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
3 Cites 11 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, the device requires a lot of optical devices, the insertion loss is large, and multiple nodes ...
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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.

Application Domain

Non-linear optics

Technology Topic

PhysicsLight wave +12

Image

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

Examples

  • Experimental program(1)

Example Embodiment

[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 end of the first electrical amplifier is connected to the upper arm sub-modulator The radio frequency drive port is connected; the output port of the electric phase shifter is connected with the input end of the second electric amplifier, and the output end of the second electric amplifier is connected with the radio frequency drive port of the lower arm sub-modulator.
[0023] In this example, the specific implementation steps of the method are:
[0024] Step 1. The adjustable light source generates a continuous light wave with a wavelength of 1552.5nm. The continuous light wave is input to the nested Mach-Zehnder modulator with a half-wave voltage of 4V. The RF signal source outputs a 10GHz sine wave signal, and the sine wave signal is sent by an electrical splitter. Divided into two circuits: the first sine wave signal is amplified by the first electric amplifier to drive the upper arm sub-modulator, the second sine wave signal is phase-shifted by the electric phase shifter, and then amplified by the second electric amplifier to drive the lower arm sub-modulator Modulator;
[0025] Step 2, respectively controlling the amplified voltages of the first electrical amplifier and the second electrical amplifier, so that the peak-to-peak values ​​of the first sinusoidal signal and the second sinusoidal signal are both amplified to 13V, while adjusting the embedding The bias voltage of the upper arm sub-modulator and the lower arm sub-modulator of the Mach-Zehnder modulator is 0V, then the output of the upper arm sub-modulator and the lower arm sub-modulator includes the center carrier, the fourth-order upper/lower sideband , an optical signal with 7 frequency components of the sixth-order upper/lower sideband and the eighth-order upper/lower sideband;
[0026] Step 3, adjusting the phase shift amount of the electric phase shifter to be π/2, and setting the main bias voltage of the nested Mach-Zehnder modulator to 4V, then the nested Mach-Zehnder modulator finally outputs An optical signal composed of a sixth-order upper sideband and a sixth-order lower sideband with a frequency interval of 0.12TGHz;
[0027] Step 4: The optical signal output by the nested Mach-Zehnder modulator is photoelectrically converted by the photodetector, and the sixth-order upper sideband and sixth-order lower sideband beat each other to generate a terahertz wave with a frequency of 0.12 THz.
[0028] image 3 For this example apply to figure 2 The results shown. in, image 3 (a) is the time-domain waveform of a 10GHz sine wave signal, and it can be seen that its period is 100ps; image 3 (b) is the spectrum of the output optical signal of the upper arm sub-modulator of the nested Mach-Zehnder modulator. It can be seen that it contains 7 frequency components, which are the center carrier, the fourth-order upper/lower sideband, and the sixth-order upper/lower sideband and the eighth-order upper/lower sideband, where the frequency intervals between the center carrier and the fourth-order upper sideband and sixth-order upper sideband are 0.04THz and 0.06THz, respectively; image 3(c) is the time-domain waveform of the generated terahertz wave. It can be seen that its period is ~8.33ps, which is basically consistent with the waveform of the original 10GHz sine wave signal; image 3 (d) is the spectrum of the output optical signal of the nested Mach-Zehnder modulator, it can be seen that it is composed of the sixth-order upper sideband and the sixth-order lower sideband, and the frequency interval is 0.12THz; image 3 (e) is the spectrum of the generated terahertz wave. It can be seen that the power of the 0.12THz frequency point is about 37dB higher than that of other frequency points.
[0029] In a word, the above-mentioned embodiments are only preferred examples of the present invention, and are not only used to limit the protection scope of the present invention. It should be pointed out that for the ordinary technology in this technical field, several equivalent deformations and substitutions can be made on the content disclosed in the present invention, and the frequency range of the terahertz wave is not limited to 0.12THz. These equivalent deformations and substitutions and frequency Range modulation should also be regarded as the protection scope of the present invention.
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