Optical frequency-doubling millimeter wave RoF signal generation system and method of OFDM modulation mode
An optical frequency doubling and signal generation technology, which is applied in the modulation carrier system, electromagnetic wave transmission system, optics, etc.
Inactive Publication Date: 2012-05-16
SHANGHAI UNIV
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Problems solved by technology
There are still relatively few studies on the use of OFDM modulation in millimeter-wave RoF signal generation systems, and the use of optical frequency doubling to generate millimeter-wave signals is still a relatively new concept, so it is necessary to invent an optical frequency doubling of OFDM modulation Millimeter wave RoF signal generation system, which not only generates millimeter waves from light waves, but also modulates OFDM signals onto millimeter waves
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[0048] A preferred implementation example of the present invention is described as follows in conjunction with accompanying drawing:
[0049] see figure 1 , the optical frequency doubling millimeter-wave RoF signal generating system of the OFDM modulation mode includes a central station 1, a base station 2 and a downlink optical fiber 3, and the central station 1 and the base station 2 are connected by a downlink optical fiber 3, and it is characterized in that: the described The structure of the central station 1: the laser 1-1 is connected to the input end of a two-electrode Mach-Zehnder optical modulator 1-2 through a polarization-maintaining pigtail, and the RF on one arm of the two-electrode Mach-Zehnder modulator 1-2 The electrode adds the cosine microwave signal output by the cosine microwave signal source 1-3, and the RF electrode on the other arm adds the negative cosine generated by the cosine microwave signal source 1-3 and shifted by the π phase shifter 1-4 For th...
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The invention relates to an optical frequency-doubling millimeter wave RoF signal generation system and a method of an OFDM modulation mode. The system comprises a central station and a base station, wherein the central station comprises a laser, a double-electrode Mach-Zehnder optical modulator, a cosine microwave signal source, a pi phase shifter, a light intensity modulator IM, an OFDM signal source, a bias pressure controller and an EDFA optical fiber amplifier. The base station comprises an optical detector, a pre-posed low-noise amplifier, a band-pass filter, a millimeter wave amplifierand a millimeter wave transmitting antenna. The method utilizes an optical frequency-doubling method to generate a millimeter wave signal, generates a millimeter wave from an optical wave, also modulates OFDM signals on the millimeter wave and generates the OFDM signals modulated on the upper side frequency and the lower side frequency of each sub-harmonic on the base station. The invention has simple system structure, stable property and easy realization.
Description
technical field [0001] The present invention relates to an optical signal generation system and method for optical fiber communication, in particular to an OFDM modulation optical frequency-multiplied millimeter wave RoF signal generation system and method. technical background [0002] The fourth generation mobile communication system (4G or later 3G) will be a milestone in the development of the communication industry. It can not only provide high-quality, large-bandwidth service quality, but also realize ubiquitous real-time multimedia business services. Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier digital modulation technology. OFDM technology is recognized as the core technology of 4G due to its strong anti-interference ability, high spectrum utilization rate, and large transmission capacity. Millimeter-wave RoF, as a transmission technology of wireless signals in optical fiber media, is also considered to be one of the networking technologies of...
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IPC IPC(8): H04L27/00H04B10/12G02F1/00H04B10/255H04B10/556
Inventor 李一林如俭李迎春叶家俊邹是桓
Owner SHANGHAI UNIV