Method and apparatus for generating multi-frequency microwave signal source

A high-frequency microwave and signal method technology, applied in electromagnetic wave transmission systems, electrical components, transmission systems, etc., can solve problems such as difficulty in increasing the frequency of microwave signals

Inactive Publication Date: 2009-07-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the limitations of electronic bottlenecks, it is difficult to

Method used

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  • Method and apparatus for generating multi-frequency microwave signal source
  • Method and apparatus for generating multi-frequency microwave signal source

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Embodiment 1

[0027] The effect of four-wave mixing in highly nonlinear fibers can be achieved by image 3 To illustrate. image 3 (a) is the spectrum diagram of the optical carrier generated by the laser before entering the intensity modulator. When a microwave driving signal with a frequency of 8GHz is applied to the intensity modulator, multiple optical sidebands will be generated on both sides of the optical carrier, such as image 3 (b) shown. However, the number of optical sidebands generated by direct modulation is limited, and the intensity difference between each sideband is relatively large, which will affect the frequency number and intensity balance of the microwave signal generated by the beat frequency. The modulated optical carrier is incident into the highly nonlinear fiber for four-wave mixing, through this effect, the energy exchange between each optical sideband is fully performed, thereby increasing the number of output light waves and reducing the distance between eac...

Embodiment 2

[0029] use figure 2 The first-order Brillouin frequency shift module shown in (a) uses the laser output with a wavelength of 1555.4nm as the incident light. The combined spectrum of first-order Stokes light as Figure 4 As shown in (a), the frequency difference between the two peaks is 11.8GHz. When they are incident on the photodetector to generate optical beat frequency, the obtained multi-frequency microwave signal spectrum is as follows Figure 5 As shown, its center frequency is 11.8GHz. Figure 5 The frequency of the driving signal used in (a) is 1 GHz, Figure 5 The frequency of the driving signal used in (b) is 500MHz, and the frequency interval of the multi-frequency microwave signal is the same as that of the driving microwave signal, which are 1GHz and 500MHz, respectively.

Embodiment 3

[0031] use figure 2 The secondary Brillouin frequency shift module shown in (b) uses the laser with a wavelength of 1555.4nm output by the laser as the incident light. The combined spectrum of first-order Stokes light as Figure 4 As shown in (b), the frequency difference between the two peaks is 21.6GHz. When they are incident on the photodetector to generate optical beat frequency, the obtained multi-frequency microwave signal spectrum is as follows: Image 6 As shown, its center frequency is 21.6GHz. Image 6 The frequency of the driving signal used in (a) is 1 GHz, Image 6 The frequency of the driving signal used in (b) is 500 MHz, and the frequency interval of the multi-frequency microwave signal is the same as that of the driving microwave signal, which are 1 GHz and 500 MHz, respectively.

[0032]In the present invention, lasers, optical amplifiers, couplers / splitters, low-frequency microwave signal sources, intensity modulators, highly nonlinear optical fibers, p...

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Abstract

The present invention discloses a method for generating multiple and high frequency microwave signal source and a device thereof. The optical wave generated by laser is divided into two paths by the first optical amplifier through a first coupler/beam splitter. One path of optical wave emits into a Brillouin frequency shift module as a pump light for generating Stokes light with frequency shift. The other path of optical wave passes through an intensity modulator, a second optical amplifier and a high non-linear optical optical fiber. After the two paths of light are accessed into a second coupler/beam splitter, optical beat is generated on a photoelectric detector. The multiple and high frequency microwave signal is generated. The adoption of total optical plan can overcome the limit of electrionic bottleneck and is easy for realizing the generation of high frequency microwave signal. The multiple and high frequency microwave can be conveniently realized through stimulated Brillouin scattering in the optical fiber, the strength modulation of optical carrier and the equalization and stabilization effects of four-wave mixing of optical fiber, wherein the central frequency is determined by Brillouin frequency shift amount. The frequency interval can be freely adjusted through driving the microwave frequency. The requirement of applications of multiplexing wireless communication by subcarrier, etc. is satisfied.

Description

technical field [0001] The invention relates to the fields of optoelectronics and microwave photonics, in particular to a method and device for generating multi-frequency high-frequency microwave signal sources. Background technique [0002] In recent years, with the rapid growth of information in the form of data, voice, video and multimedia, it is very urgent to increase the bandwidth of communication systems. In a wireless communication system, in order to obtain a higher data transmission rate, an effective method is to increase the operating frequency of the wireless carrier. At present, the operating frequency of most wireless communication services is concentrated below 5GHz. If high-frequency microwave signals are used as the carrier, the system capacity will be greatly improved. On the other hand, with the continuous development and maturity of Radio-over-Fiber (RoF) technology, wavelength division multiplexing and subcarrier multiplexing have also become important...

Claims

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Application Information

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IPC IPC(8): H04B10/155H04B10/18
Inventor 高士明高莹
Owner ZHEJIANG UNIV
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