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A 100-Gb/s high-speed optical transmitter is proposed and experimentally demonstrated.Based on frequency-quadrupling technique,two sub-channels with a fixed 50-GHz spacing are obtained from one laser source.Using return-to-zero differential quadrature phase-shift keying (RZ-DQPSK) modulation format and polarization multiplexing (PolMux),only low-speed electronic devices of 12.5 GHz are needed for the 100-Gb/s transmitter.This eliminates the need of ultrahigh-speed optoelectronic devices and thus greatly reduces the cost.The experimental results show that this transmitter can achieve good perfor- mance in dispersion tolerance of a 25-km single mode fiber (SMF).
A 100-Gb / s high-speed optical transmitter is proposed and experimentally demonstrated. Based on frequency-quadrupling technique, two sub-channels with a fixed 50-GHz spacing are obtained from one laser source. Using a return-to-zero differential quadrature phase-shift keying (RZ-DQPSK) modulation format and polarization multiplexing (PolMux), only low-speed electronic devices of 12.5 GHz are needed for the 100-Gb / s transmitter.This eliminates the need for ultrahigh-speed optoelectronic devices, greatly reduces the cost. The experimental results show that this transmitter can achieve good perfor- mance in dispersion tolerance of a 25-km single mode fiber (SMF).