Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-07-31
1998-04-28
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
385140, H04J 1402, G02B 600
Patent
active
057452717
ABSTRACT:
An optical signal attenuation device and associated method for selectively attenuating the signal strengths of different wavelength signals contained within a multiplexed optical transmission. The attenuation device includes a diffracting element that diffracts the multiplexed optical system and directs the different wavelength signals onto separate optical paths. A modulator array is provided that contains a plurality of optical modulators spaced at a pitch so that each modulator receives one of the different wavelength signals. Each optical modulator causes a signal to be produced that correspond to the signal it receives, except that the signal strength of the emitted signal is altered to fall within a desired range. Each signal emitted by the optical modulators is again directed toward a diffraction element. The diffraction element combines the separate wavelength signals, thereby producing a multiplexed signal where each wavelength has a signal strength that falls within a common range.
REFERENCES:
patent: 5526155 (1996-06-01), Knox et al.
Ford Joseph Earl
Miller David Andrew Barclay
Nuss Martin C.
Walker James Albert
Lucent Technologies - Inc.
Negash Kinfe-Michael
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