Device and method for generating quadruple-frequency optical-carried millimeter-wave bpsk vector signal

Abstract

The invention discloses a device and a method for generating a quadruplicated frequency optical millimeter wave BPSK vector signal. The device comprises a laser LD, an RF radio frequency signal generator, an electric phase modulator, a phase shifter, an electric gain device, an integrated modulator, a single-mode optical fiber and a photoelectric detector. The method comprises: modulating light waves emitted by a laser LD by a radio frequency signal carrying data through an integrated modulator; adding two paths of signals output by the upper arm and the lower arm of the integrated modulator to generate a 4k-1 order sideband, and after optical fiber transmission, a positive 3 order sideband and a negative 1 order sideband generating quadruplicated frequency millimeter wave signals at the beat frequency of a photoelectric detector PD; a data signal carrying out phase modulation on a radio frequency signal generated by the RF signal generator through the electric phase modulator PM, andadding the radio frequency signal subjected to data phase modulation and the gained data signal to drive the two sub-modulators. According to the invention, the bandwidth requirements on the radio frequency device and the MZM modulator can be reduced, the tunability is realized, and the system is stable and easy to realize.

Description

technical field [0001] The invention relates to the field of photoelectric signal processing methods, in particular to a device and method for generating quadruple-frequency optical-carried millimeter-wave BPSK vector signals. Background technique [0002] With the rapid development of the information society, users have put forward higher requirements on the bandwidth and rate of wireless communication access. Millimeter wave communication has become a strong competitor of broadband wireless communication because of its high bandwidth and high speed. The 60GHz frequency band will become the preferred frequency band for WLAN. Optical fiber wireless communication RoF technology combines the advantages of large bandwidth of optical fiber communication and flexible wireless communication access, etc., and can improve the transmission distance of millimeter wave communication. However, limited by the low frequency response of the lithium niobate Mach-Zehnder modulator (MZM), i...

AI Technical Summary

Problems solved by technology

[0004] However, there are some shortcomings in the above-mentioned method of generating quadrupled frequency optical carrier millimeter-wave vector signal

Using the integrated modulator approach requires a specific modulation index to generate the desired mmWave vector signal on optical, limiting the flexibility and tunability of the scheme

Precoding in the precoding + Mach-Zehnder modulator scheme greatly increases the complexity of the modulator driving circuit and reduces the stability of the system

The optical filter + Mach-Zehnder modulator method needs to use an additional optical filter to suppress unwanted optical sidebands, which will hinder its application in wavelength division multiplexing WDM-RoF systems and up-conversion systems, and also increases system complexity and limits its tunability across the mmWave band

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