Optical mm wave generating and wavelength reuse method and system in all-duplex communication radio Over-Fiber

An optical millimeter wave and generation method technology, applied in the field of optical fiber-wireless communication systems, can solve the problems of unsolved signal fading effect, short transmission distance, low transmission signal rate, etc., and achieves simple structure, reduced cost, and extended transmission distance. Effect

Inactive Publication Date: 2007-07-18
HUNAN UNIV
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Problems solved by technology

[0007] For the generation of optical millimeters mentioned above and the wavelength reuse of the uplink, the existing technical solution is to use double sideband modulation [A.Kaszubowska, L.Hu, L.P.Barry, "RemoteDownconversion with wavelength reuse for the radio/fiber uplinkconnection" IEEE Phot

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  • Optical mm wave generating and wavelength reuse method and system in all-duplex communication radio Over-Fiber
  • Optical mm wave generating and wavelength reuse method and system in all-duplex communication radio Over-Fiber

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Embodiment Construction

[0062] The present invention will be specifically described below in conjunction with experimental examples and accompanying drawings.

[0063] As shown in Figure 1, the components of the optical millimeter wave generation module are described as follows:

[0064] Laser 1 is used to generate a single longitudinal mode optical signal of a specified wavelength, which can be DFB-LD; dual-electrode modulator 2 is used to generate carrier-suppressed modulation signals, which can be modulated by double-electrode lithium niobate (D-LN-MOD) The device can also be a dual-electrode absorption intensity modulator; the driving signal of the dual-electrode modulator 2 in this embodiment is an RF signal with a repetition frequency of 20 GHZ generated by the RF signal source 3, and can also be a higher frequency.

[0065] The frequency spectrum of the carrier suppression signal generated in this embodiment is shown in FIG. 2 .

[0066] Optical cross multiplexer 4, its effect is to separate ...

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Abstract

This invention discloses a method and a system for generating and re-using full light millimeter waves of full duplex communication and re-using wave lengths in the Radio-on-Fiber ROF communication system, which applies a carier suppression method by double pole modulator and filters by an optical filter to separate two vertical modes of a carrier suppression signal, one of which is modulated in its baseband signals and couples to the other one un-modulated to generate optical millimeter waves to simplify, stabilize the structure of the central station at low cost, and an optical filter is used in the base station to filter out the vertical mode with un-modulated signals as the optical carrier of up link and realizes repeatedly using the wavelength in down-link in the up link so that light source is not used any more in the base station and the structure is simple and cost, besides, a ROF system is provided for realizing generating light millimeter waves and re-using up link wavelength.

Description

(1) Technical field [0001] The invention belongs to the technical field of optical fiber-wireless communication (Radio-over-Fiber, abbreviated as ROF) communication system. (2) Background technology [0002] At present, radio spectrum resources are very tight, and the frequencies suitable for wireless mobile networks have actually been divided. It is becoming more and more difficult to further develop other wireless new technologies and enhance the spectrum of existing technologies. However, our demand for information is constantly increasing, and the existing Wireless technology is difficult to meet people's requirements for bandwidth. The fourth-generation wireless access system will extend to the millimeter wave band. Optical fiber-wireless system (Radio-Over-Fiber, ROF for short) will become the most promising technology for solving broadband wireless access. The ROF system makes full use of the huge bandwidth of optical fibers to reduce costs and combines the flexibil...

Claims

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Application Information

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IPC IPC(8): H04J14/02H04B10/12H04B10/2575H04B10/50
Inventor 余建军陈林
Owner HUNAN UNIV
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