International Business Machines Corporation

Analog Devices,inc.

Amit Burstein

Daniel Shkap

Dahong Qian

Marc Hertzberg

Wayne Wong

Da-Hai Ding

A novel optical path switching system, architecture and technique wherein light beam data traffic is to be switched by MEMS mirrors between source and destination nodes, and test ports are used to set up optical paths even before the real data traffic is propagated, with a combination of an electrical mirror-sensing feedback loop for controlling coarse mirror positioning, and an optical path power-sensing feedback loop for controlling fine adjustments in the mirror position.

Method of and architecture for optically switching light communication signals in fiber optic networks and the like

The invention relates to a device for transitioning a bandgap reference circuit to its operational mode, of supplying a reference voltage, when power is supplied to the combined circuits. The device is comprised of a supply-independent biasing circuit that is electrically connected to a start-up circuit and supports the start-up circuit's ability to cause a bandgap reference circuit to transition to its operational mode for any supply voltage that supports the bandgap reference circuit's operational mode.

Bandgap reference voltage startup circuit

The invention relates to a voltage regulator providing high immunity to DC variations of a power supply. The voltage regulator comprises a voltage regulator circuit, a gain stage that is connected to the output of the voltage regulator circuit, and a voltage modulation device forming a signal feedback loop between an output and an input of the gain stage. An initial reference voltage is generated by the voltage regulator circuit and provided to an input of the gain stage. The difference between this initial reference voltage and a fractional portion of the feedback signal, from the voltage modulation device, is amplified by the gain stage. The amplified signal of the gain stage is used to modulate the reference voltage provided to an external load. Better DC accuracy and stability is obtained by using a two stage amplifier to increase the loop gain of the voltage regulator.

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Tewksbury, MA, United States of America

Amit Burstein