Non-linear filter for dml

A method comprising:

• providing a drive current for driving a component;
• filtering the drive current with a non-linear filter to provide pre-compensated drive current pre-compensated for distortion in a signal resulting from driving the component with the drive current, wherein an output signal from the component in response to the pre-compensated drive current has reduced distortion and better approximates an ideal transmit signal for an intended modulation.

A circuit comprising:

• an input port for receiving a first signal;
• a plurality of taps, each tap comprising an input port for receiving a tap input signal, a first input port for receiving a first weight, a second input port for receiving a second other weight, and a scaling circuit for scaling an applied weighting based on the first weight and the second weight to scale the tap signal, the scaled tap signal for modifying the first signal.

A circuit comprising:

• an input port for receiving a first signal;
• a plurality of taps, each tap comprising an input port for receiving a tap input signal, a first input port for receiving a first weight, a second input port for receiving a second other weight, and a scaling circuit for scaling an applied weighting between the first weight and the second weight to scale the tap signal, the scaled tap signal for modifying the first signal.

A circuit comprising:

• an input port for receiving a first signal;
• a plurality of taps, each tap comprising an input port for receiving a tap input signal, a plurality of input ports each for receiving a weight, and a scaling circuit for scaling an applied weighting based on the received weights to scale the tap signal, the scaled tap signal for modifying the first signal.

A circuit comprising:

• an input port for receiving a first signal, the first signal received at a receiver via a communication interface and from a remote location;
• a plurality of taps, each tap comprising an input port for receiving a tap input signal, a plurality of weight input ports each for receiving a weight, and a scaling circuit for scaling an applied weighting based on the received weights to scale the tap signal, the scaled tap signal for modifying the first signal.

A method comprising

• providing a receiver for receiving a signal transmitted across an optical fibre and for providing an electrical first signal;
• using a filter, filtering the first signal with a non-linear filter to provide compensation to the first signal for distortion in the signal when transmitted resulting from driving a transmitter at a transmit end, wherein an output signal from the filter better approximates an ideal transmit signal for an intended modulation.

A circuit comprising:

• a non-linear FIR filter comprising a plurality of taps, each tap having multiple weights and a scaling circuit for scaling the multiple weights to affect a signal propagating within the tap for nonlinear filtering of a first signal.