Spatial power spectrum characteristics of the core diameter of furnace drawn and laser drawn step-index optical fibers

1981 ◽  
Vol 20 (16) ◽  
pp. 2856 ◽  
Author(s):  
L. S. Watkins ◽  
P. H. Krawarik
Keyword(s):  
Power Spectrum ◽  
Optical Fibers ◽  
Core Diameter ◽  
Step Index ◽  
The Core ◽  
Spectrum Characteristics ◽  
Spatial Power Spectrum

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.

Graded-Index and Single-Mode Polymer Optical Fibers

1992 ◽  
Vol 247 ◽  
Author(s):  
Yasuhiro Koike
Keyword(s):  
Mechanical Properties ◽  
Optical Fibers ◽  
Single Mode ◽  
Polymer Optical Fiber ◽  
Core Diameter ◽  
Graded Index ◽  
The Core ◽  
High Bandwidth ◽  
Polymer Optical Fibers ◽  
First Time

ABSTRACTHigh-bandwidth graded-index (GI) polymer optical fiber (POF) and single-mode POF with good mechanical properties were successfully obtained by our interfacial-gel polymerization technique. The bandwidth of the GI POF is about 1 GHz · km which is two hundred times larger than that of the conventional step-index (SI) POF. The minimum attenuation of transmission is 56 dB/km at 688-nm wavelength and 94 dB/km at 780-nm wavelength. The single-mode POF in which the core diameter was 3–15 μ m and the attenuation of transmission was 200 dB/km at 652-nm wavelength was successfully obtained for the first time.

High speed measurement of the core diameter of a step-index optical fiber

1980 ◽  
Vol 19 (22) ◽  
pp. 3756 ◽  
Author(s):  
L. S. Watkins ◽  
R. E. Frazee
Keyword(s):  
Optical Fiber ◽  
High Speed ◽  
Core Diameter ◽  
Step Index ◽  
The Core ◽  
Speed Measurement

Study of Wavelength-Dependent Bend Loss in Step-Index Multimode Fiber-Optic Microbend Displacement Sensor

2017 ◽  
Vol 6 (1) ◽  
pp. 13-21 ◽  
Author(s):  
Sami D. Alaruri
Keyword(s):  
Optical Fibers ◽  
Fiber Optic ◽  
Transmission Loss ◽  
Wavelength Dependence ◽  
Fused Silica ◽  
Displacement Sensor ◽  
Sensor Output ◽  
Bend Radius ◽  
Core Diameter ◽  
Step Index

In this article, 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 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.

scholarly journals A note on two expressions for the spatial power spectrum of the geomagnetic field

1996 ◽  
Vol 39 (3) ◽  
Author(s):  
A. De Santis ◽  
D. R. Barraclough
Keyword(s):  
Power Spectrum ◽  
Power Law ◽  
Geomagnetic Field ◽  
Core Radius ◽  
Spherical Harmonic Degree ◽  
The Core ◽  
A Value ◽  
First Case ◽  
Spatial Power Spectrum ◽  
Harmonic Degree

The spatial power spectrum of the geomagnetic field is usually assumed to be exponential in the spherical harmonic degree (n). An equally valid assumption, however, is that the spectrum at the surface of the Earth's core has a power-law dependence on n. Some implications of these two assumptions are discussed, noting that, in the first case, a value for the core radius can be derived from the slope of the spectrum and, in the second, that the spectrum for radii greater than the radius of the core is a mixture of the exponential and power-law types.

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