&lt;title&gt;Design and performance of the asymmetrical coupler of plastic optical fibers&lt;/title&gt;

Kruszewski, Jerzy; Borecki, M.; Bebłowska, Maria

doi:10.1117/12.581750

Cited by 3 publications

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“…The core of this fiber has a diameter of 750μm and its allowable radius of repeatable bend is 40mm. The variation of the light transmission coefficient of a fiber bend in the form of a half-circle as a function of the curvature radius is shown in Figure 5 , [ 13 ].…”

Section: Design Of Sensor Optical Pathmentioning

confidence: 99%

“…However the curvature radius of the arms of the proposed coupler must exceed 30mm so as to fulfill the small insertion loss condition. The light intensity patterns at the tip of the fiber core cross-section for deformations by “half of the ring” and “one fourth of the ring” are illustrated in the Figure 6 , [ 13 ].…”

Section: Design Of Sensor Optical Pathmentioning

confidence: 99%

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Intelligent Fiber Optic Sensor for Estimating the Concentration of a Mixture-Design and Working Principle

Borecki

2007

Sensors

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This paper presents the construction and working principles of an intelligent fiber-optic intensity sensor used for examining the concentration of a mixture in conjunction with water. It can find applications e.g. in waste-water treatment plant for selection of a treatment process. The sensor head is the end of a large core polymer optical fiber, which constitutes one arm of an asymmetrical coupler. The head works on the reflection intensity basis. The reflected signal level depends on the Fresnel reflection from the air and from the mixture examined when the head is immersed in it. The sensor head is mounted on a lift. For detection purposes the signal can be measured on head submerging, submersion, emerging and emergence. Therefore, the measured signal depends on the surface tension, viscosity, turbidity and refraction coefficient of the solution. The signal coming from the head is processed electrically in an opto-electronic interface. Then it is fed to a neural network. The novelty of the proposed sensor lies in that it contains an asymmetrical coupler and a neural network that works in the generalization mode. The sensor resolution depends on the efficiency of the asymmetrical coupler, the precision of the opto-electronic signal conversion and the learning accuracy of the neural network. Therefore, the number and quality of the points used for the learning process is very important. By way of example, the paper describes a sensor intended for examining the concentration of liquid soap in water.

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Section: Design Of Sensor Optical Pathmentioning

confidence: 99%

Section: Design Of Sensor Optical Pathmentioning

confidence: 99%

Intelligent Fiber Optic Sensor for Estimating the Concentration of a Mixture-Design and Working Principle

Borecki

2007

Sensors

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“…In this context, multi-port couplers are key elements to implement different layouts that require combining or splitting optical signals, whereas similar designs are needed for sensor applications and for power monitoring in network management and testing [1][2][3]. Thus, depending on their function, several coupler designs based on different technologies have been developed: waveguide plates, injection molding, fused-tapered, thermally bended/glued or misaligned fibers and beam-splitter cubes [4][5][6][7][8]. The main issue when these devices are introduced in a POF link is that they can modify the fiber modal power distribution, changing the transmission performance so that it is necessary to assess and quantify their impact [9].…”

Section: Introductionmentioning

confidence: 99%

Characterization of a Y-Coupler and Its Impact on the Performance of Plastic Optical Fiber Links

López¹,

Losada

Mateo

et al. 2018

Fibers

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Couplers and splitters are common devices in single-mode and multi-mode glass fibers applications, where they perform a variety of functions. However, when switching to plastic optical fibers (POFs), there is a shortage of commercial devices, which are usually custom-made. The problem with these devices is that modal power distribution in POFs is easily modified by spatial disturbances that produce a localized strong power transfer between modes, thus changing their transmission properties. In this work, a commercial Y-coupler designed for POFs is experimentally characterized. Measurements of its spectral, spatial and temporal characteristics have been performed, including insertion loss as a function of wavelength, angular power distribution, and frequency response. The obtained results show that this device has an equalizing effect over the power spatial distribution that reduces the fiber bandwidth, demonstrating the importance of considering the impact of this type of devices on the transmission properties of any POF system.

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Optical performance of symmetrical and asymmetrical Y-branch couplers for plastic optical fibers

Kuang

Chen

2012

Appl. Opt.

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The excess loss and output optical power ratio of symmetrical and asymmetrical Y-branch couplers for plastic optical fibers (POFs) are studied in this work. A ray-tracing model for the Y-branch coupler is derived to investigate the effect of coupling parameters on its optical performance. The coupling parameters, namely coupling angle, axial displacement, and refractive index of filling medium between the emitting-end and receiving-end POFs, are studied. The simulated and measured results indicate that the coupling efficiency is sensitive to all these coupling parameters. A minimum excess loss of approximately 0.83 dB is observed for the symmetrical Y-branch coupler. It is found that both the excess loss and the output power ratio are increased with the increase of the refractive index of the filling medium and the total coupling angle (α+β) for the asymmetrical Y-branch coupler. The experimental results indicate that the maximum output power ratio P1∶P2 is found to be 3.8∶1 for excess loss of less than 2.8 dB for the asymmetrical Y-branch coupler.

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<title>Design and performance of the asymmetrical coupler of plastic optical fibers</title>

Cited by 3 publications

References 0 publications

Intelligent Fiber Optic Sensor for Estimating the Concentration of a Mixture-Design and Working Principle

Intelligent Fiber Optic Sensor for Estimating the Concentration of a Mixture-Design and Working Principle

Characterization of a Y-Coupler and Its Impact on the Performance of Plastic Optical Fiber Links

Optical performance of symmetrical and asymmetrical Y-branch couplers for plastic optical fibers

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