Estimation of long-term transmission loss increase in silica-based optical fibers under hydrogen atmosphere

1988 ◽  
Vol 6 (2) ◽  
pp. 218-225 ◽  
Author(s):  
M. Kuwazuru ◽  
Y. Namihira ◽  
K. Mochizuki ◽  
Y. Iwamoto
Keyword(s):  
Optical Fibers ◽  
Transmission Loss ◽  
Hydrogen Atmosphere

A Step-Index Multimode Fiber-Optic Microbend Displacement Sensor Wavelength Dependent Loss

2019 ◽  
pp. 47-60
Author(s):  
Sami D. Alaruri
Keyword(s):  
Optical Fibers ◽  
Fiber Optic ◽  
Transmission Loss ◽  
Wavelength Dependence ◽  
Fiber Optic Sensors ◽  
Fused Silica ◽  
Displacement Sensor ◽  
Sensor Output ◽  
Core Diameter ◽  
Step Index

In this chapter, the wavelength dependence of bend loss in a step-index multimode optical fiber (100 µm core diameter; fused silica) was investigated for fiber bend radii ranging between 2.0 and 4.5 mm using six laser excitation wavelengths, namely, 337.1, 470, 590, 632.8, 750, and 810 nm. The results obtained from fitting the bend loss measurements to Kao's model and utilizing MATLAB® indicate that bend loss is wavelength dependent and transmission loss in multimode optical fibers increases with the decrease in the fiber bend radius. Furthermore, the response of a microbend fiber-optic displacement sensor was characterized at 337.1, 470, 632.8, 750, and 810 nm. Measurements obtained from the microbend sensor indicate that the sensor output power is linear with the applied displacement and the sensor output is wavelength dependent. Lastly, references for industrial and biomedical applications of microbend fiber-optic sensors are provided. Finally, a brief description for the transmission loss mechanisms in optical fibers is given.

Measurement equipment for long-term testing of polymer optical fibers

2002 ◽  
Author(s):  
B. Guenther ◽  
Wolf Czepluch ◽  
Werner Daum ◽  
Karl-Friedrich Klein ◽  
Hans Poisel ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Measurement Equipment ◽  
Polymer Optical Fibers

Effects of the Weak Absorption Tail on the Transmission Loss of Ge-Sb-Se Optical Fibers

2005 ◽  
Vol 88 (5) ◽  
pp. 1205-1208 ◽  
Author(s):  
Woon Jin Chung ◽  
Bong Je Park ◽  
Hong Seok Seo ◽  
Joon Tae Ahn ◽  
Myung-Hyun Lee ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Transmission Loss ◽  
Weak Absorption ◽  
Absorption Tail

Biomimetic model of a sponge-spicular optical fiber—mechanical properties and structure

2001 ◽  
Vol 16 (5) ◽  
pp. 1420-1428 ◽  
Author(s):  
M. Sarikaya ◽  
H. Fong ◽  
N. Sunderland ◽  
B. D. Flinn ◽  
G. Mayer ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Optical Fibers ◽  
Circular Cross Section ◽  
Fused Silica ◽  
Atomic Force ◽  
Commercial Glass ◽  
Bend Tests ◽  
Point Bend ◽  
Thick Layers

Nanomechanical properties, nanohardness and elastic modulus, of an Antarctic sponge Rosella racovitzea were determined by using a vertical indentation system attached to an atomic force microscope. The Rosella spicules, known to have optical waveguide properties, are 10–20 cm long with a circular cross section of diameter 200–600 μm. The spicules are composed of 2–10-μm-thick layers of siliceous material that has no detectable crystallinity. Measurements through the thickness of the spicules indicated uniform properties regardless of layering. Both the elastic modulus and nanohardness values of the spicules are about half of that of either fused silica or commercial glass optical fibers. The fracture strength and fracture energy of the spicules, determined by 3-point bend tests, are several times those of silica rods of similar diameter. These sponge spicules are highly flexible and tough possibly because of their layered structure and hydrated nature of the silica. The spicules offer bioinspired lessons for potential biomimetic design of optical fibers with long-term durability that could potentially be fabricated at room temperature in aqueous solutions.

scholarly journals How the optical timing system, the longitudinal diagnostics and the associated feedback systems provide femtosecond stable operation at the FERMI free electron laser

2016 ◽  
Vol 4 ◽  
Author(s):  
Mario Ferianis ◽  
Enrico Allaria ◽  
Eugenio Ferrari ◽  
Giulio Gaio ◽  
Giuseppe Penco ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Free Electron ◽  
Free Electron Laser ◽  
Bunch Length ◽  
Stable Phase ◽  
Stable Operation ◽  
Feedback Systems ◽  
Sensors And Actuators ◽  
Timing System

FERMI, the seeded free electron laser (FEL) in operation in Italy, is providing the User Community with unique fully coherent radiation, in the wavelength range 100–4 nm. FERMI is the first FEL fully synchronized by means of optical fibers. The optical timing system ensures an ultra-stable phase reference to its distributed clients. Several femtosecond longitudinal diagnostics verify the achieved performance; the bunch length monitor (BLM) and the bunch arrival monitor (BAM) will be presented in this paper. Feedback systems play a crucial role to guarantee the needed long-term electron beam stability. A real-time infrastructure allows shot-to-shot communication between front-end computers and the servers. Orbit feedbacks are useful in machine tuning, whereas longitudinal feedbacks control electron energy, compression and arrival time. A flexible software framework allows a rapid implementation of heterogeneous multi-input–multi-output (MIMO) longitudinal loops simply by selecting the appropriate sensors and actuators.

Long-term reliability of transmission loss in optical fiber cables

1988 ◽  
Vol 6 (2) ◽  
pp. 210-217 ◽  
Author(s):  
S. Tanaka ◽  
M. Honjo
Keyword(s):  
Optical Fiber ◽  
Transmission Loss
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