. The signal waveforms with the largest Ipp were given for, a) sub-image(32,35), b) sub-image(18,18), c) sub-image (9,9), d) sub-image (5,5), e) sub-image(3,3), and f) the whole image. For each sectioning window, the total intensities of 1000 frames were firstly calculated to obtain the waveforms and the Ipp values.…”

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confidence: 99%

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Investigation on sensitivity enhancement for optical fiber speckle sensors

et al. 2016

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We present a detailed theoretical and experimental study on the sensitivity enhancement for multimode fiber (MMF) speckle sensor. Using mode coupling theory, we derive an expression showing that the sensitivity of the MMF speckle sensor depends on the intensity profile of the MMF modes. Particularly, we use our theory to study the influence of the spatial filtering window on the sensitivity, and the experimental results have found a good agreement with the theory. Our results suggest that the sensitivity of an MMF speckle sensor can be greatly enhanced by adjusting the size and location of the spatial filtering window. An 80-fold improvement on sensitivity was achieved in our experiment, as compared with the conventional MMF speckle sensor with the filtering window placed at the center of the speckle field.

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Section: Experiments and Resultsmentioning

confidence: 99%

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confidence: 99%

Investigation on sensitivity enhancement for optical fiber speckle sensors

et al. 2016

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“…The mode coupling in large core multimode fiber has attracted much interest, as it determines a variety of important parameters such as the transmission bandwidth and the loss in fiber communication systems 3, 4 . However, because of the excessive number of modes involved, it is challenging to obtain the exact solutions of all the modes within the large core fiber to implement the field coupling model or power coupling model 5 for mode coupling research.…”

Section: Introductionmentioning

confidence: 99%

“…Large core multimode fiber (MMF) offers the benefits such as a large light-coupling tolerance, easy installation and handling, convenient integration with low cost optoelectronics, and efficient delivery of high power light without inducing strong nonlinear effects 1 , 2 . The mode coupling in large core multimode fiber has attracted much interest, as it determines a variety of important parameters such as the transmission bandwidth and the loss in fiber communication systems 3 , 4 . However, because of the excessive number of modes involved, it is challenging to obtain the exact solutions of all the modes within the large core fiber to implement the field coupling model or power coupling model 5 for mode coupling research.…”

Section: Introductionmentioning

confidence: 99%

“…However, because of the excessive number of modes involved, it is challenging to obtain the exact solutions of all the modes within the large core fiber to implement the field coupling model or power coupling model 5 for mode coupling research. Power-flow model, as an approximation approach, was developed to study the mode coupling within a large core multimode fiber and has found many applications in optical fiber communications 2 – 4 , 6 – 8 . However, previous research paid little attention to the influence of external perturbations on the power flow among modes in a multimode fiber, which should be an important consideration.…”

Section: Introductionmentioning

confidence: 99%

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Power Flow in a Large-Core Multimode Fiber under External Perturbation and its Applications

Qian

Yang

Zhong

et al. 2017

Sci Rep

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Large core optical multimode fiber provides benefits such as a large light-coupling tolerance, easy handling, and delivery of higher light power without undesirable nonlinear effects. In this research, we exploit the effects of external perturbation on the power flow within the large core fiber and present two relevant applications, namely a perturbation sensor and a doughnut beam tuner. Since conventional multimode fiber power flow model does not take into consideration the perturbation effect, we modify the power flow model so that the influence of time varying perturbation can be theoretically analyzed. Based on our theory, we further conduct the numerical simulation and experiments on these two applications. For the fiber vibration sensor, the proposed numerical model shows that the sensor sensitivity depends on the intensity profile of the launched beam and also the higher-order harmonics that were not reported previously can become interferences to affect the signal. For the beam tuner application, we prove both theoretically and experimentally that the doughnut intensity profile at the fiber output can be tuned in real-time by applying external perturbations to the fiber. We expect that the results can be useful to further exploit the external perturbation on large core fiber in various applications.

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Langevin Equation Approach to Mode Coupling in Heated Step-Index Plastic Optical Fibers

Savović

Djordjevich

2021

J Russ Laser Res

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Temperature Dependence of Mode Coupling in low-NA Plastic Optical Fibers

Cited by 17 publications

References 21 publications

Investigation on sensitivity enhancement for optical fiber speckle sensors

Investigation on sensitivity enhancement for optical fiber speckle sensors

Power Flow in a Large-Core Multimode Fiber under External Perturbation and its Applications

Langevin Equation Approach to Mode Coupling in Heated Step-Index Plastic Optical Fibers

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