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in creator/contributor: "Ogle, J.W."

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Characterization of fiber optic cables under large tensile loads

Fiber optic cables designed for the Nevada Test Site (NTS) have to withstand an unusually harsh environment. Cables have been manufactured under a 6 year old DOE specification that has been slightly modified as the cable requirements are better understood. In order to better understand the cable properties a unique capability has been established at the NTS. Instrumentation has been developed to characterize the transmission properties of 1 km of fiber optic cable placed under a controlled tens… more

Date: January 1, 1984

Creator: Ogle, J.W. & Looney, L.D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Signal enhancement by spectral equalization of high frequency broadband signals transmitted through optical fibers

A new technique is discussed for enhancing the bandwidth and intensity of high frequency (> 1 GHz) analog, spectrally broad (40 nm) signals transmitted through one kilometer of optical fiber. The existing method for bandwidth enhancement of such a signal uses a very narrow (approx. 1 nm) filter between the fiber and detector to limit bandwidth degradation due to material dispersion. Using this method, most of the available optical intensity is rejected and lost. This new technique replaces the … more

Date: January 1, 1980

Creator: Lyons, P. B.; Ogle, J. W. & Holzman, M. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Radiation-induced transient attenuation of PCS fiber

Some applications of optical fibers require their exposure to intense radiation fields. This exposure can potentially degrade performance of a fiber data link. Research at Los Alamos National Laboratory has recently concentrated on development of an understanding of such radiation effects at short times, less than 100 ns. In previous papers we have identified a particular type of fiber, ITT plastic-clad-silica (PCS) with Suprasil core as optimum for short time radiation-induced attenuation, but… more

Date: January 1, 1983

Creator: Lyons, P. B.; Looney, L. D. & Ogle, J. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Radiation damage in optical fibers

While plastic-clad-silica (PCS) fiber shows the greatest radiation resistance, PCS fiber has been difficult to reliably connectorize for routine field operations. For this reason, all-glass fibers have been studied as an alternative to PCS. Based on available literature and some preliminary tests at Los Alamos, we have concentrated on fluorosilicate clad, step index, pure silica core fibers. This paper reviews recent laboratory data for these fibers relative to the PCS fibers. This paper also d… more

Date: January 1, 1983

Creator: Lyons, P. B.; Looney, L. D. & Ogle, J. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Signal enhancement by spectral equalization of high-frequency broadband signals transmitted through optical fibers

A new technique is discussed for signal strength enhancement of high-frequency (>1 GHz), spectrally-broad, analog signals through 1 km of optical fiber. The conventional method for optical measurement of high-frequency gamma ray signals is to use an optical fiber placed in the gamma radiation beam as a Cerenkov transducer. The radiation-induced optical signal is degraded by material dispersion in transmission through the fiber. To reconstruct the signal (which is carried by each wavelength) and… more

Date: January 1, 1981

Creator: Ogle, J. W.; Lyons, P. B. & Holzman, M. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Overview of pulsers for nanosecond gating of image-shutter tubes

The capability of generating a useful optical shutter of a few nanoseconds or less utilizing gated proximity-focussed microchannel-plate (MCP) wafer tubes or silicon intensified target (SIT) vidicon tubes depends strongly on the driving electrical pulse. This paper will provide a summary of some of the electrical gate pulsers utilized in studying both proximity-focussed MCP imaging intensifiers and gated SIT FPS vidicon tubes. (WHK)

Date: January 1, 1982

Creator: Yates, G.J.; Ogle, J.W.; King, N.S.P. & Aeby, I.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

100 MHz fiber optic single transient gamma ray detection system

A fiber optic system has been developed to measure single transient gamma rays. The gamma ray signature is converted to light by the Cerenkov process in a 20 cm length of radiation resistant optical fiber. The signal is transmitted over 1 km of optical fiber and detected by state-of-the-art, 175 MHz analog receivers. The receivers are based on silicon PIN detectors with transimpedance hybrid amplifiers and two stages of power amplification. The dc coupled receivers have less than 2% distortion … more

Date: January 1, 1984

Creator: Ogle, J. W.; Smith, R. C.; Ward, M.; Ramsey, R. & Hollabaugh, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Nanosecond-Gating Properties of Proximity-Focused Microchannel-Plate Image Intensifiers

Some fundamental properties of 18-mm-diam gated proximity-focussed microchannel-plate (MCP) image intensifiers used as fast image shutters in the 1 to 10 ns range have been identified and studied. Light pulses (approx. 5 ps wide) from a modelocked dye laser optically sample the gated MCP. Shuttering is achieved by applying a forward-biasing electrical gate pulse to the quiescently reverse-biased photocathode-MCP interface. Variable delay (approx. 30 ps jitter) between the gate pulse and the las… more

Date: January 1, 1981

Creator: King, N.S.P.; Yates, G.J.; Jaramillo, S.A.; Ogle, J.W. & Detch, J.L.,Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Image Shutters: Gated Proximity-Focused Microchannel-Plate (MCP) Wafer Tubes vs Gated Silicon Intensified Target (SIT) Vidicons

The imaging characteristics of two fast image shutters used for recording the spatial and temporal evolution of transient optical events in the nanosecond range have been studied. Emphasis is on the comparative performances of each shutter type under similar conditions. Response data, including gating speed, gain, dynamic range, shuttering efficiency, and resolution for 18 and 25-mm-diam proximity-focused microchannel-plate (MCP) intensifiers are compared with similar data for a prototype elect… more

Date: January 1, 1982

Creator: Yates, G. J.; King, N. S. P.; Jaramillo, S. A.; Ogle, J. W.; Noel, B. W. & Thayer, N. N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Characterization of low-loss multimode optical fibers for nuclear diagnostics

The application of low loss multimode optical fibers to nuclear diagnostics has been discussed in previous papers. Fiber requirements for this application differ substantially from those for normal communications use. The emphasis for nuclear measurements has been on development of high frequency analog fiber optic transmission line systems, which range from 100 MHz to > 500 MHz signals transmitted at 600 nm and 800 nm, respectively. Accordingly, specialized fiber characterization procedures ov… more

Date: January 1, 1980

Creator: Ogle, J. W.; Nelson, M. A.; Davies, T.J.; Lutz, S.; Lin, C. H.; Theobald, K. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Improvements to a high-frequency fiber-optic system for plasma diagnostics

A system for high-frequency recording of plasma diagnostics has previously been reported. Substantial improvements have been made in the system response, dynamic range, and calibration of the system. Plastic-clad silica fiber is used as a radiation-to-light converter using the Cerenkov process. A spectral equalizer device is used to compensate for the material dispersion in the fiber, increasing the frequency response (approx. = 1 GHz-km) and the dynamic range (a factor of > 20 over a FWHM 1 nm… more

Date: January 1, 1981

Creator: Ogle, J. W.; Lyons, P. B.; Looney, L.; Hocker, L.; Nelson, M. A.; Zagarino, P. A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department