Microwave photonic zero-intermediate-frequency receiving device and method

Abstract

The invention discloses a microwave photonic zero-intermediate-frequency receiving device and method. The method relates to the technical field of microwave and the technical field of optical communication. The method is as shown in the drawings. The device comprises a laser (LD), a polarization multiplexing Mach-Zehnder modulator (PDM-MZM), an erbium-doped optical fibre amplifier (EDFA), a wavelength division multiplexer (WDM), polarization controllers (PCs), a polarization beam splitter (PBS) and balance photoelectric detectors (BPDs). Modulation and polarization multiplexing of radio-frequency (RF) and local oscillator (LO) signals are carried out by utilization of the PDM-MZM; the WDM separates upper and lower optical sidebands; the PCs are respectively utilized for adjusting the polarization states of optical signals; and finally, the two BPDs respectively output I-channel and Q-channel baseband signals. By means of the microwave photonic zero-intermediate-frequency receiving device and method disclosed by the invention, zero-intermediate-frequency receiving is realized through a photonic method; the electronic bottleneck in the traditional electric field technology can be overcome; and the microwave photonic zero-intermediate-frequency receiving device has the advantages of being wide in working band, high in IQ balance degree, inhibited in direct-current offset and even-order distortion, electromagnetic-interference-resistant and the like.

Description

technical field [0001] The invention relates to the field of microwave technology and the field of optical communication technology, and mainly relates to the realization of zero-IF reception of broadband microwave vector signals through microwave photon technology. Background technique [0002] As people's requirements for communication rates are getting higher and higher, electronic communication systems are now developing in the direction of high-frequency bands and large bandwidths. In the traditional signal processing technology based on electronics, there are speed bottlenecks in electronic devices, large timing jitter, and serious electromagnetic interference. Photonics signal processing technology has a series of advantages such as simplicity, portability, wide bandwidth, and anti-electromagnetic interference, and has attracted much attention. [0003] Most of the current electronic systems use a superheterodyne receiver architecture. The microwave vector signal rec...

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Problems solved by technology

This structure has the following disadvantages: (1) When the frequency of the RF signal is high, one or two stages of down-conversion are often required. After each stage of frequency conversion, it is generally necessary to use a band-pass filter to filter out the down-converted intermediate frequency signal for post-processing. The structure is complex; (2) In the process of down-converting to intermediate frequency signals, image interference is difficult to suppress, which seriously reduces system performance; (3) When the vector signal bandwidth is very large, the analog-to-digital converter is required to have a higher sampling rate and operating frequency , the current analog-to-digital conversion technology is difficult to meet

However, most of the current microwave photon technologies are oriented to superheterodyne receivers, and there are few reports on microwave photon zero-IF receiving technology

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