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Up-conversion photon method and system based on microwave quadruple frequency

A quadruple frequency, microwave technology, applied in the field of microwave photonics, can solve the problem of high stray signal intensity

Active Publication Date: 2020-07-03
BEIJING UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Due to the same double sideband modulation, the spurious signal strength of the system is even higher than the upconversion signal strength

Method used

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  • Up-conversion photon method and system based on microwave quadruple frequency
  • Up-conversion photon method and system based on microwave quadruple frequency
  • Up-conversion photon method and system based on microwave quadruple frequency

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the embodiments, drawings and mathematical derivation.

[0015] The structure of the up-conversion photon method and system based on microwave quadruple frequency in this embodiment is as follows figure 1 shown.

[0016] Laser 1 adopts a distributed feedback laser (RIO, ORION), and outputs an optical carrier with a center wavelength of 1550.31nm, a power of 16dBm, and a line width of 500kHz. The optical carrier enters the first dual-parallel Mach-Zehnder modulator 2 (Fujitsu, FTM7962EP). The half-wave voltage of this dual-parallel Mach-Zehnder modulator is 3.5V and the 3dB bandwidth is 22GHz. The dual parallel Mach-Zehnder modulator 2 is composed of two sub-intensity modulators (upper arm sub-intensity modulator, lower arm sub-intensity modulator) and a main intensity modulator. A DC bias voltage (DC1, DC2, DC3) control. Load the known local oscillator signal to the upper arm of the dual-parall...

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Abstract

The invention discloses a photon upconversion method and system based on microwave frequency quadruplication and belongs to the field of microwave photonics. Optical carriers generated by a laser areinput into a first double-parallel Mach-Zehnder modulator. An upper arm submodulator is modulated through utilization of local oscillator signals. Through adjustment of direct current bias of the modulator, the modulator is enabled to work a carrier suppressed maximum transmission point. Modulated optical signals enter a fiber bragg grating through an optical circulator. Through utilization of wavelength selectivity of the fiber bragg grating, positive second-order optical sidebands of a local oscillator are transmitted and are taken as carriers to enter a second double-parallel Mach-Zehnder modulator. Negative second-order optical sidebands of the local oscillator are reflected and are collected through utilization of the optical circulator. Intermediate frequency signals are loaded to the second double-parallel Mach-Zehnder modulator through utilization of a 90-dgree electric bridge, and carrier suppressed single-sideband modulation is realized through utilization of the direct current bias. Two optical paths are combined, power amplification is carried out on the optical signals, and insertion losses of the modulator are compensated. Frequency beating is carried out through utilization of a photoelectric detector, thereby obtaining frequency quadruplicated upconversion signals.

Description

technical field [0001] The invention proposes an up-conversion photon method and system based on microwave quadruple frequency, and the method and system belong to the field of microwave photonics. Background technique [0002] As an important part of the transmitter, the frequency up-converter usually implements frequency up-conversion by mixing a low-frequency intermediate frequency signal with a high-frequency local oscillator signal. There are many ways to realize microwave signal upconversion, including upconversion techniques using different modulation devices, such as cascading two intensity modulators, dual parallel Mach-Zehnder modulator (DPMZM) and dual-polarization dual-parallel Mach-Zehnder modulator etc. Upconversion method and system. However, in these methods, only the first-order sidebands of the local oscillator and the IF signal are used, and only the frequency ω LO +ω IF up-conversion signal. In this case, if higher RF signal generation is desired, a l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/50H04B10/516H04B10/556
CPCH04B10/503H04B10/5165H04B10/5563
Inventor 王云新王大勇许家豪杨登才戎路赵洁杨锋张弘骉
Owner BEIJING UNIV OF TECH
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