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Suppression method of third-order and fifth-order intermodulation distortion in microwave photonic down-conversion link

A technology of frequency conversion link and microwave photon, which is applied in the field of optical communication to achieve obvious improvement effect and the effect of improving spurious-free dynamic range

Active Publication Date: 2022-04-08
AIR FORCE EARLY WARNING ACADEMY
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Problems solved by technology

[0005] Therefore, the present invention provides a method for suppressing the third-order and fifth-order intermodulation distortion of the microwave photonic down-conversion link, which not only uses a phase modulator to avoid the problem of bias point drift, but also solves the simultaneous realization of Problems with IMD3 inhibition and IMD5 inhibition

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  • Suppression method of third-order and fifth-order intermodulation distortion in microwave photonic down-conversion link
  • Suppression method of third-order and fifth-order intermodulation distortion in microwave photonic down-conversion link
  • Suppression method of third-order and fifth-order intermodulation distortion in microwave photonic down-conversion link

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[0045] In order to make the objects and advantages of the present invention clearer, the present invention will be further described below in conjunction with the examples; it should be understood that the specific examples described here are only for explaining the present invention, and are not intended to limit the present invention.

[0046] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention.

[0047] It should be noted that, in the description of the present invention, terms such as "upper", "lower", "left", "right", "inner", "outer" and other indicated directions or positional relationships are based on the terms shown in the accompanying drawings. The direction or positional relationship shown is ...

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Abstract

The invention relates to a method for suppressing the third-order and fifth-order intermodulation distortion of a microwave photon down-conversion link. The laser sends out a beam, which is modulated by a local oscillator signal received by a third phase modulator and then output. The magnitude of the power of the local oscillator signal is used to control the modulation of the third phase modulator, and the modulated signal of the third phase modulator divides the optical signal into a first light beam and a second light beam through a 3dB coupler, The first light beam is modulated by the first phase modulator and then subjected to the first optical filter, and output to the first input end of the balanced detector after passing through the first optical filter to form a first branch; the second The light beam is output to the second phase modulator after passing through the optical attenuator, output to the second optical filter after being modulated by the second phase modulator, and output to the balance The second input terminal of the detector forms a second branch.

Description

technical field [0001] The invention relates to the field of optical communication and the technical field of microwave photons, in particular to a method for suppressing third-order and fifth-order intermodulation distortion of a microwave photon down-conversion link. Background technique [0002] Microwave photonic technology is the use of optical technology to transmit, process and apply microwave signals. It combines the advantages of fine microwave technology and broadband photonic technology. have been widely applied. Microwave photonic link (MPL) is one of the important applications of microwave photonic technology. Because microwave photonic technology has the characteristics of wide operating frequency band, large instantaneous bandwidth, light weight, small size, and anti-electromagnetic interference, the radar system based on MPL design has unique advantages. The microwave photon frequency conversion link modulates the electrical signal and the local oscillator ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/2507H04B10/2575H04B10/556
CPCH04B10/2507H04B10/2575H04B10/5561
Inventor 张进张钧凯沃江海王亚兰王安乐罗雄
Owner AIR FORCE EARLY WARNING ACADEMY
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