Title:
【発明の名称】理想に近い帯域特性を有する音響光学フィルタ
Document Type and Number:
Japanese Patent JP2790379
Kind Code:
B2
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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Inventors:
SON GII FUU
Application Number:
JP51180794A
Publication Date:
August 27, 1998
Filing Date:
September 15, 1994
Export Citation:
Assignee:
BERU KOMYUNIKEESHONZU RISAACHI INC
International Classes:
G02F1/125; G02F1/01; (IPC1-7): G02F1/125
Attorney, Agent or Firm:
Yoshikazu Tani (1 person outside)