Encoding for optical transmission

Apparatus for encoding an input signal for optical transmission, the apparatus comprising:

• a first component configured to generate a first signal based on the input signal by providing a first delay, and by low pass filtering the input signal,
• a second component configured to generate a second signal based on the input signal and based on a second delayed version of the input signal having a second delay larger than the first delay, such that in response to a pulse on the input signal, the second signal has a sequence of two pulses, the two pulses coinciding respectively with leading and trailing edges of a corresponding pulse on the first signal, and
• an optical output component configured to generate an encoded optical output signal based on the first signal and the second signal.

A computer program product comprising a computer readable storage medium on which a computer program is stored, the computer program comprising computer code which, when run on processing circuitry of an encoding apparatus, causes the encoding apparatus to:

• generate a first signal based on the input signal by providing a first delay, and by low pass filtering of the input signal,
• generate a second signal based on the input signal and based on a second delayed version of the input signal having a second delay larger than the first delay, such that in response to a pulse on the input signal, the second signal has a sequence of two pulses, the two pulses coinciding respectively with leading and trailing edges of a corresponding pulse on the first signal, and
• generate an encoded optical output signal based on the first signal and the second signal.