Full light sub carrier modulating device and method in optical fiber radio down chain
A fiber optic radio and downlink technology, applied in the field of optical communication, can solve the problems of difficult upgrading and high price, and achieve the effect of reliable performance, low cost and simple structure
Inactive Publication Date: 2008-07-30
TSINGHUA UNIV
View PDF0 Cites 8 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
For each millimeter-wave subcarrier channel, this method requires millimeter-wave devices and subsystems such as millimeter-wave mixers, millimeter-wave sources, millimeter-wave transmission lines, and electro-optical modulators in millimeter-wave bands, which are expensive and difficult to further improve.
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0054] Use the system shown in Figure 3 to simultaneously modulate multiple millimeter wave signals using the above-mentioned method. The subcarrier modulation module includes three parts: polarization rotation module, modulation module, and polarizer.
[0055] In the scheme, for each optical channel, the light source generates two beams of light, one wavelength is the carrier, which is not modulated, called carrier light; the other wavelength is the sub-carrier, it will be modulated, called sideband light; The polarization states of the beams are parallel and the phase difference is constant. The frequency difference between the two lights is equal to the frequency of the millimeter wave signal to be generated.
[0056] There are multiple implementations of the light source that meets the requirements in the scheme, which can be generated using the method in Figure 4, or an optical filter can be used to filter out two wavelength components from the output light of a supercontinuu...
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
Login to View More Abstract
The invention relates to an all-optical subcarrier modulation device in an optical fiber radio downlink and a method, which pertains to the optical communication technology field, in particular to the subcarrier phase modulation and the upward frequency conversion of the millimeter-wave optical fiber radio downlink. The invention mainly solves the relying on a millimeter-wave frequency mixer, a millimeter-wave source, a transmission line and other millimeter-wave devices and subsystems with the expensive prices and limited performances of the prior proposal. The invention proposes an all-optical signal processing technique, which controls the phase of a millimeter-wave subcarrier signal that is obtained by the detection via the control of the phase of one beam in the two beams of coherent-light, so as to realize the phase modulation of the millimeter-wave signal in an optical domain. The invention can reduce the bandwidth demand of a microwave source and an electro-optical modulator to one half to one-tenth at the same time of generating the millimeter-wave subcarrier phase modulation with the same effect, the upward frequency conversion of the millimeter-wave frequency mixer is not needed; only a section of millimeter-wave transmission line is needed between a detector and an antenna to avoid the usage of other high-frequency devices, so the system has simple structure, reliable performances and low cost.
Description
Technical field [0001] An all-optical sub-carrier modulation technology belongs to the field of optical communication technology, and particularly relates to sub-carrier modulation and up-conversion of millimeter wave optical fiber radio downlink. Background technique [0002] In recent years, wireless communications have developed rapidly. Wireless users have increased year by year, services have become more diversified, and data services have risen sharply, making the need for broadband wireless signals and carrier frequencies to expand to high-frequency millimeter wave frequency bands increasingly urgent. Electronic devices working in this frequency band are far from being able to meet the growth of future demand due to their cost, performance and other issues. The increasingly emerging optical fiber radio technology uses the broadband and low-loss characteristics of optical fiber technology to provide the necessary huge bandwidth for the transmission of various wireless servi...
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
Login to View More IPC IPC(8): H04B10/12H04B10/155H04J14/02H04L27/34H04B10/556
Inventor 郑小平李尚远宋怡桥张汉一周炳琨
Owner TSINGHUA UNIV