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A high linearity radio frequency optical transmission system and method

A transmission system and high linearity technology, applied in the field of radio frequency optical transmission, can solve problems such as nonlinear distortion of the system, and achieve the effects of improving linearization, improving sensitivity, and reducing noise figure

Inactive Publication Date: 2015-08-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is a nonlinear process to convert phase information into intensity information at the receiving end, which will still bring nonlinear distortion to the system.

Method used

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  • A high linearity radio frequency optical transmission system and method
  • A high linearity radio frequency optical transmission system and method
  • A high linearity radio frequency optical transmission system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] image 3 It is a structural schematic diagram of Embodiment 1 of the present invention. Such as image 3 As shown, in this embodiment, at the transmitting end, the RF signal source module 5 generates two angular frequencies ω 1 and ω 2 The sine wave signal, the two sine wave signals are combined into one through the electrical coupler and output to the RF signal power distribution module.

[0058] The radio frequency signal power distribution module 4 includes a third beam splitter 401 and an electrical attenuator 402, wherein:

[0059] Electric beam splitter 401, for the radio frequency signal S that radio frequency signal source module 5 produces RF Divided into two RF signals S 1 (t) and S 2 (t).

[0060] Electric attenuator 402, used to adjust the radio frequency signal S 1 (t) or S 2 (t) power. In this embodiment, it is used to change the radio frequency signal S 2 (t) power.

[0061] In order to facilitate the power distribution of the light source, the ...

Embodiment 2

[0101] Figure 4 It is a structural schematic diagram of Embodiment 2 of the present invention. Such as Figure 4 As shown, in this embodiment, except for the light source module 1 and the local oscillator light source module 6 , other modules are the same as those in the first embodiment.

[0102] The radio frequency signal source module 5 is consistent with that in Embodiment 1, and produces two angular frequencies respectively ω 1 and ω 2 The two sine wave signals are combined into one channel through the electric coupler and output to the radio frequency signal power distribution module 4 .

[0103] The radio frequency signal power distribution module 4 comprises the radio frequency signal S that the 3rd beam splitter 401 and electric attenuator 402 produce to radio frequency signal source module 5 RF Perform beam splitting and power adjustment. Similarly, in this embodiment, the radio frequency signal S is set 1 (t) the voltage is V 1 , RF signal S 2 The voltage is...

Embodiment 3

[0142] Figure 5 It is a structural schematic diagram of Embodiment 3 of the present invention. Such as Figure 5 As shown, in this embodiment, except for the light source module 1 and the local oscillator light source module 6 , other modules are the same as those in the first embodiment.

[0143] At the transmitting end, the radio frequency signal source module 5 is the same as that in Embodiment 1, and generates two angular frequencies respectively ω 1 and ω 2 The sine wave signal, the two sine wave signals are combined into one through the electrical coupler and output to the RF signal power distribution module.

[0144] The radio frequency signal power distribution module 4 comprises the radio frequency signal S that the 3rd beam splitter 401 and electric attenuator 402 produce to radio frequency signal source module 5 RF Perform beam splitting and power adjustment. Similarly, in this embodiment, the radio frequency signal S is set 1 (t) the voltage is V 1 , RF sign...

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Abstract

The invention discloses a high-linearity radio frequency light transmission system and method. Double parallel electro-optic phase modulators are adopted at a transmitting end, and two couplers and photoelectric balance detectors are adopted at a receiving end to perform coherent balance detection on two paths of modulation signals respectively; by controlling the light source power ratio and the radio frequency signal voltage ratio input into the two parallel phase modulators at the transmitting end, the powers of three-order intermodulation components of two paths of electric signals obtained by performing coherent balance detection on the two paths of modulation signals are enabled to be equal, and then the two paths of electric signals are subtracted by using an electric subtractor to counteract the three-order intermodulation components so as to realize full suppression of the three-order intermodulation components, thereby improving the linearity of the system. Meanwhile, since the coherent balance detection technology is adopted, the sensitivity of the system can be improved, and the relative intensity noise can be reduced so as to reduce the noise coefficient of the system.

Description

technical field [0001] The invention belongs to the technical field of radio frequency optical transmission, and more specifically relates to a high linearity radio frequency optical transmission system and method. Background technique [0002] The radio frequency optical transmission system is a transmission system that modulates the radio frequency signal and loads it into the optical carrier, and demodulates and restores the radio frequency signal at the receiving end after transmission through the optical fiber. It is an important part of the radio frequency microwave communication system. In recent years, with the rapid development of wireless communication technology, the application requirements of radio frequency optical transmission systems are also increasing rapidly. As a technology with very wide applicability, radio frequency optical transmission system has important application value in civil communication and national defense military, and its application cove...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/548H04B10/2543
Inventor 张崇富霍仰俊江宁邱昆
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA