Carrier Access Corporation

Phil Couch

The present invention provides an optical network unit having a control means. The control means uses programmable logic to cause the optical network unit to function within established protocols.

Methods and apparatuses for using programmable logic for protocol controls in a passive optical network

Apparatus for digitally driving a laser in a passive optical network includes a programmable current source having an output terminal connected to supply current to the laser. The programmable current source includes a plurality of output pins, each of the outputs pins has a voltage thereon, all of the output pins are connected to the output terminal, and one or more of the output pins is connected to the output terminal through a resistor. A controller supplies a digital control signal to the programmable current source to specify which of the output pins are to be turned on, to thereby determine the magnitude of a current supplied to the laser from the output terminal.

Methods and apparatuses for direct digital drive of a laser in a passive optical network

The present invention provides apparatuses and methods for measurement and control of a laser in a passive optical network. In particular, prior to receiving a transmission grant, the laser is pre-driven at a current below a predetermined threshold to &ldquo;pre-charge&rdquo; the laser. Also, during the zero level measurement interval, the laser is driven at a non-zero level and the required zero level current is calculated.

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Honiton, United Kingdom

Phil Couch