Wavelength controlled optical true time delay generator

Details Wavelength controlled optical true time delay generator Wavelength controlled optical true time delay generator

1992-03-18

1995-10-24

Healy, Brian

Optical waveguides

With optical coupler

Input/output coupler

385 11, 385 16, 385 18, 385 31, 385 24, 359123, 359140, 372700, 343721, G02B 634, G02B 628, H01Q 106

Patent

active

054616875

ABSTRACT:
A wavelength controlled optical true time delay generator (14) utilizes passive switching to direct an optical beam to different length paths depending on the input wavelength. In one embodiment a dispersive element (20) is used to reflect the input beam at different angles depending on the incident wavelength. Different optical paths are then provided for the light reflected at different angles. In another embodiment, an optical fiber (50) is provided with reflective gratings (52), each of which are reflective at different wavelengths. The gratings (52) are positioned at different lengths along the optical fiber (50) to provide for different path lengths of light reflected by the gratings and back down the optical fiber (50) to an optical output (38). The true time delay generator (14) provides for a true time delay of any length in a low loss switching mechanism which is relatively inexpensive and compact.

REFERENCES:
patent: 4725844 (1988-02-01), Goodwin et al.
patent: 4864312 (1989-09-01), Huigvard et al.
patent: 5048913 (1991-09-01), Glenn et al.
patent: 5066133 (1991-11-01), Brienza
patent: 5117239 (1992-05-01), Riza
patent: 5210807 (1993-04-01), Ames
patent: 5231405 (1993-07-01), Riza
patent: 5305009 (1994-04-01), Goutzoulis et al.

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