Abstracts of Papers by Bell System Authors Published in Other Journals (01 May 1977)

is negligible, implying that direct emission is responsible for the presence of these compounds. ELECTRONIC AND ELECTRICAL ENGINEERING Frequency-Agile Millimeter-Wave Phase Lock System. P. S. Henry, Rev. Sci. Instrum. 47 (September 1976), pp. 1020-1025. A frequency-agile phase lock system for millimeter-wave klystrons is described. The system locks the klystron to a crystal-controlled reference signal derived from a frequency synthesizer. By programming the synthesizer, the klystron can be stepped through any sequence of frequencies lying within a band roughly 200 MHz wide. 

Optical-Fiber Impulse-Response Measurement System. J. W. Dannwolf, S. Gottfried, G. A. Sargent, R. C. Strum, IEEE Trans. Instrum. Meas JM-25, V. 4 (December 1976), pp. 401-406. This paper describes time-domain instrumentation designed to measure impulse response and delay of multimode optical fibers used in an experimental optical communications system at Bell Laboratories. Time-domain data is transformed to frequency-domain by a minicomputer, and the result is displayed as the fiber's baseband frequency response. 

Tantalum Thin Film RC Circuit Technology for a Universal Active Filter. W. Worobey and J. Rutkiewicz, IEEE Trans. Parts, Hybrids and Packag., PHP-12, No. 4 (December 1976), pp. 276-282. This paper describes the physical layout, process sequence, and component properties of an RC universal active filter. The high-precision filter is fabricated on a 16-pin dual in-line package ceramic substrate using tantalum thin film technology.