Method and system for generating multi-frequency millimeter wave and applying same to multi-base station ROF communication system

Abstract

The invention discloses a method and a system for generating multi-frequency millimeter wave and applying the same to a multi-base station ROF (radio over fiber) communication system. The method comprises the following steps of: generating double sideband modulation in a central station by adopting a modulator and a radio-frequency source, coupling the double sideband modulation and one of carriers of different frequencies transmitted by a plurality of laser devices to a fiber channel, transmitting the double sideband modulation and the carrier to a base station, decomposing the carriers of two frequencies in the base station through a WDM (wavelength division multiplexer), generating four-wave hybrid frequency through a semiconductor optical amplifier, finally generating beat frequency by a detector to acquire millimeter wave, and transmitting the millimeter wave by an antenna. Antenna received data are modulated onto the carriers of different frequencies on an uplink and then transmitted to the central station, and the data are received by a receiver of the central station. The invention provides an effective path for generation and application of the millimeter wave in the multi-base station ROF system.

Description

technical field [0001] The invention belongs to the technical field of optical fiber wireless communication, and particularly relates to the generation of millimeter waves and the optical fiber wireless access technology of microwave over optical (ROF). Background technique [0002] In recent years, Internet services based on Internet Protocol (IP), such as distance education, video-on-demand and high-definition TV, have continued to grow, not only putting forward higher and higher requirements for the bandwidth capacity of existing networks, but also The flexibility of network networking puts forward new requirements, especially for broadband flexible access network technology. Therefore, the broadband access technology of optical fiber and wireless integration will be one of the preferred solutions for future access networks. Radio over Fiber (ROF, Radio over Fiber) system is the main technology of optical fiber wireless convergence, which is mainly composed of four parts:...

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Problems solved by technology

Regarding the method of generating millimeter waves using SOA, as disclosed on May 26, 2010, the publication number is 101713900A, and the Chinese invention patent publication titled "A Method and Device for Generating ROF System Millimeter Waves Using SOA" has been disclosed The millimeter-wave generation method realized by dual light sources, although the invention uses SOA to realize the millimeter-wave method and device in the ROF system, it does not support multi-base station communication, and the frequency utilization rate is low, and the millimeter-wave flexibility that the base station can select is relatively low. Difference

In the literature [All-optical frequency down-conversion for full-duplex WDM RoF systems utilizing an SOA-MZI, H.J.Song, M.Park, H.J.Kim, J.S.Lee, J.I.Song, 2005International Topical Meeting on Microwave Photonics, Seoul, Korea, Oct.2005, pp.12-14], the author proposed the method of using SOA-MZI to generate millimeter waves, and studied the performance of ROF system based on WDM, but the system did not realize the ROF system communication of multiple base stations, and adopted SOA-MZI MZI leads to higher cost

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