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Also i want to add that Based on the device described in the previous section,it has implemented an optical– wireless transmission system. The dual wavelength laser was placed on a thermal controlled stage, and two DC input currents are provided. The two optical modes at the output of the Y-coupler were coupled into a lensed fiber followed by an optical isolator. An erbium-doped fiber amplifier (EDFA) amplified the
output signal, which was then modulated with a 1-Gb/s non-return-to-zero (NRZ) on-off keying (OOK) pseudorandom bit sequence (PRBS) data signal of N = 27-1 bits using a MachZehnder modulator (MZM). The modulated optical signal was amplified by a second EDFA, and then opto-electronically (O/E) converted by means of a packaged high-speed antennaintegrated traveling-wave uni-traveling carrier photodiode (TW-UTC-PD). The TW-UTC-PD was integrated with a broadband log-periodic antenna [13] and packaged with a 6 mm diameter Si-lens to provide a gain of approximately 10 dBi at 146 GHz. The receiver was a commercially available Schottky diode based subharmonicallypumped mixer (SHM), that down-converts wireless carrier waves within the 140 – 220 GHz band. Given this range, we have worked with a carrier wave frequency at 146-GHz. In conjunction with a 6x frequency multiplier, a low frequency signal generator was used to provide the mixer local oscillator (LO) signal required to achieve a 2.5 GHz intermediate frequency.
Try going through the paper it will be of very good help
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