A frequency multiplication millimeter wave generation and simplification device based on optics four-wave mixing effect

A technology of millimeter wave and frequency mixing, which is applied in optical fiber transmission, optical fiber radio, electromagnetic wave transmission systems, etc., can solve the problems of increasing system cost and achieve the effects of reducing cost, improving spectrum utilization, and increasing signal bandwidth

Inactive Publication Date: 2008-07-09
HUNAN UNIV
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Problems solved by technology

The two processes will use more photonic devices, increasing the system cost

Method used

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  • A frequency multiplication millimeter wave generation and simplification device based on optics four-wave mixing effect

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with specific experimental examples and accompanying drawings. As shown in FIG. 1 , each component in the frequency-doubled millimeter wave generation scheme 1 is described as follows: a single-mode laser 1 is used to generate a single longitudinal-mode optical carrier of a specified wavelength;

[0032] The Mach-Zehnder modulator 2 is used for carrier suppression modulation of a single longitudinal mode optical carrier of a specified wavelength; the erbium-doped fiber amplifier 3 is used for power amplification of the modulated signal;

[0033] High nonlinear optical fiber 5 is used to form a new mixing sideband on both sides of the two first-order sidebands of the modulated signal, wherein the frequency interval of the two new mixing sidebands is six times the local oscillator (LO) frequency ;

[0034] Tunable optical filter 4, used to filter out the two first-order sidebands of the modulation sig...

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Abstract

The invention discloses a simplified device for generating frequency-doubling millimeter wave which belongs to the field of millimeter wave generation in the radio-over-fiber (ROF) communication techniques and is based on the four-wave mixing effect in the optics. The invention uses the modulation inhibited by photo-carrier wave, the four-wave mixing (FWM) effect and the optical filter theory as well as a Mach-Zehnder modulator, and mixes a local oscillation (LO) signal and a baseband digital signal to be used for inhibited modulation of the optical signal carrier, and after the modulation signal is power amplified, the invention forms a new mixing sideband respectively at both sides of two first sidebands through a four-wave mixing (FWM) unit. The invention adopts an adjustable harmonic filter for filtering the original two first sidebands, and implements the beat frequency of the two new mixing sidebands at a photoelectric detection end, thus forming a millimeter wave signal with six octaves. The scheme can lower the frequency of the local oscillation signal source that is used and reduce the bandwidth requirements of the mixer and the optical modulator; therefore, the proposal of the invention saves system cost on the basis of increasing signal bandwidth and improving frequency spectrum utilization ratio.

Description

(1) Technical field [0001] The invention belongs to the field of millimeter wave generation in the optical fiber-wireless (Radio-over-Fiber, abbreviated as ROF) communication system technology. (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 communication 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 amplif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/12H04B10/17H04B10/2575H04B10/548
Inventor 余建军陈林
Owner HUNAN UNIV
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