1. An apparatus, comprising:
an optical transmitter module configured to be electrically coupled to an electrical serializer/deserializer and a controller,
the optical transmitter module including an electrical detector configured to receive an in-band signal,

the electrical detector configured to send to a controller a first power error signal based on the in-band signal such that
the controller sends a correction control signal to the electrical serializer/deserializer based on the first power error
signal and a second power error signal and such that the electrical serializer/deserializer modifies a pre-emphasized signal
to the optical transmitter module based on the correction control signal,

the first power error signal, the second power error signal and the correction control signal being out-of-band.