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Quadruplicated frequency millimeter wave generation method based on double-parallel MZ (Mach-zehnder) modulator

A generation method, millimeter wave technology, applied in the field of ROF, can solve the problems of small dispersion effect, increased system cost, narrow spectrum, etc., to achieve the effect of improving stability and reducing overhead

Inactive Publication Date: 2013-05-01
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The optical heterodyne method is to transmit two narrow-linewidth light waves whose frequency difference is equal to the required millimeter-wave frequency, one of which carries the baseband data to be transmitted, and the millimeter-wave carrier signal is generated by heterodyning at the base station. The spectra of the two light waves are very narrow, and the dispersion effect is small, but two laser sources with good performance are required, which increases the system cost

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  • Quadruplicated frequency millimeter wave generation method based on double-parallel MZ (Mach-zehnder) modulator
  • Quadruplicated frequency millimeter wave generation method based on double-parallel MZ (Mach-zehnder) modulator
  • Quadruplicated frequency millimeter wave generation method based on double-parallel MZ (Mach-zehnder) modulator

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Embodiment Construction

[0021] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] figure 1 Schematically shows the basic structure of ROF link implementation. It is mainly divided into three parts: modulation, transmission and demodulation. Modulation is to use the modulator to modulate the radio frequency signal to the optical carrier frequency, send it out in the form of light and transmit it in the optical fiber link. The optical fiber link transmission realizes the characteristics of low loss, long distance and anti-electromagnetic interference. Then the radio frequency signal carried by the light is received by the receiver for corresponding demodulation, so as to obtain the original digital signal.

[0023] figure 2 The basic structure of a single MZ modulator is schematically shown. Each arm of the MZ modulator is equivalent to a phase modulator. The modulation process is that the two arms produce different phases u...

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Abstract

The invention relates to the field of an ROF (Radio Frequency Oscillator). The embodiment of the invention discloses a quadruplicated frequency millimeter wave generation method based on a double-parallel MZ (Mach-zehnder) modulator (DPMZM). The method comprises the main steps of: taking a laser source as a carrier, and loading the carrier on two arms of a main modulator; driving two MZ sub-modulators of an integrated modulator through the same radio frequency local oscillator, wherein a phase difference is pai; and amplifying through an EDFA (Erbium Doped Fiber Amplifier), beating frequency through PD (Potential Difference), and obtaining a quadruplicated radio source frequency millimeter wave signal.

Description

technical field [0001] The invention relates to the field of ROF, in particular to a method for generating a quadrupled frequency millimeter wave based on a dual parallel MZ modulator (DPMZM). Background technique [0002] Wireless communication has made great progress in recent years, especially after entering the 3G era. With the increase of the number of users, it will be difficult for the traditional cellular structure to meet the requirements of high speed, large capacity and high coverage, so a new structure should be improved or adopted. [0003] It can be proved by Shannon's formula that low carrier frequency provides low bandwidth, so the narrowband wireless access system provides limited capacity. There are two ways to increase the system capacity, one is to reduce the area coverage and increase the frequency band utilization, but due to the large co-channel interference in the low frequency system, this method is difficult to achieve; the other way to increase th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/2575
Inventor 喻松李泽昆张阮彬顾畹仪
Owner BEIJING UNIV OF POSTS & TELECOMM
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