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M2-QAM RF signal generation method and system of intensity modulator based on polarization multiplexing

An intensity modulator and polarization multiplexing technology, applied in transmission systems, electromagnetic wave transmission systems, electromagnetic transmitters, etc., can solve problems such as complex structures and instability, achieve high modulation efficiency, reduce system costs, and improve modulation efficiency Effect

Pending Publication Date: 2020-09-01
FUDAN UNIV
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Problems solved by technology

However, the current methods all have the disadvantages of complex structure and instability

Method used

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  • M2-QAM RF signal generation method and system of intensity modulator based on polarization multiplexing

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Embodiment Construction

[0019] In order to make the technical means, creative features, goals and effects of the present invention easy to understand, a two-dimensional quadrature amplitude modulation (M 2 -QAM) radio frequency (RF) signal generation method and system are described in detail.

[0020]

[0021] In this embodiment, a two-dimensional quadrature amplitude modulation (M 2 -QAM) radio frequency (RF) signal generation method and system are described in detail.

[0022] figure 1 is the two-dimensional quadrature amplitude modulation (M 2 - Schematic diagram of the structure of the QAM) radio frequency (RF) signal generation system.

[0023] Such as figure 1 As shown, the two-dimensional quadrature amplitude modulation radio frequency signal generation system includes: a radio frequency source 1, a laser 2, a first data source 3, a second data source 33, a phase shifter 4, a first mixer 5, a second mixer Device 55, polarization multiplexing intensity modulator 6 and photodetector 7.

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Abstract

The invention belongs to the technical field of optical fiber-wireless communication systems, and provides an M2-QAM RF signal generation method and system of an intensity modulator based on polarization multiplexing. The method comprises the steps: generating laser light by using a laser, generating two paths of sine wave radio frequency signals through a radio frequency source; enabling one pathto generate phase shift through a phase shifter; generating a baseband signal of a digital domain by using a digital source; modulating a baseband signal to a radio frequency signal by using a mixer,driving a polarization multiplexing intensity modulator by using a mixed analog signal to modulate laser to generate a double-sideband optical signal, and performing frequency beat on the generated double-sideband optical signal by using a photoelectric detector to generate an M2-QAM signal. The system has the advantages of simple structure, low complexity, low cost and high modulation efficiency, can generate a double-rate signal, has small signal loss, and can transmit for a long distance in a dispersion shift optical fiber. According to the invention, the bandwidth requirement of an electronic device at a transmitting end can be reduced, thereby effectively reducing the system cost.

Description

technical field [0001] The invention belongs to the technical field of optical fiber-wireless (Radio-over-Fiber, ROF) communication systems, and in particular relates to an intensity modulator based on polarization multiplexing 2 -QAM RF signal generation method and system. Background technique [0002] With the emergence of new technologies such as artificial intelligence and the Internet of Things and the development of smartphones, the Internet has developed to a new stage. Multimedia applications based on mobile terminals are constantly emerging, and their main features are high bandwidth and low delay requirements. Therefore, wireless communication should also develop towards greater system capacity and lower latency. Now, the fifth-generation wireless transmission technology (5G) has developed to the millimeter wave frequency band to utilize more spectrum resources. As we all know, the fiber-optic (ROF) technology has the advantages of low cost, low loss and large b...

Claims

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Application Information

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IPC IPC(8): H04B10/2575H04B10/516H04B10/54
CPCH04B10/2575H04B10/54H04B10/5165Y02D30/70
Inventor 余建军朱博文
Owner FUDAN UNIV
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