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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

Inactive Publication Date: 2006-09-20
ZHEJIANG UNIV
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Problems solved by technology

Among the above methods, the frequency conversion system based on coherent lasers and the frequency conversion system of Brillouin lasers are more complicated to implement, and the cost for dense micro-cellular mobile communication systems is relatively high, while the above-mentioned frequency conversion method based on electro-optic modulators, although the cost is relatively low , but the realized function is limited, only the frequency conversion signal can be generated locally, but the frequency conversion function of the uplink optical fiber link of the mobile communication base station access system cannot be realized

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

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with drawings and embodiments.

[0020] figure 1 It is a structural schematic diagram of the electro-optic modulator and the microwave photon down-conversion device of the fiber grating of the present invention. figure 1 The solid line in the center represents the optical signal link, and the dotted line represents the electrical signal link. figure 1 The dashed box on the left in the center represents the device at the base station controller, and the dashed frame at the right represents the device at the base station. The functions of the base station controller end device mainly include: modulate the microwave local oscillator signal onto the optical carrier and provide it to the remote base station, receive the optical signal from the base station after optical mixing and filter out the intermediate frequency signal. The main functions of the base station device include: using fiber grating to co...

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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.

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 ...

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Application Information

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IPC IPC(8): H04B10/12H04B10/18H04B10/2531H04B10/2575
Inventor 池灏章献民
Owner ZHEJIANG UNIV
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