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Method for suppressing third-order and fifth-order intermodulation distortion of microwave photon down-conversion link

A frequency conversion link, microwave photonic technology, applied in the field of optical communication

Active Publication Date: 2021-01-12
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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  • Method for suppressing third-order and fifth-order intermodulation distortion of microwave photon down-conversion link
  • Method for suppressing third-order and fifth-order intermodulation distortion of microwave photon down-conversion link
  • Method for suppressing third-order and fifth-order intermodulation distortion of microwave photon 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 third-order and fifth-order intermodulation distortion of a microwave photon down-conversion link, and the method comprises the following steps that:a laser emits a light beam, and the light beam is modulated by a local oscillation signal received by a third phase modulator and then is output, wherein the modulation of the third phase modulator iscontrolled by controlling the power of the local oscillation signal, so as to suppress the third-order and fifth-order intermodulation distortion; a signal modulated by the third phase modulator passes through a 3dB coupler, and the optical signal is divided into a first light beam and a second light beam, wherein the first light beam is modulated by a first phase modulator, then passes through afirst optical filter and is output to a first input end of the balance detector, so a first branch is formed; the second light beam is output to the second phase modulator after passing through the optical attenuator, is output to the second optical filter after being modulated by the second phase modulator, and is output to the second input end of the balance detector after passing through the second optical filter, so a second branch is formed.

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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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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