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Saturday, October 31, 2020 | History

2 edition of Measurement of far-field and near-field radiation patterns from optical fibers found in the catalog.

Measurement of far-field and near-field radiation patterns from optical fibers

Ernest M Kim

Measurement of far-field and near-field radiation patterns from optical fibers

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  • 4 Currently reading

Published by U.S. Dept. of Commerce, National Bureau of Standards, For sale by the Supt. of Docs., U.S. G.P.O. in Washington, D.C .
Written in English

    Subjects:
  • Fiber optics

  • Edition Notes

    StatementErnest M. Kim, Douglas L. Franzen
    SeriesNBS technical note -- 1032
    ContributionsFranzen, Douglas L, National Engineering Laboratory (U.S.). Electromagnetic Technology Division, United States. National Bureau of Standards
    The Physical Object
    Paginationiii, 40 p. :
    Number of Pages40
    ID Numbers
    Open LibraryOL18168711M

    Photon's far-field profilers characterize the angular radiation intensity of light simply and accurately. Both the LD and LD R (wide dynamic range goniometric radiometer) provide full 3-dimensional measurements of the far-field pattern . The near field and far field are regions of the electromagnetic field (EM) around an object, such as a transmitting antenna, or the result of radiation scattering off an object. Non-radiative 'near-field' behaviours of electromagnetic fields dominate close to the antenna or scattering object, while electromagnetic radiation . A radiation pattern refers to the spatial variation of the electromagnetic fields, the field intensity, and/or the irradiance (power density), produced in the far-field from a localized source. Most commonly, the .


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Measurement of far-field and near-field radiation patterns from optical fibers by Ernest M Kim Download PDF EPUB FB2

Measurement of far-field and near-field radiation patterns from optical fibers by Kim, Ernest M.; Franzen, Douglas L. Material Measurement Laboratory; Physical Measurement Laboratory; User Facilities.

Measurement of Far-Field and Near-Field Radiation Patterns from Optical Fibers. Published. February 1, Cited by: 2. Systems are described for measuring the far- and near-field radiation patterns from optical fibers.

Parameters Measurement of far-field and near-field radiation patterns from optical fibers book affect measurement precision, accuracy, resolution, and signal-to-noise ratio are discussed. Measurements using radiation patterns are covered; this includes radiation Author: E.

Kim, D. Franzen. CONTENTS Page 1. INTRODUCTION 1 IONPATTERNCONSIDERATIONSINOPTICALFIBERS 1 MeasurementsUtilizingFar File Size: 2MB. Additional Physical Format: Online version: Kim, Ernest M.

Measurement of far-field and near-field radiation patterns from optical fibers. Washington, D.C.: U.S.

When light emitting diodes and semiconductor lasers are being produced, there is often a need of quick measurement of some parameters.

Besides current-voltage and current-optical power characteristics we usually measure near field and far field radiation patterns and spectral : Roman Nowak, Tadeusz Reczynski. Both amplitude and phase of the field components are measured in each scan. Due to the optical nature of the probes, very wideband measurements can be performed up to 20GHz using the same probes.

From the scanned near field maps, the radiation pattern of the AUT is estimated using a near-to-far-field transformation.

The far-field radiation from the aperture is identical to that of a radiating magnetic dipole located at the center of the aperture for a normally incident plane wave.5,6 However, a real NSOM probe has an aperture that is not on an infi-nitely conducting plane but is at the end of a tapered optical fiber.

The transition from the near to the far field of the fundamental mode radiating out of a photonic crystal fiber is investigated experimentally and theoretically.

It is observed that the hexagonal shape of the near field rotates two times by π/6 when moving into the far field, and eventually six satellites form around a nearly gaussian far-field pattern.

The numerical aperture (NA) is a measurement of the ability of an optical fiber to capture light. It is determined by measuring the far-field power distribution in the region far from the fiber-end face.

Note 1: The far-field radiation pattern may be from any source, such as a radio antenna, a light source, or the end of an energized optical fiber. Note 2: The far-field radiation pattern for an optical fiber describes the distribution of irradiance as a function of the angle with the fiber axis at a distance from the fiber.

From the experimental measurements of the far field radiation pattern, we obtain transmission characteristics of PM PCF in terms of mode field diameters (MFD), V-values along major and minor axes, mode field area, birefringence, core radius, effective refractive index Cited by: 5.

1. In the output plane of a source, such as a radio antenna or a light source, a radiation pattern in which (a) the electric and magnetic field strengths of an electro-magnetic wave vary.

The plane of rotation of the optical fiber collector is the far-field measurement plane. The collected light then propagates to a stationary InGaAs detector. The detector signal is amplified by a transimpedance amplifier followed by a voltage amplifier with a total programmable gain range of dB.

Near Field Vibration Spectroscopy to Observe Molecular Images (S Kawata) DNA Single Molecule Imaging and Fluorescence Detection Using SNO/AM (J Wang et al.) A Measurement of LSF of PSTM Imaging with the Image of Step Spread (S-F Wu et al.) Numerical Simulation of Fiber Probe Patterns.

The measured far-field radiation pattern of the light intensity emitted from the end of the optical fiber is compared to the far-field radiation pattern calculated from the Fraunhofer. I use the direct far-field method to measure the mode-field diameter of a single-mode fiber with an expanded uncertainty of 30 nm, with a coverage factor of 2.

For a step-index fiber with a mode-field. The Mode-Field Diameter (MFD) and “spot size” of an assortment of lensed and tapered specialty fibers were determined from far- field and near-field measurements.

In the far field, measurements were made using a 3D-scanning goniometric radiometer. Scanning near-field optical microscopy (SNOM) in combination with interference structures is a powerful tool for imaging and analysis of surface plasmon polaritons (SPPs).

However, the correct interpretation of SNOM images requires profound understanding of principles behind their formation. To study fundamental principles of SNOM imaging in detail, we performed spectroscopic measurements Cited by: 5.

Near Field vs Far Field Antenna Radiation Pattern. This page covers antenna radiation pattern basics and also describes difference between Near field and Far field radiation patterns. Figure depicts radiation pattern of directional antenna. As shown in the figure, radiation pattern.

Fiber Optic Measurement Techniques is an indispensable collection of key optical measurement techniques essential for developing and characterizing today’s photonic devices and fiber optic systems.

The book gives comprehensive and systematic descriptions of various fiber optic measurement. FOTP Output Far Field Radiation Pattern Measurement FOTP - Measurement of Optical Fiber Cladding Diameter Using Laser-Based Instruments (ANSI/TIA/EIAB) (R) (R ) FOTP Measurement for Gamma Irradiation Effects on Optical Fiber.

Near-field measurement ranges use this transformation to get the far-field patterns of large antennas with measurements at much smaller ranges than 2D^2/lambda.

If you want to make a simple quick measurement just measuring power, then it has to be at 2D^2/lambda or more to get the far-field pattern. An important qualitative measure in characterizing a fiber waveguide is called the V-number of the fiber, given by V = k f a NA () where k f is the free-space wavenumber, 2π/λ (with λ the wavelength of File Size: KB.

Fiber Optic Measurement Techniques is an indispensable collection of key optical measurement techniques essential for developing and characterizing today’s photonic devices and fiber optic book gives comprehensive and systematic descriptions of various fiber optic measurement.

Far field: The radiation pattern can extend into the far field, where the reactive stored energy has no significant presence. The far field is the region in which the field acts as "normal" electromagnetic. Optical Fibers) • FOTP Output Far Field Radiation Pattern Measurement • FOTP Measurement of Optical Fiber Cladding Diameter Using Laser- Based Instruments • FOTP Measurement for Gamma Irradiation Effects on Optical Fiber and Cables • FOTP Light Launch Conditions (Long Length Graded Index Fibers)File Size: 65KB.

polarization, beam pointing etc. Near-field antenna measu-rement methods, in contrast to conventional far-field met-hods, make use of a measuring probe in the radiating near-field region of the antenna under test (AUT). The far-field (radiation) pattern of the AUT must then be indirectly com-puted from the measurements.

double ridged TEM horn antenna GZDRH radiation pattern obtained from far-field and cylindrical near-field measurements. The difference in vicinity of ° is caused by influence of vertical feed cable in far field.

In near field this influence is out of time window. optically-fed Fig. Comparison of double ridged TEM horn antenna radiation. far-field and the near-field image of the mode at the 2D-PC surface are different. Far-field results show the direct production of azimuthally polarized doughnut mode.

As opposed, near-field results yield a. The Helmholtz formula for the wave equation is used to determine the far‐field radiation patterns of large transducers from measurements of the near‐field pressures.

It is shown that under suitable circumstances the normal component of velocity that is required in the formula can be related to the pressure. With the aid of this approximation, the far‐field radiation pattern Author: G. Innis, C. Horton. I would like to calculate the far field diffraction pattern resulting from a guided mode in an optical waveguide.

My specific example: light is guided in the core of a photonic crystal fiber, reaches the end and gets diffracted into free space. How does the pattern look in the far field (or at a certain distance z away from the fiber). Backgrounds. The conventional far‐field optical imaging system suffers from resolution limitations, this is due to Abbe's theory that restrains the spatial resolution to a diffraction limit [].In case of far‐field imaging, forming an image is subjected to the Rayleigh criterion, which is the condition to resolve the diffraction pattern Author: Hatem El Matbouly.

Figure A long, thin optical fiber transmitting a light beam (Photograph courtesy Dr. Chynoweth) 2. Differentiate between two kinds of fibers. Take short pieces (~ 2 m) of a multimode optical fiber and a single-mode optical fiber File Size: 2MB.

In later chapters they cover optical sources, optical detectors, and fiber-optic communication system design. They also treat a wide variety of related topics such as doped fiber amplifiers, dispersion compensation, fiber sensors, and measurement techniques for the characterization of optical fibers.

The book /5(2). TIA FOTP Output Far-Field Radiation Pattern Measurement. English Select a Language: English; Français; Deutsch; About Us. Contact Us. Tools & Services. Abbreviations; Deposit.

when measuring the 3-D radiation pattern, efficiency and the gain of a small handset antenna in that small anechoic chamber show further that far-field measurements in such a small anechoic chamber does not result in greater measurement Cited by: The first article of this two-part series explores the basic concepts and techniques of antenna pattern measurement and evaluates the benefits and drawbacks of various measurement methods.

The concepts relating to near-field and far-field pattern. A goniophotometer can analyze the radiation pattern of an LED. The LED is pivoted about its tip and the intensity is measured.

That is, the angle theta is scanned, providing a profile of the radiated beam in one plane (see Fig. To record a two-dimensional radiation pattern.

Optical fiber measurement systems developed at the National Bureau of Standards are described. The topics covered in this volume are attenuation, bandwidth (frequency domain), and far field near field radiation patterns.

An optical fiber is a flexible, transparent fiber made by drawing glass or plastic to a diameter slightly thicker than that of a human hair.

Optical fibers are used most often as a means to transmit light between the two ends of the fiber and find wide usage in fiber .Profiling divergent light sources present many challenges, but Photon's patented Goniometric Radiometer Far-Field Profilers characterize the angular radiation intensity of light sources, such as laser diodes, LEDs, optical fiber.3 Far -field chromatic distribution The far-field intensity pattern from a weakly guiding optical fibre can be calculated with the aid of the pro posed electromagnetic model for the power distribution between the .