University of Essex

Modetek, Inc

Dariush Mirshekar-Syahkal

Eric Goutain

Seyed H Sadeghi

An integrated high speed driver/modulator assembly includes a driver amplifier assembly having a specified input impedance, such as 50 ohms. The driver/modulator assembly also includes an optical modulator having a modulator transmission line. The impedance of the modulator transmission line is less than the specified input impedance, which results in a reduced V&pgr; for the optical modulator. The reduction in V&pgr; enables the driver/modulator assembly to more effectively support OC-768 and higher data rates of at least 40 Gb/s.

Optical modulator with integrated driver

In a non-destructive method for the detection of surface cracks in metals, an eddy current is induced in the surface region of a workpiece under test, at a frequency sufficiently high to generate an alternating magnetic field solely in the skin region of the workpiece. That alternating surface magnetic field is interrogated by means of a relatively small electro-magnetic induction sensor, having regard to the overall area of the induced magnetic field. The sensor provides a voltage output which is analysed, preferably in real time, to yield an indication sensor. Also described is a probe for performing such a method.

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Colchester, United Kingdom

Dariush Mirshekar-Syahkal