Method for generating millimeter wave optical fiber down link device and its frequency tunable millimeter wave
A downlink, millimeter wave technology, applied in optical fiber transmission, electromagnetic wave transmission systems, electrical components, etc., can solve the problems of complex downlink structure and high cost
Inactive Publication Date: 2011-08-31
SHANGHAI UNIV
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Problems solved by technology
[0007] The purpose of the present invention is to solve the problem that the downlink structure of the existing millimeter-wave optical fiber transmission system is complicated, the cost is high, and it is difficult to generate a frequency-tunable millimeter-wave signal, and to provide a downlink structure of the millimeter-wave optical fiber transmission system and a frequency-tunable mm wave generation method, tuning is achieved by changing the wavelength of the laser
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[0076] A preferred implementation example of the present invention is: see figure 1 , the downlink device of the millimeter wave optical fiber transmission system includes a central station 1, a base station 2 and an optical fiber 3, and the central station 1 and the base station 2 are connected through the optical fiber 3. In the central station 1, a first laser 1-1 is connected to a polarization controller 1-2 through a pigtail, and the polarization controller 1-2 is connected to a two-electrode Mach-Jeandel modulator through an optical fiber The input terminals of 1-4 are connected. The digital baseband signal 1-3 and the radio frequency signal 1-8 are respectively input to the two electrodes of the two-electrode Mach-Jendel modulator 1-4. The output end of the two-electrode Mach-Jeandel modulator 1-4 is connected to a section of polarization-maintaining optical fiber 1-5, and the output end of the polarization-maintaining optical fiber 1-5 is connected to port 2 of the ci...
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The invention relates to the down-link structure of a millimeter-wave fibre-optic transmission system and a method for generating millimeter waves with tunable frequencies. In the down-link structure of the millimeter-wave fibre-optic transmission system, double lasing light emitters are arranged in a key station, a first light wave passes through a double electrode Mach-Zehnder modulator, and a light carrier which carries digital baseband signals and comb spectral components which are spaced by the frequency of radio-frequency signals are generated at the output end of the modulator. A second light wave which passes through a circulator is taken as pump light and is injected into a polarization-preserving fiber in a reverse direction, the frequency of the second light wave is changed so as to amplify the comb spectral components of corresponding frequency points in the first light wave through stimulated Brillouin effect, and millimeter-wave signals with the corresponding frequenciescan be generated at a photodetector on a base station. As the millimeter-wave signals are modulated by the digital baseband signals, the down transmission of information needed from the key station to the base station is realized. The RoF down-link has simple structure and realizes the purpose of simultaneously transmitting the digital baseband signals and the radio-frequency signals by utilizingone double electrode Mach-Zehnder photomodulator.
Description
technical field [0001] The present invention relates to a downlink structure of a millimeter-wave optical fiber transmission system and a method for millimeter-wave generation and millimeter-wave frequency tuning therein. A new downlink structure of the millimeter-wave optical fiber transmission system is proposed here. Dual light sources are introduced into the central station, and one channel of light waves passes through a dual-electrode Mach-Jeandel optical modulator to generate modulation signals and comb-shaped optical signals, and the other channel The light wave is reversely injected into the polarization-maintaining fiber as the pump light, and stimulated Brillouin scattering is generated to amplify the light wave at a certain frequency point in the comb spectrum. After the light wave is transmitted to the base station through the optical fiber, the photoelectric conversion generates the required millimeter wave signal, and the millimeter wave signal contains modulate...
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IPC IPC(8): H04B10/155H04B10/158H04B10/17H04B10/25
Inventor 陈昊硕林如俭叶家俊张冬朱渝林
Owner SHANGHAI UNIV