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Terahertz wave generating device and method based on optical four-wave mixing effect

A four-wave mixing and generating device technology, applied in the field of terahertz communication, can solve the problems of increasing the price and difficulty of the system, increasing the bandwidth requirements of modulators and microwave sources, etc.

Inactive Publication Date: 2010-08-04
HUNAN UNIV
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  • Application Information

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Problems solved by technology

However, since the generated terahertz frequency is higher than the millimeter wave frequency, the bandwidth requirements of the modulator and microwave source are increased, and the price and difficulty of the system are increased.

Method used

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  • Terahertz wave generating device and method based on optical four-wave mixing effect
  • Terahertz wave generating device and method based on optical four-wave mixing effect
  • Terahertz wave generating device and method based on optical four-wave mixing effect

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Embodiment Construction

[0033] The present invention will be specifically described below in conjunction with the accompanying drawings and embodiments.

[0034] Depend on figure 1As shown, the device for generating terahertz waves based on the optical four-wave mixing effect includes a single-mode laser 1, an electrical frequency multiplier, an intensity modulator 4, a fiber amplifier 5, a nonlinear device 6, an optical filter 7 and a photodetector 8, The input end of the electrical frequency multiplier 3 is input with a radio frequency signal output by the microwave signal source 2, and the output end of the electrical frequency multiplier 3 outputs a microwave drive signal, which together with the continuous optical signal output by the single-mode laser 1 serves as an intensity modulation The input signal of the device 4, the intensity modulator 4 outputs an optical signal containing two first-order sidebands, and then after being amplified by the optical fiber amplifier 5 in turn, it is connecte...

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Abstract

The invention discloses terahertz wave generating device and method based on optical four-wave mixing effect, which belong to the technical field of microwave photonics. The method comprises the following steps of: driving an intensity modulator by a microwave source signal through electric frequency multiplication by using optical carrier suppression modulation of the external intensity modulator and the four-wave mixing effect in a nonlinear device, forming a carrier suppression signal with only two first-order side bands, then forming two new side bands through the nonlinear device, filtering the original first-order side bands by an optical filter, only retaining two new side bands and carrying out beat frequency on the two new side bands in a PD (Photo Detector) to generate a terahertz wave frequency with six frequency multiplications. The invention lowers the requirements of the microwave modulation signal frequency and the modulator band width and reduces the cost of a system, the generating device has simple structure and favorable portability and the generated terahertz wave has very high stability.

Description

technical field [0001] The invention belongs to the field of terahertz communication in microwave photonics technology. Background technique [0002] In recent years, terahertz waves with a frequency band of 0.1-10THz have received more and more attention. It occupies a special position in the electromagnetic spectrum, coincides with millimeter waves in the long-wave direction, and coincides with infrared rays in the short-wave direction. Moreover, terahertz waves have many unique properties compared with other wave band sources, such as wide frequency band, high measurement signal-to-noise ratio, high spatial and temporal resolution imaging and signal processing suitable for information field, large capacity and high confidentiality data transmission. , real-time and safe biological and medical diagnosis and other functions. [0003] Now people are extensively studying the application of terahertz waves in practice, and the key technology is to study the generation of high...

Claims

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Application Information

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IPC IPC(8): H01S1/02H04B10/12
Inventor 文双春李瑛郑之伟范滇元
Owner HUNAN UNIV
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