A Spurious Free Dynamic Range Improvement Method Based on Single Sideband Modulation

A single-sideband modulation and dynamic range technology, applied in the field of optical communication, can solve problems such as periodic power attenuation, achieve the effect of improving the suppression problem and improving the spurious-free dynamic range

CN111901043BActive Publication Date: 2021-08-03AIR FORCE EARLY WARNING ACADEMY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-08-03

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Abstract

The present invention relates to a method for improving the spurious-free dynamic range based on single sideband modulation, comprising: step 1: the laser emits an optical carrier S1; step 2: the radio frequency input signal S2 modulates the optical signal S1 output by the laser through a phase modulator, thereby Obtain and output the phase modulation signal S3; Step 3: After the phase modulation signal S3 passes through the third-order intermodulation distortion suppressor, output the SSB phase modulation signal S4 with a certain carrier-to-sideband ratio; Step 4: The photodetector demodulates the signal S4 The suppression of the third-order intermodulation distortion in the output radio frequency signal S5 is realized, and the output signal of the optical band detector is input into a spectrum analyzer for analysis. Wherein, the third-order intermodulation distortion suppressor obtains the SSB signal of the optical carrier and the +2nd-order sideband amplitude 1:9 after the amplitude-frequency processing of the signal, and extracts the signal by the photodetector in the step 4 , used to increase the spurious-free dynamic range of a spurious-free dynamic range link.
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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 improving the spurious-free dynamic range based on single-sideband modulation. Background technique

[0002] Microwave photonics technology, MWP, Microwave Photonics, uses optical technology to transmit, process and apply microwave signals, combining the advantages of microwave technology fineness and photon technology broadband, in satellite communications, radio and television, optically controlled phased array antennas and navigation, etc. It has been widely used in many military and civilian fields. Radio-over-fiber system, ROF: radio-over-fiber, is one of the important applications of microwave photonic technology, usually composed of central office, optical fiber link and remote antenna unit. ROF modulates radio frequency signals onto optical signals and transmits them through optical fibers, and finally demodul...

Examples

Embodiment Construction

[0038] 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.

[0039] 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.

[0040] 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 ...