Optical: systems and elements – Optical modulator – Light wave directional modulation
Patent
1996-09-04
1998-07-14
Ben, Loha
Optical: systems and elements
Optical modulator
Light wave directional modulation
359559, 359578, 356346, 356352, 385 33, G02F 133
Patent
active
057813329
ABSTRACT:
In a variable wavelength optical filter, a lens (3) is positioned at the output end of a first optical fiber (1) and transforms an input optical signal to parallel light. A dielectric interference optical filter (8) is located at the rear of the lens (3) in order to transmit only the light of particular wavelength. A lens (4) converges the light output from the filter (8) into the input end of a second optical fiber (2). A rotary plate (7) is affixed to the output shaft (6) of a servo motor (5) whose rotation angle is controlled by an electric signal fed from the outside of the filter. The filter (8) is mounted on the rotary plate (7) with the intermediary of a piezoelectric element or elements (9). The piezoelectric elements (9) are caused to oscillate by a modulating signal, so that the transmission center wavelength of the filter is varied. The resulting deviation of the transmission center frequency is detected.
REFERENCES:
patent: 3681608 (1972-08-01), Derderian et al.
patent: 3740144 (1973-06-01), Walker
patent: 3914055 (1975-10-01), Wolga et al.
patent: 4448486 (1984-05-01), Evans
patent: 4482248 (1984-11-01), Papuchon et al.
patent: 4508964 (1985-04-01), Gunning, III et al.
patent: 5040862 (1991-08-01), Burton et al.
patent: 5225888 (1993-07-01), Selwyn et al.
Suemura et al. (1993) "A Newly Developed Adaptive Wavelength Tunable Filter for Wavelength Selective Optical . . . " Proc. of European Conf. on Optical Comm. Papers of Swiss Elect. Assn. 2: 433-436.
Ben Loha
NEC Corporation
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