scholarly journals Computer Support of Analysis of Optical Spectra Measurements

2021 ◽  
Vol 6 (1) ◽  
pp. 51
Author(s):  
Sandra Pawłowska
Keyword(s):  
Refractive Index ◽  
Light Source ◽  
Optical Fibers ◽  
Measurement Errors ◽  
Optical Spectrum ◽  
Model Fitting ◽  
Single Mode ◽  
Central Peak ◽  
Optical Spectra ◽  
Accuracy Of Measurements

The verification of measurement errors has a big impact on the assessment of the accuracy of conducted measurements and obtained results. In many cases, computer simulation results are compared with measurement results in order to evaluate measurement errors. The purpose of our research was to check the accuracy of measurements made with a Fabry–Perot interferometer working in the transmission mode. In the measurement setup, a 1310 nm superluminescent diode light source, single-mode optical fibers and an optical spectrum analyzer were used. The influence of the length of the resonating cavity and refractive index on the envelope of the optical spectrum was investigated. A program was created that models the envelope of the optical spectrum on the basis of the length of the resonating cavity, the refractive index and the light source output spectral characteristic, which in simulation was assumed to have the shape of Gaussian distribution. After the simulation the program compares the simulated and measured optical spectrum. The comparison of simulated and measured optical spectra proved to be challenging due to the shift in the position of the central peak between the simulated and measured optical spectrum. There are two ways to perform model fitting: by adjusting the position of central peaks or minimums next to the central peak. It was observed that the second solution was more optimal and was implemented in the program.

scholarly journals Macrobending Loss Analysis on Singlemode-Multimode-Singlemode Fiber Optic Core

2019 ◽  
Vol 9 (2) ◽  
pp. 11-15
Author(s):  
Sisca Arisya Harry Andhina
Keyword(s):  
Light Source ◽  
Optical Fibers ◽  
Fiber Optic ◽  
Optical Power ◽  
Single Mode ◽  
Fiber Optic Cable ◽  
Power Meter ◽  
Loss Analysis ◽  
Measurement Results ◽  
Source Test

Macrobending often occurs in optical fibers that embedded in the ground due to shifting of soil or rocks in the ground causing interference in transmission. In this study used single-mode-multimode-singlemode fiber optic cable connected manually and axially measured using a light source test equipment and optical power meter and the results will be compared. The measurement results obtained the greater  value of macrobending losses with the smaller the diameter of the winding, and the greater the number of turns. The highest value of macrobending losses in multimode cables is -1.48dB at 0.5cm diameter with 5 turns, highest value of macrobending losses on single mode cables is -12.73dB at 0.5cm diameter with 5 turns,  lowest value of macrobending losses for multimode cables is -0.44dB at 5cm diameter with 1 twist, lowest macrobending losses in singlemode cables is -1.69dB at 5cm diameter with 1 twist. While the value of macrobending losses on axially connected SMS cables shows the highest value of macrobending losses on multimode cables is -1.12dB in diameter of 0.5cm with 5 turns,  highest value of macrobending losses on singlemode cables is -1.18dB at diameter of 0.5cm with 5 turns,  lowest value for macrobending losses on multimode cables is -0.66dB at 5cm in diameter with 1 twist, the smallest value for macrobending losses on singlemode cables is -0.27dB at 5cm diameter with 1 twist . The measurement results also showed that the macrobending losses of manually connected SMS cables were greater than the macrobending losses of axially connected SMS cables.

Refractive-index profiling of single-mode optical fibers and performs

1979 ◽  
Vol 18 (23) ◽  
pp. 4006 ◽  
Author(s):  
Herman M. Presby ◽  
Dietrich Marcuse ◽  
William G. French
Keyword(s):  
Refractive Index ◽  
Optical Fibers ◽  
Single Mode

The computer application for the mathematical modeling of optical fibers used in metrology

2021 ◽  
Author(s):  
Sławomir Torbus ◽  
Michał Kozakiewicz
Keyword(s):  
Mathematical Modeling ◽  
Refractive Index ◽  
Optical Fibers ◽  
Single Mode ◽  
Computer Application ◽  
Mathematical Formulas

Abstract The article briefly characterizes single mode optical fibers that are not resistant to bending (ITU-T G.652 and G.653) and resistant to bending (ITU-T G.657) and multimode telecommunications optical fibers (ITU-T G.651). The basic mathematical formulas implemented in the application have also been presented, with which the parameters of the designed optical fibers are calculated. The practical part was to create and to test the application enabling the design of single mode and multimode optical fibers of selected refractive index profiles. This paper presents the results of simulations of commonly used telecommunications optical fibers (single mode and multimode). Conclusions regarding the accuracy of calculations performed by the computer application and areas of its applications were formulated.

scholarly journals Dynamics of pump-induced refractive index changes in single-mode Yb-doped optical fibers

2008 ◽  
Vol 16 (17) ◽  
pp. 12658 ◽  
Author(s):  
Andrei A. Fotiadi ◽  
Oleg L. Antipov ◽  
Patrice Mégret
Keyword(s):  
Refractive Index ◽  
Optical Fibers ◽  
Single Mode ◽  
Index Changes

Near-Field Scanning Optical Microscopy Studies of Materials and Devices

MRS Bulletin ◽  
1997 ◽  
Vol 22 (8) ◽  
pp. 27-30 ◽  
Author(s):  
J.W.P. Hsu
Keyword(s):  
Optical Microscopy ◽  
Light Source ◽  
Optical Fibers ◽  
Force Feedback ◽  
Near Field ◽  
Single Mode ◽  
Field Zone ◽  
Research Activities ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

Near-field scanning optical microscopy (NSOM) provides a means to study optical and optoelectronic properties of materials at the nanometer scale. The key to achieving resolution higher than the diffraction limit is to place a subwavelength-sized light source—e.g., an aperture—within the near-field zone of the sample. In this case, the area of the sample illuminated is determined by the aperture size and not by the wavelength (see Figure 1). An image can then be formed by moving the sample and light source with respect to each other. While the principle of near-field optics is straightforward, its realization at visible-light wavelengths was not achieved until the invention of scanning-probe techniques in the 1980s. Since Betzig et al. demonstrated in 1991 that bright subwavelength apertures can be made by tapering and metal-coating single-mode optical fibers, research activities involving NSOM have increased tremendously. The later incorporation of shear-force feedback to regulate tip-sample separation adds another strength to NSOM. Using this distance regulation, a topographic image similar to that obtained by a conventional scanning force microscope is acquired simultaneously with the optical image. This provides a way to correlate structural and physical properties at the same sample positions and greatly simplifies interpretation of the NSOM data.

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