公开(公告)号：EP1149443A1

公开(公告)日：2001-10-31

申请号：EP99948194.8

申请日：1999-09-09

申请人： New Focus, Inc.

发明人： DAY, Timothy ,  TUGANOV, Alexander, V. ,  WU, I-Fan ,  PEASE, John ,  FARINAS, Alejandro, D. ,  ARNONE, David, F. ,  REITER, Kenneth, C. ,  BROWNELL, Michael ,  CARNEY, Robert, A. ,  MOORE, Bruce, A.

IPC分类号： H01S3/10

CPC分类号： H01S5/02248 ,  H01S3/105 ,  H01S3/1055 ,  H01S5/0427 ,  H01S5/0617 ,  H01S5/06213 ,  H01S5/06804 ,  H01S5/06832 ,  H01S5/0687 ,  H01S5/1039 ,  H01S5/141 ,  H01S5/143

摘要： The present invention provides an optical multimeter (100) for use in calibrating and testing optical components. The optical multimeter (100) includes an analog/digital signal generator (250) for delivering an output beam (260) over a wide range of frequencies, duty cycles and amplitudes. Circuitry is also provided for modulation (222) of an analog signal onto the output. The signal generator (250) includes a tunable laser that is thermally stabilized as to optical path length, as well as tuning angle of the tuning element. The tunable laser exhibits a small form factor due in part to a novel wavelength control process which utilizes an open loop system to maintain precise output wavelength (260) control without the requirement of either a wavelength or position feedback device. Additionally, the tunable laser incorporates an inexpensive modulator circuit (222) which combines a low frequency closed loop power control with a separate digital modulator.

公开(公告)号：EP1142038B1

公开(公告)日：2008-06-11

申请号：EP00991922.6

申请日：2000-11-03

申请人： New Focus, Inc.

发明人： PEASE, John ,  CABATIC, Sherwin, D. ,  MELVIN, Dennis, E.

IPC分类号： H01L41/04

CPC分类号： H02N2/101 ,  H02N2/0095 ,  H02N2/145

摘要： A method and apparatus for controlling a piezo-electric actuator coupled to a driven member is disclosed. The piezo-electric actuator (212) is responsive to waveforms (2040, 204) with asymmetrical voltage/current profiles on the rising and falling edge to effect consistent and cumulative movement of the driven member in one of two directions throughout the reciprocations of the piezo-electric actuator. The waveforms are digitally generated from a stored set of numbers or a function for generating the set of numbers. The numbers correspond with the discrete digital values associated with the desired waveforms for moving the driven member in either of at least two directions. The controller may be used to drive more than one piezo-electric actuator. The controller may include responsiveness to a feedback of the position of the driven member to accurately position the driven member. The controller may also include the ability to update the function or values stored in memory so as to couple more efficiently with the new or existing actuators.

公开(公告)号：EP1142038A1

公开(公告)日：2001-10-10

申请号：EP00991922.6

申请日：2000-11-03

申请人： New Focus, Inc.

发明人： PEASE, John ,  CABATIC, Sherwin, D. ,  MELVIN, Dennis, E.

IPC分类号： H01L41/00

CPC分类号： H02N2/101 ,  H02N2/0095 ,  H02N2/145

摘要： A method and apparatus for controlling a piezo-electric actuator coupled to a driven member is disclosed. The piezo-electric actuator (212) is responsive to waveforms (2040, 204) with asymmetrical voltage/current profiles on the rising and falling edge to effect consistent and cumulative movement of the driven member in one of two directions throughout the reciprocations of the piezo-electric actuator. The waveforms are digitally generated from a stored set of numbers or a function for generating the set of numbers. The numbers correspond with the discrete digital values associated with the desired waveforms for moving the driven member in either of at least two directions. The controller may be used to drive more than one piezo-electric actuator. The controller may include responsiveness to a feedback of the position of the driven member to accurately position the driven member. The controller may also include the ability to update the function or values stored in memory so as to couple more efficiently with the new or existing actuators.