Frequency octupling millimeter wave generation device by means of DP-QPSK modulator and method thereof

Abstract

The invention discloses a frequency octupling millimeter wave generation device by means of a double polarization-quadrature phase shift keying (DP-QPSK) modulator and a method thereof, relates to the technical fields of microwave and optical communication, and is mainly applied to generation of high-frequency millimeter wave. According to the method shown in the appended drawings, the device comprises a light source, a radio frequency signal source, the DP-QPSK modulator, a phase shifter, a power divider, a polarization controller, a polarizer and a photoelectric detector. The nonlinear characteristics and the interference superposition characteristics of the two sub-modulators X-QPSK and Y-QPSK of the DP-QPSK modulator are utilized, and polarization controller is properly adjusted when the two sub-modulators XI and XQ of X-QPSK and a main modulator work at the maximum point so that frequency octupling millimeter wave signals can be generated, the radio frequency index required by generation of high-frequency / extremely-high-frequency signals can be greatly reduced and thus system cost can be reduced. Use of a filter is avoided by the method, and frequency adjustment performance is great. Meanwhile, the generated signals are great in phase noise and frequency spectrum purity.

Description

technical field [0001] The present invention relates to the field of optical communication technology and microwave technology field, in particular to a method for generating octave-frequency millimeter-wave signals based on the relatively mature external modulation technology in optical communication technology. Background technique [0002] With the continuous advancement of science and technology, especially the rapid update of information technology, the generation technology of high-quality microwave signals with high spectral purity, high radio frequency stability, and low phase noise has become the key to microwave applications. High-quality microwave signals are widely used in many fields, such as radar systems, wireless communication systems, and electronic countermeasure systems. However, for traditional electronic technologies, the generation of millimeter-wave signals faces a bandwidth bottleneck, and transmission of millimeter-wave signals in coaxial cables or i...

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Problems solved by technology

[0004] The generation of high-frequency millimeter waves in the ROF system is a very critical issue. It is difficult or even almost impossible to complete the generation of very complex extremely high-frequency millimeter-wave signals with traditional electrical domain methods, mainly because crystal oscillators are generally used in the electrical domain. High-frequency millimeter-wave signals are generated by frequency multiplication and phase-locking. Due to the speed bottleneck of electronic devices and limitations of technology, it is difficult to generate high-frequency, high-quality signals.

In addition, using the electrical domain method to generate high-frequency millimeter-wave signals has very high requirements on the device, and the complex manufacturing process may greatly reduce the performance of the device

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