Title:
可変光減衰器
Document Type and Number:
Japanese Patent JP2007500378
Kind Code:
A
Abstract:
A variable optical attenuator has first waveguide and a second waveguide that are optically coupled together. At least one of the waveguides has a movable cantilever portion that is movable relative to the other to control attenuation of an optical signal traveling between the two. Preferably, electrically driven actuators deflect the movable waveguides to a relative position at which a desired optical attenuation value is achieved. Each movable waveguide may deflect in an opposite direction to the other waveguide. The electrically driven actuator receives a drive signal that controls the amount of deflection. The electrically driven actuator may be an electrostatic, electrothermic, or electromagnetic actuator. In the example of an electrostatic actuator, one electrode may be disposed on a movable waveguide and another adjacent the moveable waveguide to create the electrostatic force that moves the waveguide. The drive signal may be set to achieve a desired value for an electrical parameter that varies with the position of the movable waveguide. In some examples, the drive signal is set to achieve a desired capacitance or voltage difference between the movable waveguide and an electrode.
Inventors:
Lomo, Mark, George
Wilcox, Charles, Earl.
Rad, Stanley, Edward, Junior
Wilcox, Charles, Earl.
Rad, Stanley, Edward, Junior
Application Number:
JP2006532335A
Publication Date:
January 11, 2007
Filing Date:
March 23, 2004
Export Citation:
Assignee:
Rosemount Incorporated
International Classes:
G02B26/02; G02B6/00; G02B6/26; G02B6/35
Attorney, Agent or Firm:
Atsushi Nakajima
Kato Kazunori
Katsuichi Nishimoto
Kato Kazunori
Katsuichi Nishimoto