Fabrication of Lensed Plastic Optical Fiber Array Using Electrostatic Force

2011 ◽  
Vol 133 (3) ◽  
Author(s):  
Yih-Tun Tseng ◽  
Jhong-Bin Huang ◽  
Che-Hsin Lin ◽  
Chin-Lung Chen ◽  
Wood-Hi Cheng
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Electrostatic Force ◽  
Coupling Efficiency ◽  
Numerical Aperture ◽  
Uv Curing ◽  
Power Budget ◽  
Fiber Array ◽  
Plastic Optical Fibers ◽  
Efficient Coupling

The GI (graded-index) POFs (Plastic optical fibers), which has been proven to reach distances as long as 1 km at 1.25 Gb/s has a relatively low numerical aperture . Therefore, the efficient coupling of GI POFs to the light source has become critical to the power budget in the system. Efficient coupling for a POFs system normally involves either a separate lens or the direct formation of the lens at the end of the fiber. Forming the lens-like structure directly on the fiber end is preferred for simplicity of fabrication and packaging, such as polishing and fusion, combine different fibers with the cascaded fiber method and hydroflouride (HF) chemical etching. These approaches are well established, but applicable only to glass. Optical assembly architecture for multichannel fibers and optical devices is critical to optical fiber interconnections. Multichannel fiber-pigtail laser diode (LD) modules have potential for supporting higher data throughput and longer transmission distances. However, to be of practical use, these modules must be more precise. This work proposes and manufactures lensed plastic optical fibers (LPOF) array. This novel manipulation can be utilized to fabricate an aspherical lens on a fiber array after the UV curing of the photo-sensitive polymer; the coupling efficiency (CE) is increased and exceeds 47% between the LD array and the fiber array.

scholarly journals Shaping Beam Profiles Using Plastic Optical Fiber Tapers with Application to Ice Sensors

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2503
Author(s):  
Kostas Amoiropoulos ◽  
Georgia Kioselaki ◽  
Nikolaos Kourkoumelis ◽  
Aris Ikiades
Keyword(s):  
Fiber Optics ◽  
Optical Fibers ◽  
Laser Cooling ◽  
Detection Efficiency ◽  
Numerical Aperture ◽  
Beam Profile ◽  
Hollow Beam ◽  
Enhanced Sensitivity ◽  
Surface Irregularities ◽  
Plastic Optical Fibers

Using either bulk or fiber optics the profile of laser beams can be altered from Gaussian to top-hat or hollow beams allowing enhanced performance in applications like laser cooling, optical trapping, and fiber sensing. Here, we report a method based on multimode Plastic Optical Fibers (POF) long-tapers, to tweak the beam profile from near Gaussian to a hollow beam, by generating surface irregularities on the conical sections of the taper with a heat-and-pull technique. Furthermore, a cutback technique applied on long tapers expanded the output beam profile by more than twice the numerical aperture (NA) of the fiber. The enhanced sensitivity and detection efficiency of the extended profile was tested on a fiber optical ice sensor related to aviation safety.

scholarly journals An Analytical Model for Describing the Power Coupling Ratio between Multimode Fibers with Transverse Displacement and Angular Misalignment in an Optical Fiber Bend Sensor

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 4968
Author(s):  
Wern Kam ◽  
Yong Sheng Ong ◽  
Sinead O’Keeffe ◽  
Waleed S. Mohammed ◽  
Elfed Lewis
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Theoretical Calculations ◽  
Optical Fiber Sensor ◽  
Coupling Efficiency ◽  
Transverse Displacement ◽  
Coupling Ratio ◽  
Angular Misalignment ◽  
Multimode Fibers ◽  
Power Coupling

The power coupling ratio between step-index multimode fibers caused by combined transversal and angular misalignment is calculated. A theoretical description of the coupling efficiency between two optical fibers based on geometrical optics is provided. The theoretical calculations are collaborated by experiments, determining the power coupling ratio between three output fibers with an axial offset and angular misalignment with a single input fiber. The calculation results are in good agreement with experimental results obtained using a previously fabricated optical fiber sensor for monitoring physiological parameters in clinical environments. The theoretical results are particularly beneficial for optimizing the design of optical fiber bending sensors that are based on power coupling loss (intensity) as the measurement interrogation requires either axial displacement, angular misalignment, or both.

Lensed Plastic Optical Fiber with a Convexo-Concave Fiber Endface for Coupling Laser Diodes With Plastic Optical Fiber

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
Yih-Tun Tseng ◽  
Shu-Ming Chang ◽  
Sheng-He Huang ◽  
Wood-Hi Cheng
Keyword(s):  
Optical Fiber ◽  
Light Source ◽  
Optical Fibers ◽  
Transmission Rate ◽  
Coupling Efficiency ◽  
Small Diameter ◽  
Plastic Optical Fiber ◽  
Graded Index ◽  
Coupling Laser ◽  
Working Distance

This work presents a novel lensed plastic optical fiber (POF), efficiently coupled with a light source. A convexo-concave plastic lens (CCPL) was bound to a flat-end plastic optical fiber using laser transmission welding (LTW) to form a convexo-concave-shaped fiber endface (CCSFE). The novel lensed plastic optical fiber has a longer working distance and a higher coupling efficiency than conventional lensed plastic optical fibers. 850 nm fiber is often used in high-power 2.5 Gb/s transmission rate. Experimental POF is perfluorinated POF, 62.5–500 μm diameter, 850∼1300 μm wavelength, 10 dB/km power loss rate, 2.5 Gb/s transmission rate. Because of the small diameter of POF, it is difficult to couple between the light source and POF. Therefore, it is important to develop a lensed fiber structure to increase the coupling efficiency. Experiments indicate that the coupling efficiency between a laser diode at a wavelength of 850 nm and a graded-index POF is as high as 85% with a long working distance of 250 μm. The measured tolerance, in relation to the lateral and vertical displacements and tilt, are satisfactory for practical active alignment.

scholarly journals Исследование оптических свойств многомодового кварцевого оптического волокна с отражающей оболочкой из фторированного термопластичного полимера

2019 ◽  
Vol 127 (9) ◽  
pp. 477
Author(s):  
А.А. Маковецкий ◽  
А.А. Замятин ◽  
Д.В. Ряховский
Keyword(s):  
Optical Properties ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Scattered Radiation ◽  
Fiber Length ◽  
Numerical Aperture ◽  
Optical Losses ◽  
Laser Medicine ◽  
Propagation Of Light ◽  
Absorption Of Light

Optical properties silica - polymeric optical fiber with a core with a diameter of 430 microns and the reflecting cover 70 microns thick from thermoplastic copolymer of a tetraftoretilen with ethylene (Tefzel brand) are experimentally investigated. The polymeric cover is applied on silica fiber with applicator from polimer melt directly on drowing tower. Optical losses of the fiber, a numerical aperture and its dependence on fiber length are measured. It is established that at propagation of light in fiber its noticeable scattering is observed. It is connected with crystallinity of polymeric cover. Distribution of intensity of scattered radiation along an axis of fiber and an indicatrix of dispersion of radiation by a coating are measured. Relative deposits of dispersion and absorption of light in a cover at the general optical losses of fiber are estimated. The possibility of use of optical fibers of this structure in laser medicine is considered.

Plastics and Polymers for Optical Transmission

1986 ◽  
Vol 88 ◽  
Author(s):  
L. L. Blyler ◽  
K. A. Cogan ◽  
J. A. Ferrara
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Optical Transmission ◽  
Optical Fiber Sensors ◽  
Optical Polymers ◽  
Optical Components ◽  
Fiber Sensors ◽  
Non Linear ◽  
Plastic Optical Fibers ◽  
Linear Optical

ABSTRACTThe current stktus of worldwide research in the use of polymers as active lightwave transmission media is examined. Applications include plastic optical fibers, plastic optical components, polymeric optical fiber sensors and non-linear optical polymers.

Controlled-Pore Glasses Embedded in Plastic Optical Fibers for Gastric pH Sensing Purposes

1994 ◽  
Vol 48 (5) ◽  
pp. 549-552 ◽  
Author(s):  
F. Baldini ◽  
S. Bracci ◽  
F. Cosi ◽  
P. Bechi ◽  
F. Pucciani
Keyword(s):  
Optical Fibers ◽  
Detection System ◽  
Ph Sensor ◽  
Coupling Efficiency ◽  
Fast Response ◽  
Bromophenol Blue ◽  
Ph Sensing ◽  
Core Diameter ◽  
Plastic Optical Fibers

The present work is concerned with the development of an optical-fiber pH sensor for gastric monitoring. Bromophenol blue is used as a chromophore, which is immobilized on controlled-pore glasses (CPGs) by means of a silylation process. As far as the optoelectronic unit is concerned, light-emitting diodes as sources and an appropriate electronic circuit as detection system are utilized. Treated CPGs are fixed at the end of two plastic optical fibers (core diameter = 500 μm) by means of a proprietary process; a reflector made of Teflon®, anchored to the distal end of the fibers, ensures good fibers/probe coupling efficiency. The behavior of the realized probe is carefully investigated, with particular attention devoted to the presence of hysteresis, to ionic strength and temperature effect, and to its lifetime. The fast response time, thanks to the absence of a mechanical envelope, the small dimensions of the probe, and the biocompatibility of the utilized materials make this sensor suitable for in vivo measurements.

Flex Fatigue of Side Emitting Optical Fiber

2013 ◽  
Vol 683 ◽  
pp. 425-430 ◽  
Author(s):  
Juan Huang ◽  
Dana Kremenakova ◽  
Jiří Militký
Keyword(s):  
Optical Fiber ◽  
Weibull Distribution ◽  
Optical Fibers ◽  
Mechanical Deformation ◽  
Significant Characteristic ◽  
Plastic Optical Fibers ◽  
Different Diameters ◽  
The Relationship

Side emitting plastic optical fibers can be used in textile structures for some special optical activities due to the light leaking out from their surface. One significant characteristic of plastic optical fibers is their tendency to weaken side emitting capability under mechanical deformation, which can be simulated as repeated bending cycles under prescribed pretension. The principle of evaluation of flex fatigue was based on the repeated bending cycles until break. Q-Q plot and three-parameter Weibull distribution were used for estimation of numbers of bending cycles of plastic optical fibers with different diameters. The relationship between flex fatigue and flexibility were analyzed and compared with logarithmic values.

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