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 Study of Macrobending Losses Effect in Plastic Optical Fibber.

2016 ◽  
Vol 4 (01) ◽  
pp. 43
Author(s):  
Egyn Furqon Ghozali ◽  
Mohtar Yunianto ◽  
Nuryani N
Keyword(s):  
Experimental Study ◽  
Light Intensity ◽  
Optical Fiber ◽  
Light Source ◽  
Optical Fibers ◽  
Personal Computer ◽  
Plastic Optical Fiber ◽  
Model Based

<span>Experimental study to analyze the effect of macrobending losses in plastic optical fiber triple bending <span>model based on PC (personal computer) has been conducted. The data is gathered by measuring the <span>change of the light intensity due to the presence of bending on optical fibers. The bending causes losses <span>of optical fiber that is read by WIM (weight in motion) Acquisition program based on Borlan Delphi 7. <span>The optical fibers are plastic with diameter of 3 mm. The diameter of pin is 8 mm and the space between <span>the pin is 5 mm. The light source is a LED (<span><em>λ</em><span>=676 nm). As a result, the losses of optical fiber increase <span>with the enhancement of bending. The increase trend linear to sensitivity of the sensor with gradient of <span>0,1063 and <span><em>R</em><span>2 <span>of 0,9626. Therefore, the proposed design might be applied as a WIM sensor.</span></span></span></span></span></span></span><br /></span></span></span></span></span></span>

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.

16Gbit/ s radio OFDM signals over graded-index plastic optical fiber

2008 ◽  
Author(s):  
Jianjun Yu ◽  
Dayou Qian ◽  
Mingfang Huang ◽  
Zhensheng Jia ◽  
Gee Kung Chang ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Plastic Optical Fiber ◽  
Graded Index ◽  
Ofdm Signals

Imaging Spectroscopy Using Fiber Optics

1997 ◽  
Vol 3 (S2) ◽  
pp. 845-846
Author(s):  
S. Michael Angel ◽  
H. Trey Skinner ◽  
Brian J. Marquardt
Keyword(s):  
Optical Fiber ◽  
Fiber Optics ◽  
Optical Fibers ◽  
Fiber Optic ◽  
Imaging System ◽  
Single Point ◽  
Imaging Spectroscopy ◽  
Small Diameter ◽  
Imaging Spectrometer ◽  
Remote Spectroscopy

Optical fiber probes are routinely used with optical spectrometers to allow measurements to be made on remotely located samples. In most of these systems, however, the optical fibers are used as non-imaging “light pipes” for the transmission of laser light, and luminescence or Raman signals to and from the sample. Thus, while these systems are suitable for remote spectroscopy, they are limited to single-point measurements. In a recent paper, we showed that a small-diameter (i.e., 350 μm) coherent optical fiber bundle can be combined with an AOTF-based imaging spectrometer for fluorescence and Raman spectral micro-imaging with increased flexibility in terms of sample positioning and in-situ capabilities. The previous paper described the operation of the fiber-optic microimaging probe and AOTF imaging system and showed preliminary Raman and fluorescence images for model compounds with 4 μm resolution. We have extended this work to include a discussion of the lateral and vertical spatial resolution of the fiber-optic microprobe in a non-contact proximity-focused configuration.

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.

Sign in / Sign up

Export Citation Format

Share Document