High speed optical mixer for distribution of 16 QAM or QPSK data signals over 38 GHz

1997 
The authors demonstrate that an optoelectronic millimetre-wave (mm-wave) laser mixer operating at 38 GHz is capable of managing different modulation formats at different rates with the same identical operating conditions. This mixer is a relatively simple and compact optical source which integrates a wideband distributed transimpedance amplifier with a fast MQW VUG DFB laser. The mixer is fed with an electrical power of only 3 dBm at 7.6 or 9.5 GHz to provide the 38 GHz carrier. The device is capable of handling generated harmonics with either 16 QAM at 5 Mbit/s, QPSK at 60 Mbit/s or NRZ at 622 Mbit/s signals over 15 km fibre fed mm-wave radio systems without optical amplification.
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