A Method of Electric Vector Millimeter Wave Generation Based on Push-Pull Modulator

Abstract

The invention discloses a method for generating an electric vector millimeter wave based on a push-pull modulator. The electric vector millimeter wave generating system includes a digital signal processor, an external cavity laser, a push-pull modulator and a DC bias voltage source; the digital signal processor The output terminal of the first analog-digital converter and the second analog-digital converter are connected, and the output terminals of the first analog-digital converter and the second analog-digital converter are respectively connected with the first radio frequency driver and the second radio frequency driver, push-pull The first phase modulator and the second phase modulator in the modulator are respectively connected to the output ends of the first radio frequency driver and the second radio frequency driver, and the output ends of the push-pull modulator are sequentially connected with an optical amplifier, an optical filter, a photodetector and a millimeter-wave amplifier, the output of the millimeter-wave amplifier is connected with an antenna for transmitting electric vector millimeter-wave signals. The invention can be effectively applied in ROF communication to generate wireless electric vector millimeter wave signals, has good use effect and is convenient for popularization and use.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a method for generating an electric vector millimeter wave based on a push-pull modulator. Background technique [0002] Optical fiber communication has the characteristics of long transmission distance and large communication capacity, but due to wired transmission, it cannot achieve comprehensive coverage of wide areas. Wireless communication can theoretically achieve full geographical coverage, but limited to spectrum resources, its transmission capacity and transmission distance are limited. Radio-over-fiber (ROF) combines the advantages of optical fiber communication and wireless communication, and has the advantages of long transmission distance, large transmission capacity, and real-time communication with mobile terminals. W band (75GHz-110GHz) and terahertz band (100GHz-10THz) have large spectral bandwidth, and it is easy to generate electric vector sig...

AI Technical Summary

Problems solved by technology

In the prior art, the ultra-wideband ROF system application has been realized by using the IQ modulator through single sideband modulation. However, due to the large insertion loss of the IQ modulator, there are many DC bias voltage points, generally three, and the optical signal The power loss is relatively large, and the optical signal needs to be relayed and amplified in the system

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