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The effects of cascaded optical filtering on 10 Gsymbol/s DPSK and DQPSK signals are mitigated by pre-compensation based on the use of digital signal processing to generate the drive signals for a dual-parallel Mach-Zehnder modulator.
For 40-Gb/s NRZ-DPSK and RZ-DPSK transmission, we demonstrate experimentally that tight optical filtering enhances the system degradation caused by the imperfect frequency response of a dispersion compensating fiber Bragg grating.
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