Tunable microwave signal generation system with high intermodulation distortion inhibition degree
An intermodulation distortion and microwave signal technology, which is applied in the direction of eliminating distortion/dispersion, optical fiber transmission, optical fiber radio, etc., to ensure high bandwidth, realize intermodulation distortion, and suppress third-order intermodulation distortion.
Active Publication Date: 2015-11-11
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology
The generation of microwave photonic high-frequency signals only focuses on the generation of single-frequency high-frequency radio frequency electrical signals, and does not involve the simultaneous generation and distortion suppression of multi-frequency high-frequency radio frequency electrical signals. The research on the high linear regeneration and transmission of multi-channel broadband radio frequency electrical signals is Concentrate on the high linear transmission of multi-frequency radio frequency electrical signals, and do not involve the research on multi-frequency high-frequency radio frequency electrical signals generated after multi-frequency radio frequency electrical signals are reused
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[0054] In the present embodiment, the intermodulation interference suppression ability of the present invention has been tested and verified and analyzed, and the analysis results are as follows Figure 4~7 shown. in, Figure 4 Both the first sub-modulators MZM1 and MZM2 work at the orthogonal point (90°), that is, the spectrogram of the dual-tone signal obtained when the DPMZM works in the quadrature modulation mode. Figure 5 It is a panorama of the frequency spectrum of the multiplied signal using the dual-channel broadband radio frequency signal of the present invention. Figure 6 It is a frequency spectrum diagram of the intermodulation distortion suppression test of the double-channel broadband radio frequency signal of the present invention. Figure 7 The electrical signal spectrum adopting the ultra-high third-order intermodulation distortion suppression characteristic of the present invention.
[0055] From Figure 4 It can be seen that there are various types of ...
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The invention provides a tunable microwave signal generation system with a high intermodulation distortion inhibition degree, and the system comprises a laser, a microwave source, a phase control and synthesis unit, a DC bias control unit, a DPMZM, and a photoelectric detector. The DPMZM (dual parallel Mach-zehnder modulator) comprises three MZMs (Mach-zehnder modulators): a first sub MZM1, a second sub MZM2, and a main modulator. The first sub MZM1 and the second sub MZM2 are respectively embedded on two arms of the main modulator, and have the same performance and structure. The system generates a tunable microwave signal with the high intermodulation distortion inhibition degree through the effective inhibition of intermodulation distortion, meets the demands of high linearity of broadband microwave photon communication, and guarantees the high bandwidth and large dynamic range of a broadband microwave photon communication system.
Description
technical field [0001] The invention relates to the field of microwave photon technology, in particular to a tunable microwave signal generation system with high intermodulation distortion suppression. Background technique [0002] With the development of global information socialization technology and satellite communication technology, it is necessary to rapidly improve different types of broadband services including cellular phones, digital broadcasting services, and video services. At present, low-frequency radio frequency signals with spectrum congestion are mainly used, and it is difficult to break through the bandwidth and The bottleneck of the transmission rate must use radio frequency electrical signals with higher operating frequency to realize the transmission and processing of broadband or even ultra-wideband radio frequency electrical signals, so this requires the generation of high frequency radio frequency electrical signals. In addition, the broadband communi...
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IPC IPC(8): H04B10/2507H04B10/2575
Inventor 蒋炜谭庆贵梁栋秦伟泽李小军朱忠博马海虹幺周石
Owner XIAN INSTITUE OF SPACE RADIO TECH