Optical communication transmitter system

摘要

An optical transmitter may include a sample rate converter and a digital-to-analog converter operable to convert an inputted digital electrical signal to an analog optical signal. The signal converter may include a first interface operable to receive a digital electrical signal that may include a block of input data having N symbols in a time domain. The signal converter may also include: a first module operable to transform, via a Fourier Transform, the input data having N symbols from the time domain to a frequency domain; a second module operable to up-sample the N frequency domain samples so that there are 1.6N, 2N, or 2.67N frequency domain samples, for example; and then a third module operable to transform, via an inverse Fourier Transform, the 1.6N, 2N, or 2.67N frequency domain samples to an equivalent number of time domain samples at 1.6, 2.0, or 2.67 samples per symbol, respectively.

主权项

1. A method performed by a signal processor of a baud-rate flexible optical transmitter, comprising:
receiving a digital electrical signal comprising a block of input data having N symbols in a time domain; transforming the input data from the time domain to a frequency domain, resulting in first transformed data; duplicating and concatenating N frequency domain samples of the first transformed data so that there are 2N frequency domain samples, resulting in duplicated data; transforming the duplicated data from the frequency domain to the time domain so that there are 2N time domain samples, resulting in second transformed data; and communicating the second transformed data to a fixed-sample-rate digital-to-analog converter.