An 80-Gbaud Transmitter using Bandwidth Interleaving with Sideband Cancelling Method

We have proposed a transmitter using bandwidth interleaving for high-speed optical communications. Baseband signals generated at two digital-to-analog converters are connected as one broad baseband signal using a mixer and combiner. Here, we propose a sideband cancelling method that can generate a desired signal without the filters and guard band that are conventionally required for removal of a sideband signal of the mixer. A transmission of 80-Gbaud BPSK signal is demonstrated by the proposed transmitter.