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Device and method for generating terahertz wave based on nested Mach-Zehnder modulator

A modulator and nested technology, applied in the field of terahertz wireless communication, can solve the problems of many optical devices, complex implementation, large insertion loss, etc., to simplify the device structure, reduce bandwidth requirements, strong operability and tunability. Effect

Inactive Publication Date: 2013-01-02
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the device requires a lot of optical devices, the insertion loss is large, and multiple nodes of the device need to control the polarization of the light wave, which is very complicated to implement

Method used

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  • Device and method for generating terahertz wave based on nested Mach-Zehnder modulator
  • Device and method for generating terahertz wave based on nested Mach-Zehnder modulator

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Embodiment Construction

[0021] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] like figure 2 As shown, in this embodiment, the device includes: an adjustable light source, a radio frequency signal source, an electrical shunt, a first electrical amplifier, an electrical phase shifter, a second electrical amplifier, a nested Mach-Zehnder modulator and a photodetector; the output end of the adjustable light source is connected to the optical input port of the nested Mach-Zehnder modulator, and the optical output end of the nested Mach-Zehnder modulator is connected to the optical input port of the photodetector; the radio frequency signal The output port of the source is connected to the input end of the electrical splitter, and the two output ports of the electrical splitter are respectively connected to the input end of the first electrical amplifier and the input end of the electrical phase shifter; the output en...

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Abstract

The invention discloses a device and a method for generating a terahertz wave based on a nested Mach-Zehnder modulator in the field of terahertz wireless communication. The device comprises a tunable light source, a radio frequency signal source, an electric branching unit, a first electric amplifier, an electric phase shifter, a second electric amplifier, the nested Mach-Zehnder modulator and a photoelectric detector. The method comprises the following steps that: a low-frequency sine wave signal output by the radio frequency signal source is divided into two paths by the electric branching unit; the two paths of signals are amplified by a first amplifier and a second amplifier and then respectively drive an upper arm sub-modulator and a lower arm sub-modulator of the nested Mach-Zehnder modulator; continuous light waves output by the tunable light source are input into the nested Mach-Zehnder modulator to modulate; the tuned continuous light waves are input into the photoelectric detector to carry out photoelectric conversion, and the output end of the photoelectric detector generates the terahertz wave which is 12fold as much as the frequency of the low-frequency sine wave signal by rationally adjusting modulation voltage and offset voltage of the nested Mach-Zehnder modulator. The device is simple in configuration, and the system cost and the requirements on the apparatus bandwidth are reduced.

Description

technical field [0001] The invention belongs to the field of terahertz wireless communication, and in particular relates to a device and method for generating terahertz waves. Background technique [0002] Terahertz waves are electromagnetic waves with an electromagnetic frequency between 0.1 and 10 THz (wavelength between 3mm and 30mm), and the wave band is between microwave and far-infrared light. Terahertz technology can be widely used in radar, remote sensing, atmospheric and environmental monitoring, real-time biological information extraction, and medical diagnosis. In terms of communication transmission, due to the characteristics of transient, broadband, low energy and high penetration of terahertz waves, terahertz waves show more superior transmission capabilities than traditional microwaves and light waves. At present, the terahertz frequency band belongs to the blank frequency band, so the study of terahertz wireless communication can seize wireless spectrum reso...

Claims

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Application Information

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IPC IPC(8): G02F1/35G02F1/39
Inventor 文鸿李长云马革新翁艳彬周恒
Owner HUNAN UNIV OF TECH
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