Microwave binary digital modulation signal generation method based on dual-polarization quadrature phase shift keying modulator

Abstract

The invention discloses a microwave binary digital modulation signal generation method based on a dual-polarization quadrature phase shift keying modulator, relates to the technical field of optical communication, the technical field of microwaves and a digital frequency band transmission system, and mainly relates to generation of any binary digital modulation signal by utilizing a microwave photonics technology. The method is shown in figure 1 in the specification, and comprises a light source LD, a radio frequency source RF, a signal source AWG, the dual-polarization quadrature phase shift keying modulator DP-QPSK, a polarization controller PC, a polarization beam splitter PBS and a dual-parallel photoelectric balance detector BPD. After the DP-QPSK is modulated by the RF and the AWG, a correct bias point is set and the PC is adjusted, and then the BPD is injected, so that different required binary digital modulation signals can be obtained. The microwave binary digital modulation signal generation method is large in working bandwidth, high in frequency hopping speed, high in system stability, simple in structure, high in integration level and easy to implement.

Description

technical field [0001] The invention relates to the field of optical communication technology and microwave technology, and mainly relates to generating arbitrary binary digital modulation signals by using microwave photonics technology. Background technique [0002] Due to the complex structure of the electric domain system, large loss and limited bandwidth; compared with the electric domain, the generation of binary digital modulation signals in the optical field has the advantages of low loss, large bandwidth, anti-electromagnetic interference, simplicity and portability, and high system stability. [0003] The methods of generating amplitude keyed ASK signal, phase shift keyed PSK, and frequency shift keyed FSK signal in traditional light field can be generally divided into two categories: based on frequency-time mapping, direct space-time mapping and optical heterodyne structure; because the first two Its structure is bulky and lossy, so the optical heterodyne method ha...

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Problems solved by technology

[0005] At present, there are two main types of schemes for generating a variety of microwave binary digital modulation signals: one is based on optical pulse shaping, spectrum shaping and frequency-time mapping technology, and the other is based on optical heterodyne structure; the main disadvantages of the former scheme The generated signal frequency has a fixed factor relationship, and the cascade structure is more complex

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