Device for Generating Octave-Frequency Millimeter Waves Using a Sagnac Loop Embedded in an IM Modulator and a DPMZM Modulator in Cascade

Abstract

The invention discloses a device cascading an embedded intensity modulator (IM) Sagnac ring with a DPMZM modulator so as to form 8-frequency multiplication millimeter waves, relates to the microwave technical field and optical communication technical field, and mainly is applied to the high frequency millimeter wave generation; the device comprises a light source, a polarization controller, a circulator, a polarization beam combiner, a polarizer, a radiofrequency signal source, an IM modulator, a DPMZM modulator, an electric branching unit, a phase shifter and a photoelectric detector; the IM modulator and a sub-modulator MZM1 of the DPMZM modulator respectively work at the minimum point, and the main modulator MZM3 of the DPMZM modulator works at the minimum point. The DC bias of a sub-modulator MZM2 of the DPMZM modulator can be reasonably set, thus forming the 8-frequency multiplication millimeter wave signal. The method can greatly reduce the radio frequency index needed in forming the high frequency signal, thus further reducing the system cost; in addition, the method can prevent the filter usage, has very well frequency adjusting property, and the formed signal phase noise is low and frequency spectrum purity is high.

Description

technical field [0001] The present invention relates to the technical field of optical communication and microwave technology, and in particular to a device for generating an octave-frequency millimeter-wave signal based on a 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 in t...

AI Technical Summary

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 for traditional electrical domain devices to complete the generation of very complex extremely high-frequency millimeter wave signals, 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 in technology, it is difficult to generate high-frequency, high-quality signals.

In addition, the use of electrical domain devices to generate high-frequency millimeter-wave signals has very high requirements on devices, and complex manufacturing processes may greatly reduce the performance of devices

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