Serial-parallel connection modulation optical frequency multiplication millimeter-wave RoF (Radio Over Fiber) system and QPSK (Quadrature Phase Shift Keying) /16QAM (Quadrature Amplitude Modulation) modulation method thereof
An optical frequency doubling and millimeter wave technology, which can be used in phase modulation carrier systems, multi-carrier systems, electromagnetic wave transmission systems, etc., and can solve problems such as modulation signal interference.
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Embodiment 1
[0086] see figure 1 , the serial-parallel modulation optical frequency-multiplied millimeter wave RoF system of the present invention includes a central station 1 , a base station 2 and a downlink optical fiber 3 . The central station 1 and the base station 2 are connected by a downlink optical fiber 3, which is characterized in that the structure of the central station 1: a laser 1-1 is connected to a dual-electrode Mach-Zehnder optical modulator 1-4 through a polarization-maintaining pigtail The input end is connected; The RF electrode on an arm of the two-electrode Mach-Zehnder optical modulator 1-4 adds a cosine microwave signal output by a first microwave signal source 1-3, and the bias electrode is grounded; the other arm The RF electrode on the top is added with the cosine microwave signal generated by the first microwave signal source 1-3 and then phase-shifted by a π phase shifter 1-2, and the bias electrode is grounded; the two-electrode Mach-Zehnder optical modulato...
Embodiment 2
[0088] This series-parallel modulation optical frequency doubling millimeter wave RoF system QPSK / 16QAM modulation method adopts the above-mentioned system to operate, and is characterized in that: two RF electrodes of a two-electrode Mach-Zehnder optical modulator 1-4 input cosine and inverse respectively phase cosine microwave signal, the DC electrode bias electrode is grounded, and the phase modulation of the input light wave of the light source is performed with a large index, and a series of high-order side modes of light waves around the central wavelength are generated at the output port of the optical modulator 1-4. The frequency difference of adjacent modes is equal to the driving microwave frequency; the four RF electrodes of IQ optical modulator 1-5 input the random baseband digital signal and two phase-orthogonal intermediate frequency signals of I and Q branches respectively, and the two direct currents The poles 1-7, 1-10 are grounded, and at the same time, the DC...
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