公开(公告)号：AU2003268148A1

公开(公告)日：2004-04-23

申请号：AU2003268148

申请日：2003-08-20

Applicant: ROSEMOUNT INC

Inventor： WILLCOX CHARLES R ,  RUD STANLEY EDWARD JR ,  ROMO MARK GEORGE ,  LU LIANG-JU

IPC: B81B3/00 ,  G02B6/26 ,  G02B6/35

Abstract: A variable optical attenuator has a first movable waveguide support and a second waveguide support that include first and second waveguides, respectively, such that the first and second waveguides are aligned for propagating an optical energy. An electrically driven actuator positions the movable waveguide support for coupled, optical misalignment relative to the second support to achieve a desired optical attenuation value. The movable waveguide support may be in a cantilevered configuration in which a distal end extends over a surface having an electrode. In this example, applying a drive signal to the electrode deflects the movable support such that the signal coupled between the first waveguide to the second waveguide is attenuated. The drive signal may be set to achieve a desired value for an electrical parameter that varies with the position of the movable waveguide support. In some examples, the drive signal is set to achieve a desired capacitance or voltage difference between the movable waveguide support and the electrode.

公开(公告)号：DE112004000756T5

公开(公告)日：2006-05-04

申请号：DE112004000756

申请日：2004-03-23

Applicant: ROSEMOUNT INC

Inventor： ROMO MARK GEORGE ,  WILLCOX CHARLES R ,  RUD JR STANLEY EDWARD

IPC: G02B6/35 ,  G02B6/26

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.