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Modulator-free optical millimeter wave generating method and full-duplex optical fiber wireless communication system

A technology of optical millimeter wave and generation method, which is applied in optical fiber radio, electromagnetic wave transmission system, optical fiber transmission, etc., can solve the problems of increasing the cost of the central station, and achieve the effect of simple structure, saving photonic devices, and easy realization

Inactive Publication Date: 2007-09-26
HUNAN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, these methods are bound to increase the cost of the central station, so how to use the simplest and cheapest method to generate optical millimeter waves is a key technology that must be solved in the current ROF system

Method used

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  • Modulator-free optical millimeter wave generating method and full-duplex optical fiber wireless communication system
  • Modulator-free optical millimeter wave generating method and full-duplex optical fiber wireless communication system
  • Modulator-free optical millimeter wave generating method and full-duplex optical fiber wireless communication system

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Embodiment Construction

[0081] The present invention will be described in detail below in conjunction with specific experimental examples and accompanying drawings.

[0082] As shown in Figure 1, each component of the central station is described as follows:

[0083] The baseband data signal 1 refers to a downlink data signal;

[0084] A radio frequency sine wave signal source 2 generates a radio frequency sine wave signal;

[0085] Mixer 3, for mixing the data signal and the radio frequency sine wave signal;

[0086] The direct modulation laser 4 is used to generate a single longitudinal mode optical carrier of a specified wavelength and modulate the output signal of the frequency mixing onto the optical carrier, which can be DFB-LD; in this embodiment, the radio frequency signal is 1-40GHZ, and can also be higher frequency;

[0087] The photodetector 99 in the central station is mainly used for photoelectric conversion of the optical signal sent from the uplink.

[0088] Fig. 2 is the first imp...

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Abstract

The invention discloses a method of generating light millimeter wave without light modulator and full duplex fiber wireless communication system which belongs to fields of Radio-on-Fiber (ROF) communication system. The base band data signal and radio frequency sine wave are mixed to drive the direct modulating laser to generate double-side-band signal, then transmitted to the base station via optical fiber, the base station adopts filter to separate first order side-band signal and center carrier wave. The first order side-band forms light millimeter wave whose repetition frequency is two times of radio frequency signal. The full duplex fiber wireless communication system of the invention provides five realization schemes of up-bound link and two schemes of receiver. Said method of generating light millimeter wave and full duplex fiber wireless communication system decrease the amount of light elements used, and economic effect can be obtained.

Description

(1) Technical field [0001] The invention belongs to the technical field of optical fiber-wireless (Radio-over-Fiber, abbreviated as ROF) communication system. (2) Background technology [0002] The future wireless access system will undoubtedly extend to the millimeter wave band. Due to the short transmission distance of the millimeter wave signal in the air and the relatively expensive millimeter wave electronic components, the current wireless access method cannot meet the requirements of the millimeter wave communication. Optical fiber-wireless system (Radio-Over-Fiber System, referred to as ROF system) will become the most promising technology for solving broadband wireless access. The ROF system uploads the millimeter wave and data signals to the optical carrier at the same time in the central station, and transmits them to the base station. In the base station, it only needs to perform photoelectric conversion and amplification, so the structure of the base station can...

Claims

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Application Information

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IPC IPC(8): H04B10/155H04B10/12H04B10/16H04B10/2575
Inventor 余建军陈林
Owner HUNAN UNIV
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