Agilent Technologies, Inc.

Avago Technologies Fiber IP (singapore) Pte. Ltd

Keith Everett

Kim Leeson

David Healy

Mark Jeffrey Dunn

Charles Graeme Ritchie

Barry John Vaughan

A subassembly apparatus includes a substantially shieldable interior chamber for housing at least one source of electromagnetic radiation, a connector plane external to the interior chamber for locating an end surface of a connector, and a launch window for locating an end surface of a waveguide, where the launch window is in or adjacent the connector plane. The apparatus also includes an internal propagation path extending from the interior chamber to the launch plane including a barrier of electrically conductive material disposed in the propagation path, the barrier being arranged to shield a planar region from electromagnetic radiation emitted from within the interior chamber, the planar region including substantially the connector plane substantially excluding the launch window.

Interface apparatus, connector apparatus and method of reducing electromagnetic interference

An electronic module having a configuration for promoting efficient heat dissipation and a circuit board assembly are provided such that when the electronic module is inserted within the circuit board assembly a portion of the electronic module overlaps an EMI shield, with the portion of the electronic module having a configuration for promoting efficient heat dissipation and being external of the EMI shield.

Electronic module

In an optical communications system, it is necessary to control the extinction ratio of a laser device ( ) of an optical transmission unit. The laser device ( ) is typically used to transmit a signal that can be approximated by a pseudo-random bit stream. The bit stream is monitored by collecting light from a back facet of the laser device ( ) using a photodiode ( ) in a control loop. Due to band limiting effects of the photodiode ( ) and parasitic circuit track capacitances, a feedback signal generated by the photodiode ( ) becomes distorted, leading to difficulties in controlling the extinction ratio. The present invention therefore provides an apparatus that simulates a signal generated by the photodiode ( ) and subsequent processing of the photodiode signal. The simulated signal and the processed photodiode signal are compared so as to generate a control signal for controlling modulation amplitude of the laser device ( ) and hence the extinction ratio.

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Bury St Edmunds, United Kingdom

Keith Everett