Microwave photon down conversion method and device based on electrooptical modulator and optical fiber raster

An electro-optical modulator and fiber grating technology, which is applied in optical fiber transmission, optical fiber radio, electromagnetic wave transmission systems, etc., can solve the problems of complex implementation methods of frequency conversion systems, limited functions, and the inability to realize frequency conversion functions of mobile communication base station access systems. The effects of offsetting dispersion, reducing complexity, and improving signal-to-noise ratio
CN1835422AInactive Publication Date: 2006-09-20ZHEJIANG UNIV
0 Cites 19 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2006-09-20
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

Abstract

Through electro optic modulator, local oscillation signal in double sideband is generated at controller of base station. Through filtering by grating of optical fiber, base station end obtains local oscillation signal in single sideband restrained by carrier. Through electro optic modulator, base station end carries out full photomixing between radio-frequency signal and local oscillation signal in single sideband. Through up going optical fiber link, the mixed optical signal is transferred to the controller of base station. Through photo detector and intermediate frequency filter, the controller of base station obtains signal in intermediate frequency of passing through down-conversion. Base station does not need local laser and local oscillation source of microwave, which are centralized at controller of base station. Thus, cost of system is lowered greatly. The invention prevents influence on quality of signal from effect of optical fiber dispersion, and raises SNR of system.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the field of optical communication and wireless communication, in particular to a microwave photon frequency down-conversion method and device based on an electro-optical modulator and a fiber grating. Background technique

[0002] In recent years, Radio over Fiber (RoF) technology has attracted widespread attention. RoF is an analog modulated subcarrier multiplexing technology. There are a wide range of applications in transportation systems. RoF is applied in wireless / mobile communication systems. It can move the baseband processing, modulation, and frequency mixing functions of the base station to the base station controller for centralized processing, while the base station only retains the functions of photoelectric conversion, filtering and amplification, which can greatly reduce the cost of the base station. In the future dense microcellular communication system, due to the large number of base stations, the use of RoF ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More