Westinghouse Electric Corporation

Koon W Loh

Peter R Emtage

Chi-Sheng Liu

A pulse laser system utilized for communication transmits a modulated pulsed laser beam having a precise wavelength to match a receiver. An etalon is positioned in the resonant cavity of the laser and is adjustable to tune the laser. A continuous wave reference beam is provided and is compared with the laser output beam and if the wavelength's bear other than a predetermined relationship with respect to one another, a control signal is generated to adjust the etalon in the laser resonant cavity. In one embodiment another etalon is placed in the reference beam path as well as the laser beam path with the transmitted beams being detected in order to derive normalized proportionality factors relating to each beam so that a comparison of the proportionality factors may be made and utilized for control purposes.

Wavelength stabilization for a pulsed tunable laser

A magnetostatic wave device which has broad application in the signal processing arena is disclosed herein. Basically, the magnetostatic wave device includes a layer of magnetized magnetic medium having a surface which includes a prespecified area to support the propagation of magnetostatic waves. A generator element is disposed at one end of the propagation area and is operative to carry an electromagnetic signal to generate magnetostatic waves supported by the propagation area. A pattern of conductive material having a plurality of conductive paths commonly coupled together at both ends is disposed in juxtaposition with the propagation area of the magnetic medium surface. In one embodiment, the conductive pattern includes a variable impedance coupled to each of a desired number of the conductive paths thereof to vary the impedance of the path. Each variable impedance is adjustable controlled in accordance with an applied governing signal. A receiver element is disposed at the other end of the propagation area and is operative to receive the propagated magnetostatic waves and render an output electromagnetic signal. More specifically, the pattern of conductive paths may include a planar array of a plurality of metallic strips disposed in juxtaposition with the propagation area of the magnetic medium surface and aligned in a substantially parallel array with spacings of no more than half a wavelength of the propagated magnetostatic wave apart. The parallel array alignment is transverse to the propagation path of the magnetostatic wave.

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Chatham, NJ, United States of America

Koon W Loh