Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1993-10-01
1995-03-21
Lee, John D.
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359308, 385 7, G02F 111
Patent
active
054001714
ABSTRACT:
An acousto-optic tunable filter (100) is provided with an acousto-optic interaction profile that results in a frequency response with near-ideal bandpass filter characteristics of near-unity transmission inside the passband and near-zero transmission outside the passband. The acousto-optic interaction profile which results in this frequency response has a phase polarity which alternates and is damped, i.e. the acousto-optic interaction profile has a damped oscillating shape. The physical structure to implement this filter comprises a pair of acoustical waveguides (110, 112) which taper toward each other at the beginning of the profile and then are spaced apart by a constant distance. A damping layer (132) or other damping structure is provided to achieve the damping characteristics of the profile.
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Bell Communications Research Inc.
Lee John D.
Suchyta Leonard Charles
Yeadon Loria B.
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