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.
CN101964683BInactive Publication Date: 2013-05-08SHANGHAI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI UNIV
Publication Date
2013-05-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a serial-parallel connection modulation optical frequency multiplication millimeter-wave RoF (Radio Over Fiber) system and a QPSK (Quadrature Phase Shift Keying) / 16QAM (Quadrature Amplitude Modulation) modulation method thereof. The system comprises a central station, a base station and fiber connection thereof, wherein the central station comprises a single longitudinal mode laser, a double-electrode Mach-Zehnder optical modulator, an IQ optical modulator, two microwave signal sources, a pi phase shifter, a pi / 2 phase shifter and an erbium doped fiber amplifier; and the base station comprises an optical detector, a front low-noise amplifier, two millimeter-wave bandpass filters, two millimeter-wave amplifiers, a millimeter-wave duplexer and a millimeter-wave antenna. In the method, the cascading of the double-electrode Mach-Zehnder optical modulator and the IQ optical modulator is adopted, and a balanced optical waveguide structure formed by integrating the two optical modulators avoids the influence of optical source phase interference noise caused by support arm optical delay inequality on modulation signals.
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Description

Technical field:

[0001] The invention relates to a Radio over Fiber (RoF, Radio over Fiber) system and QPSK and 16QAM modulation methods. The purpose of adopting QPSK and 16QAM signal format is to compress the occupied bandwidth of the signal. A RoF system structure based on the principle of optical frequency doubling and a new series-parallel optical modulation method are proposed. While generating millimeter waves from light waves, it is possible to transfer the modulation of the signal to the light waves to the modulation of the millimeter waves. technical background:

[0002] Regarding how to apply the optical QPSK modulation mode to the millimeter-wave RoF system, in the prior art, two independent optical fiber links are used to transmit the I-channel and Q-channel information of the QPSK signal respectively. Although this method can realize 16-QAM or higher PSK modulation, the two optical fiber links require two sets of independent electro-optic modulation equipment, ...

Claims

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