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Demonstrated are 1060 nm microelectromechanical-systems-based tunable vertical-cavity surface-emitting lasers (MEMS-VCSELs) with a 100 nm continuous tuning range under repetitively scanned operation at rates beyond 500 kHz and a 90 nm continuous tuning range under static operation. These devices employ a thin strained InGaAs multiple quantum well active region integrated with a fully oxidised GaAs/...
A controller for a tunneling accelerometer has two tasks: to establish tunneling and to maintain tunneling during acceleration. This paper describes the design and implementation of a digital controller that accomplishes these tasks and provides the appropriate gain switching. The control law is based on a standard configuration of an observer and state feedback. A digital controller is implemented...
This paper describes a design methodology for force balance sensors and applies it to the design of a tunneling accelerometer. A controller based on feedback from estimated states is a natural basis for the design. It provides a controller with a rich choice of design methods. The feedback gains can be used to tune the motion of the mass but they do not influence the sensor transfer function that...
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