In the experiments, by employing several MZMs, lasers and other optical devices, 4ASK and 16QAM signals with 25GHz carrier and 1.8GBaud symbol rate were generated successfully through optical approaches. In the numerical simulation, the analysis of the generation of 16ASK signal with 40GHz carrier employing microwave PVM technology was proposed.(2) The microwave PVM technology for DPASK and Star QAM signal generation based on Electro-optical ugg boots 2010 phase modulator (EOPM)Based on the of EOPM whose modulation characteristic is sensitive to the velocity of the input light, two architectures for DPASK and Star QAM signal generation were proposed. In the experiments, firstly a 12.5GHz clock from the local oscillator was modulated on the 1539.9nm best clothes blog optical carrier via a MZM with 20GHz bandwidth at its double-sideband carrier-suppression (DSB-CS) mode. Then, the upper and lower sidebands are separated by an optical interleaver with 25/50GHz channel spacing and injected into the EOPM with opposite directions. For the reason that EOPM is a velocity-matched device, there cheap nike shoes was a phase difference which was proportional to the applied 2Gbits/s phase signal between the upper and lower sidebands. After a MZM with 10GHz bandwidth which was employed to modulate the 2Gbits/s amplitude signal, at the receiver side, DPASK signal with 25GHz carrier was finally generated. By simply adding the amplitude information in proper proportion to the phase signal to form the driven signal of EOPM, the star QAM signal can also be generated.
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