METHODS AND APPARATUS FOR OPTICAL COMMUNICATIONS VIA PULSE AMPLITUDE MODULATION (PAM) IN DENSE WAVELENGTH-DIVISION MULTIPLEXING (DWDM) SYSTEMS

摘要

A method includes modulating a digital signal via pulse amplitude modulation (PAM) and applying Nyquist shaping to the digital signal to generate a filtered digital signal. The method also includes converting the filtered digital signal into an analog signal and transmitting the analog signal in an optical communication channel via a dense wavelength division multiplexing (DWDM) scheme.