Optical sweep signal generator

Details Optical sweep signal generator Optical sweep signal generator

1995-03-29

1996-08-20

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356345, 372 32, G01B 902

Patent

active

055484026

ABSTRACT:
In an optical sweep signal generator, output beams of a variable-wavelength laser are supplied to an optical branch in which they are divided into first and second beams. The first beam, branched by the optical branch, is delayed by an optical delay line, from which a delayed beam is outputted. An optical mixer mixes the second beam together with the delayed beam so as to produce a mixed beam, which is then supplied to an optical detector. The optical detector performs heterodyne wave detection on the mixed beam. Then, a frequency analyzer performs a frequency analysis on result of the heterodyne wave detection so as to detect heterodyne beat frequency. The variable-wavelength laser is controlled in such a way that the heterodyne beat frequency detected does not vary with respect to time in a selected period of time. Thus, the sweep optical frequency to be realized is varied linearly with respect to time.

REFERENCES:
patent: 4893352 (1990-01-01), Welford

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