Abstract: A microelectromechanical system (MEMS) resonator includes a substrate having a substantially planar surface and a resonant member having sidewalls disposed in a nominally perpendicular orientation with respect to the planar surface. Impurity dopant is introduced via the sidewalls of the resonant member such that a non-uniform dopant concentration profile is established along axis extending between the sidewalls parallel to the substrate surface and exhibits a relative minimum concentration in a middle region of the axis.

Abstract: A system for monitoring financial threats includes: at least one central processing unit and system memory that causes the system to: receive information about a threat associated with a financial services device; identify a type of the threat; identify a location associated with the threat; and notify one or more customers associated with the financial services device based upon the type or the location of the threat.

Abstract: An optical communication system includes a transmitter for generating a subcarrier multiplexed optical signal from a pilot tone, a receiver and an optical fiber for coupling the optical signal from the transmitter to the receiver. At the transmitter, an optical carrier is modulated with a composite modulation signal including a plurality of modulated microwave subcarriers to provide the optical signal and pilot tone for carrier and clock recovery. The receiver includes a local oscillator for generating a local light beam, a detector responsive to the received optical signal and the local light beam for providing a detected signal at an intermediate frequency, and a microwave receiver for receiving the detected pilot tone for simultaneously generating the subcarrier frequencies for demodulating the microwave subcarriers from the detected signal, an automatic frequency control signal for controlling the local oscillator, and the clock signal.

Abstract: Apparatus for and method of communicating over a local area network is disclosed. Multiple nodes are connected by an optical fiber in a ring architecture. The cable supports multiple subcarrier multiplexed data communication channels for transmitting and receiving message data between the nodes and a control channel for partitioning nodal access to the individual data channels. Tokens are circulated on the control channel indicating the status of each data channel. A node desiring to send, acquires an open data channel by marking the corresponding control channel token to show that the selected data channel is no longer available, inserts the node destination address into the control channel token, and transmits data on the acquired data channel. A node recognizing its address in the control channel token's destination address field for a particular data channel tunes its receiver to accept data on that channel.

Abstract: An optical communication system includes an optical transmitter for transmitting a subcarrier multiplexed optical signal through a single mode optical fiber to an optical receiver. The optical transmitter includes a semiconductor laser diode for generating a light beam. The laser diode is preferably a high speed InGaAsP laser diode emitting in a spectral range of 1.3-1.6 micrometers. The light beam is intensity modulated with a composite modulation signal to provide the optical signal for transmission. The composite modulation signal includes multiple modulated microwave carriers that cover a total bandwidth greater than one octave. Harmonics and intermodulation products do not interfere with transmission, and a favorable signal-to-noise ratio or bit error rate is maintained when the bandwidth of the composite modulation signal exceeds one octave.