Wavelength Drift of PMMA-Based Optical Fiber Bragg Grating Induced by Optical Absorption

Zhang, W.; Abang, Ada; Webb, David J.; Peng, Gang-Ding

doi:10.1109/lpt.2014.2371066

Cited by 7 publications

(5 citation statements)

References 13 publications

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“…This effect is huge because of the elevated annealing temperature [15][16]. Zhang et al [8] also studied the effect of RH on the wavelength drift of PMMA-based POFBGs, but this mechanism was caused by the optical absorption increasing with RH, which led to an increase in internal temperature due to photothermal effect.…”

Section: Digital Object Identifier Xxxxmentioning

confidence: 99%

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Solution-Mediated Annealing of Polymer Optical Fiber Bragg Gratings at Room Temperature

Fasano¹,

Woyessa²,

Janting³

et al. 2017

IEEE Photon. Technol. Lett.

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In this letter we investigate the response of poly(methyl methacrylate) (PMMA) microstructured polymer optical fiber Bragg gratings (POFBGs) after immersion in methanol/water solutions at room temperature. As the glass transition temperature of solution-equilibrated PMMA differs from the one of solvent-free PMMA, different concentrations of methanol and water lead to various degrees of frozen-in stress relaxation in the fiber. After solvent evaporation, we observe a permanent blue-shift in the grating resonance wavelength. The main contribution in the resonance wavelength shift arises from a permanent change in the size of the fiber. The results are compared with conventional annealing. The proposed methodology is cost-effective as it does not require a climate chamber. Furthermore, it enables an easy-to-control tuning of the resonance wavelength of POFBGs.

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Section: Digital Object Identifier Xxxxmentioning

confidence: 99%

“…[1][2]. Poly(methyl methacrylate) (PMMA) is the most common material for polymer optical fiber Bragg gratings (POFBGs) [6][7][8]. Getinet Woyessa, Jakob Janting, and Ole Bang are with the Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kgs.…”

Section: Introductionmentioning

confidence: 99%

Solution-Mediated Annealing of Polymer Optical Fiber Bragg Gratings at Room Temperature

Fasano¹,

Woyessa²,

Janting³

et al. 2017

IEEE Photon. Technol. Lett.

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“…The non-toxic of light-guided medium is also necessary requirement in our experiments. Thus we choose a surface-lighting plastic optical fiber (POF) [28], [29] as the light-guided medium. The light will penetrate from the inner of POF to outside.…”

Section: B Image Acquirement Methodsmentioning

confidence: 99%

Laparoscopic Image-Guided System Based on Multispectral Imaging for the Ureter Detection

Yu¹,

Song²,

Liu³

et al. 2019

IEEE Access

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The iatrogenic ureter injury is a common medical negligence in the gynecology, abdominal, and urinary surgeries. Anatomically, the ureter is covered by peritoneum and connective tissue, and the doctor cannot observe it directly in surgery. The ureter injury may cause significant complications for patients and medical disputes. It is important to indicate the ureter position for aided surgery of the doctor. To provide ureter position for doctors in the laparoscopic surgery, we design an image-guided endoscope system that includes a novel endoscopic video system with a visible-light camera and an infrared camera. The visible-light camera is to capture the coeliac image and the infrared camera is to capture the ureter position, simultaneously. To extract accurate ureter position in the infrared image, we also propose a self-adaptive threshold segmentation algorithm to extract the real ureter position as accurately as possible. The self-adaptive threshold and scattering factor are taken in to full account for the ureter segmentation. In addition, the scattering property of light is also discussed to choose the optimal light. Finally, we design and develop the image-guided endoscope system, and experiment it on the animal. The experimental results demonstrate that the proposed image-guided endoscope system achieves 93.8% and 90.6% in terms of true positive rate and positive predictive value, respectively. The processing speed of the proposed algorithm can reach about 165 frames per second (f/s), and the frame rate is far faster than the frame rate (30 f/s) of the traditional endoscope system. The accuracy and processing ability of the system can satisfy the clinical demand. The iatrogenic ureter injury may be decreased when the surgeons perform the operations with the ureter position displayed in real time. INDEX TERMSEndoscope system, ureter injury, image-guided, multispectral imaging, ureter detection.

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“…Particularly microstructured POFs (mPOFs) are highly attractive due to flexibility of their design and relatively straightforward fabrication of single mode fibres [9][10][11]. Polymethyl methacrylate (PMMA) was the first polymer used for mPOF fabrication [9,2,3], and still remains the most widely used one [12][13][14][15]. In recent years, mPOFs from different polymers have been developed having similar low-loss properties as PMMA in the visible and near infra-red spectrum.…”

Section: Introductionmentioning

confidence: 99%

Mechanical characterization of drawn Zeonex, Topas, polycarbonate and PMMA microstructured polymer optical fibres

Rasmussen¹,

Fasano²,

Stajanča³

et al. 2018

Opt. Mater. Express

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Wavelength Drift of PMMA-Based Optical Fiber Bragg Grating Induced by Optical Absorption

Cited by 7 publications

References 13 publications

Solution-Mediated Annealing of Polymer Optical Fiber Bragg Gratings at Room Temperature

Solution-Mediated Annealing of Polymer Optical Fiber Bragg Gratings at Room Temperature

Laparoscopic Image-Guided System Based on Multispectral Imaging for the Ureter Detection

Mechanical characterization of drawn Zeonex, Topas, polycarbonate and PMMA microstructured polymer optical fibres

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