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Multiple frequency millimeter wave generating device based on single-drive Mach-Zehnder modulator

A modulator and single-drive technology, applied in modulation carrier systems, optical fiber transmission, digital transmission systems, etc., can solve the problems of large insertion loss, increase system cost, and difficult to adjust, and achieve easy control, simple structure, and high flexibility. Effect

Inactive Publication Date: 2013-09-04
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the existing technical solutions, there is a solution based on four-wave mixing, but this solution requires a large input power and another excitation light source, which increases the cost. There are also solutions based on complex modulators or cascaded modulators. solution, which has problems such as large insertion loss and difficult adjustment
[0003] After searching the existing literature, it was found that "Optical millimeter-wave signal generation using frequency quadrupling technique and no optical filtering" recorded in Volume 20 of "IEEE Photonic Technology Letters (IEEE Photonic Technology Letters)" in 2008 In the scheme of photonic millimeter wave generation), this technology uses an integrated dual-parallel Mach-Zehnder modulator (DPMZM) to directly generate a quadrupled frequency millimeter wave, but this method requires complex electrical signal processing, resulting in high Electrical insertion loss, in addition, high-performance high-frequency electrical devices need to be used, which increases the cost of the system; not only that, but the solution needs to adjust three bias voltages, which increases the complexity of the system
[0004] After searching, it was found that in the paper "Generation of 60-GHz Optical Millimeter-Wave and 20-GHz Channel-Spaced Optical Multicarrier Using Two Cascaded 10-GHz Modulators" (based on cascaded 10-GHz modulators) in the 2008 Asian Optical Communication Conference (ACP2008) Generation of 60-GHz optical millimeter wave and multi-carrier scheme with 20-GHz spacing)", a scheme based on cascaded single-driver Mach-Zehnder (SDMZM) is proposed, which can generate six times frequency millimeter wave, but the scheme requires Cascaded modulators increase the optical domain insertion loss and system cost; in addition, this solution also requires strict control of the phase of the two modulators, which increases the complexity of the system

Method used

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  • Multiple frequency millimeter wave generating device based on single-drive Mach-Zehnder modulator
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  • Multiple frequency millimeter wave generating device based on single-drive Mach-Zehnder modulator

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] like figure 1 As shown, it includes: laser CW, polarization controller PC for adjusting the polarization state of continuous laser, single-drive Mach-Zehnder modulator SDMZM, radio frequency signal source RFS, radio frequency signal amplifier PA, regulated power supply PS and photodetector PD , where: the continuous laser output from the laser CW is adjusted by the polarization controller PC and sent to the single-drive Mach-Zehnder modulator SDMZM, and the radio-frequency signal output by the radio-frequency signal source RFS is amplified by the radio-frequency signal amplifier PA and sent to the single-drive Mach-Zehnder modulator SDMZM, the stabilized power supply PS is used to adjust the bias voltage of the single-drive Mach-Zehnder modulator SDMZM, the output end of the single-drive Mach-Zehnder modulator SDMZM is connected to the photodetector PD so that the output optical signal is converted into an electrical signal, Thus, millimeter waves are obtained.

[0026...

Embodiment 2

[0031] The device of this embodiment is the same as that of Embodiment 1.

[0032] image 3 It is a schematic diagram and simulation results of generating a frequency six times the frequency, and the specific implementation process is as follows:

[0033] In this embodiment, the working wavelength of the laser CW is 1550nm, and the output frequency of the radio frequency signal source RFS is 10GHz; the Mach-Zehnder modulator SDMZM works at the lowest point of the modulation curve by adjusting the voltage stabilized power supply PS, so that the even harmonic are suppressed, only the odd harmonic components. like image 3 As shown in a), by adjusting the output voltage of the RF amplifier, it can be obtained that the Mach-Zehnder modulator SDMZM works at point A. At this time, compared with the third-order component, the first-order component, fifth-order component and high-order component are very small , so that the six-fold frequency signal in the optical domain can be obt...

Embodiment 3

[0035] The device of this embodiment is the same as that of Embodiment 1.

[0036] Figure 4 It is a schematic diagram and simulation results of frequency octave generation, and the specific implementation process is as follows:

[0037] In this embodiment, the working wavelength of the laser CW is 1550nm, and the output frequency of the radio frequency signal source RFS is 10GHz; the Mach-Zehnder modulator SDMZM works at the highest point of the modulation curve by adjusting the voltage stabilized power supply PS, so that the odd harmonic are suppressed, only the even harmonic components. like Figure 4 As shown in a), by adjusting the output voltage of the RF amplifier, it can be obtained that the Mach-Zehnder modulator SDMZM works at point A. At this time, relative to the fourth-order component, the fundamental frequency component, second-order component, fourth-order component and high-order The components are very small, so that the octave frequency signal in the optic...

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Abstract

The invention belongs to the technical field of optical fiber communication, and relates to a multiple frequency millimeter wave generating device based on a single-drive Mach-Zehnder modulator. The multiple frequency millimeter wave generating device comprises a laser device, a polarization controller, the single-drive Mach-Zehnder modulator, a radio frequency signal source, a radio frequency signal amplifier, a voltage stabilization power source and a photoelectric detector, wherein the polarization controller is used for adjusting the polarization state of a continuous laser. The continuous laser output by the laser device is adjusted through the polarization controller and then is transmitted to the single-drive Mach-Zehnder modulator, and a radio frequency signal output by the radio frequency signal source is amplified through the radio frequency signal amplifier and then is transmitted to the single-drive Mach-Zehnder modulator. The voltage stabilization power source is used for adjusting the bias voltage of the single-drive Mach-Zehnder modulator. An output end of the single-drive Mach-Zehnder modulator is connected with the photoelectric detector, so that an output optical signal is converted to an electric signal, and then a millimeter wave is obtained. The multiple frequency millimeter wave generating device is simple in structure, low in cost, easy to control, high in flexibility and strong in practicality.

Description

technical field [0001] The present invention relates to a device in the technical field of optical fiber communication, in particular to a multi-frequency millimeter wave generating device based on a single-drive Mach-Zehnder modulator. Background technique [0002] As we all know, the available bandwidth of electromagnetic waves is about one tenth of its frequency, so the millimeter wave band has a large communication bandwidth, which in turn can transmit wireless signals at a large rate. In recent years, research on millimeter waves has attracted more and more attention. Millimeter waves can be generated in the electrical domain, but the cost is relatively high, and the electrical bandwidth itself is also limited. Therefore, the academic community proposes to use photon multiplication to generate millimeter waves. The specific principle is as follows: modulate the low-speed radio frequency signal onto the optical carrier, and obtain an optical millimeter wave with a frequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/2575H04L27/00
Inventor 张亮胡小锋曹攀庄志明苏翼凯
Owner SHANGHAI JIAO TONG UNIV