ADAPTIVE MACH ZEHNDER MODULATOR LINEARIZATION

摘要

The present invention is directed to optical communication systems and methods thereof. In various embodiments, the present invention provides method for linearizing Mach Zehnder modulators by digital pre-compensation and adjusting the gain of the driver and/or the modulation index. The pre-compensation can be implemented as a digital pre-compensation algorithm, which is a part of an adaptive feedback loop. There are other embodiments as well.

主权项

1. A modulation system comprising:
a nonlinear mapping module being configured to perform a mapping process to generate a voltage signal using a modulation signal and a first modulation index; a DAC module being configured to convert the voltage signal to an analog signal; a driver module being configured to generate a driving signal using the analog signal and a gain value, the driver module further being configured to adjust the gain value in response to a compensation signal; a peak detection module being configured to determine a peak value associated with the driving signal; an MZ modulator being configured to generate an output signal using at least the driving signal, the output signal being associated a half wave voltage value; and a compensation module being configured to generate the compensation signal using at least the first modulation index and the second module index, the second modulation index being a function of the peak value and the half wave voltage value.