Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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 system, etc., can solve the problems of complex implementation method of frequency conversion system, limited functions, and inability to realize the frequency conversion function of mobile communication base station access system. The effect of offsetting dispersion, reducing complexity, and improving signal-to-noise ratio

Inactive Publication Date: 2009-09-02
ZHEJIANG UNIV
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

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

PUM

No PUM Login to View More

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 ...

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

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/12H04B10/18H04B10/2531H04B10/2575
Inventor 池灏章献民
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com