The Project (HIT.NSFIR.2011131) was supported by the Natural Scientific Research Innovation Foundation in Harbin Institute of Technology, and the National Natural Science Foundation of China under grant no. 61205046, and Shenzhen Municipal Science and Technology Plan Project (contracts JCYJ20120613150130014, JC201105160592A and JC201005260185A).
We propose a reconfigurable 8PSK/8QAM modulator implementation by employing two cascaded QPSK modulators with an interferometer in between. With simple control of bias voltage of the interferometer, a flexible switchi...
supported by the National Basic Research Program of China (2010CB327505)
The design and measured results of a broad-band direct quadrature phase shift keying(QPSK) modulator and demodulator are described in this paper.The circuits are fabricated using 1-m GaAs HBT technology.To suppress th...