Abstract
Advances in the performance and flexibility of future optical networks will be brought about through the use
of high-speed digital signal processing (DSP) for the generation of advanced optical signal formats and the
compensation of transmission impairments. The use of field-programmable gate arrays (FPGAs) to implement
experimental transceivers employing novel DSP techniques is attractive, as they are of low cost and are
reprogrammable. In this paper, the design of a reprogrammable FPGA-based 10-Gb/s optical transmitter using real-time
DSP is described and assessed through simulation. Using a single Xilinx Virtex-4 FPGA, digital filtering based on
lookup tables with up to 12-bit addressing could be implemented. We also present, for the first time, a simulation
technique using industry-standard digital design simulation tools (Mentor Graphics Modelsim) in combination with a
simulation of analog microwave components, optical transmission, and bit-error-rate estimation to assess the
performance of the full transmission system. This simulation technique is used to demonstrate 10-Gb/s transmission
over 550 km of standard single-mode fiber (SSMF) using electronic predistortion (EPD) and the generation of optical
single sideband signals. A proof-of-principle experiment is described in which a single 10.7-Gb/s Mach–Zehnder
modulator drive signal with 4-bit amplitude resolution and 1-sample/bit temporal resolution was generated. This was
used as the input to Monte Carlo simulations to assess EPD transmission performance over SSMF links of up to 640 km.
© 2007 IEEE
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