Optical waveguides – With optical coupler – Movable coupler
Patent
1990-08-27
1991-11-19
Lee, John D.
Optical waveguides
With optical coupler
Movable coupler
385 27, 385 33, 385 52, G02B 632
Patent
active
050660888
ABSTRACT:
A fiberoptic-coupled free-space variable delay line is provided wherein the phase adjustment of the signal can be accurately set. A microscope-objective lens collimates a signal beam which is received by a focusing lens. The focusing lens is provided on an adjustable carrier to allow one to accurately adjust the distance travelled by the collimated signal base and thereby accurately adjust the off-set. A plurality of these variable delay lines can be arranged to form a multiplexer. If the threads on each drive rod moving a carrier are different, the carrier can be adjusted to accommodate changes in frequency of the signal.
REFERENCES:
patent: 4671605 (1987-06-01), Soref
patent: 4815806 (1989-03-01), Owen
patent: 4959540 (1990-09-01), Fan et al.
John AuYeung, Appl. Phys. Lett. 38, 308-310 (1981).
A. Takada, M. Saruwatari, Electron Lett. 24, 1406-1408 (1988).
Chantry Peter J.
Davies David K.
Goutzoulis Anastasios P.
Barns Stephen W.
Lee John D.
Nixon Norman A.
Westinghouse Electric Corp.
Williamson John K.
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