Patent ID: 11942993
Assignee: MOLEX, LLC
Field: Telecommunications (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 5:
6. The optical transmission device of claim 1, wherein
the multi-level pulse amplitude modulation signal is a four-level pulse amplitude modulation signal, and the four-level pulse amplitude modulation signal has a zeroth electrical level, a first electrical level, a second electrical level and a third electrical level;
when the asymmetrical optical modulator is operated at the positive slope of the transfer function and is controlled by the bias voltage offset adjust signal so that the bias voltage point of the asymmetrical optical modulator itself offsets to above the quadrature point of the positive slope of the transfer function, the multi-level pulse amplitude modulator modulates the data input according to the electrical level adjust signal, to cause the first electrical level and the second electrical level of the multi-level pulse amplitude modulation signal generated by the multi-level pulse amplitude modulator to offset toward the zeroth electrical level; and
when the asymmetrical optical modulator is operated at the positive slope of the transfer function and is controlled by the bias voltage offset adjust signal so that the bias voltage point of the asymmetrical optical modulator itself offsets to below the quadrature point of the positive slope of the transfer function, the multi-level pulse amplitude modulator modulates the data input according to the electrical level adjust signal, to cause the first electrical level and the second electrical level of the multi-level pulse amplitude modulation signal generated by the multi-level pulse amplitude modulator to offset toward the third electrical level.