Optical processing technique for spot-size measurements in single-mode fibres

1985 ◽  
Vol 21 (2) ◽  
pp. 56 ◽  
Author(s):  
R. Caponi ◽  
G. Coppa ◽  
P. Di Vita ◽  
U. Rossi
Keyword(s):  
Single Mode ◽  
Spot Size ◽  
Processing Technique ◽  
Optical Processing

Study on Coupling of Step and Graded Index Single Mode Optical Fiber Considering the Transverse Misalignment

2020 ◽  
Vol 8 (2) ◽  
pp. 78-82
Author(s):  
Prosenjit Roy Chowdhury ◽  
◽  
Keyword(s):  
Optical Fiber ◽  
Communication Systems ◽  
Structural Parameters ◽  
Fractional Power ◽  
Single Mode ◽  
Spot Size ◽  
Fiber Coupling ◽  
Fundamental Parameters ◽  
Graded Index ◽  
Wide Range

"Advance design and day to day up-gradation of communication system is the requirement of international telecommunication. The optical communication systems involve the effective fiber coupling or splicing to meet the need of long communication channel. When the studies on both the intensive and extensive properties of optical fiber are exploring new research horizons, the effectiveness of such systems can be calibrated with transmission parameters like transmitted fractional power, which is a function of ‘spot size’ as well. Our study of fiber junctions based on fundamental parameters like wavelength, fiber profile index etc. has touched some unrevealed areas and explored some interesting results. The profile index of optical fiber has received less attention compared to other structural parameters of optical fiber but our study at important wavelengths for different profiles has shown that the less-used fiber profiles has some interesting premier outcomes, which can introduce some significant impact on optical fiber based system design and engineering. We have observed almost frequency or wavelength independent transmitted fractional power around the most used 1.55 micrometer wavelengths at some rarely used fiber profile index. Our study predicts the best and worst fiber profiles for transmitted fractional power (T ), at the same time, we have observed the fiber profile index independent region for a band of ‘T’ values. The reporting and its approach are found to be premier in this field. So, our work is reporting a comparison of effective fiber-to-fiber coupling, based on fiber profile index of different fibers. It is also giving a clear view of the wavelength dependency of effective fiber coupling for different fibers having wide range of graded fiber profiles."

Erratum: Reply to Comment on ‘Fundamental mode spot-size measurement in single-mode optical fibres’

1982 ◽  
Vol 18 (21) ◽  
pp. 936
Author(s):  
F. Alard ◽  
L. Jeunhomme ◽  
M. Monerie ◽  
P. Sansonetti ◽  
C. Vassallo
Keyword(s):  
Fundamental Mode ◽  
Single Mode ◽  
Spot Size ◽  
Optical Fibres ◽  
Size Measurement

New method for measuring the spot size of single-mode fibers

1980 ◽  
Vol 5 (12) ◽  
pp. 505 ◽  
Author(s):  
J. Streckert
Keyword(s):  
Single Mode ◽  
Spot Size ◽  
New Method

OPTICAL PROCESSING AND INTERPRETATION

Geophysics ◽  
1967 ◽  
Vol 32 (5) ◽  
pp. 801-818 ◽  
Author(s):  
John C. Fitton ◽  
Milton B. Dobrin
Keyword(s):  
Seismic Data ◽  
Optical Filters ◽  
Frequency Discrimination ◽  
Visual Presentation ◽  
Processing Technique ◽  
Multiple Reflections ◽  
Optical Processing ◽  
Seismic Section ◽  
Optical Techniques ◽  
One Dimensional

Although the use of optical techniques for enhancing seismic data has become well established, the applicability of these techniques to seismic interpretation is not so widely recognized. Optical processing is ideally suited for use as a direct aid to interpretation because of the precision with which filtering can be controlled and because of the flexibility made possible by the instantaneous visual presentation of the filtered data. Frequency relationships in seismic data have great value in interpretation, and optical techniques are particularly suitable for bringing out such relationships. The one‐dimensional optical transform displays a channel‐by‐channel spectrum of a seismic section from which useful geological information can be inferred. On such transforms significant effects can often be brought out which are not discernible on the corresponding record sections. Reefs, for example, often cause a thinning of overlying formations which gives rise to a high‐frequency anomaly on the transform, even at levels so shallow in the section that no evidence for reef effects is apparent to the eye on the original records. Characteristic frequency anomalies can also be observed over faults. One‐dimensional transforms from sections made over features of both kinds show diagnostic patterns that can be used as a basis for detection. The sharp cutoffs and flexibility available in optical filters make it possible to discriminate between conflicting events on record sections by frequency filtering alone. With proper monitoring, one can select those cutoff frequencies which bring out events that appear geologically most plausible. Multiple reflections, for example, can often be eliminated by frequency discrimination once the geophysicist identifies the primary reflections on the monitor. Often seismic records are discarded as useless, when in reality they are simply too complex to interpret because a large number of events, all potentially significant, overlap. Such events can be sorted out for possible use by optical filtering and concurrent monitoring. No other processing technique allows the geophysicist to do this so easily.

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