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Microwave photon down-conversion method based on bi-directional utilization of phase modulator

A phase modulator, microwave photonic technology, applied in electromagnetic wave transmission systems, electrical components, transmission systems, etc., can solve problems such as system stability cannot be guaranteed

Inactive Publication Date: 2014-06-25
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Very susceptible to DC drift of the opto-electronic modulator
Therefore, the stability of the system cannot be guaranteed

Method used

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  • Microwave photon down-conversion method based on bi-directional utilization of phase modulator
  • Microwave photon down-conversion method based on bi-directional utilization of phase modulator
  • Microwave photon down-conversion method based on bi-directional utilization of phase modulator

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Embodiment Construction

[0013] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0014] figure 1 The overall system structure diagram of microwave photon frequency down-conversion based on the bidirectional phase modulator is described in , where S101 is the input laser, after passing through the photoelectric optical isolator S102, the optical path passes through a 1:99 polarization-maintaining coupler S103 to inject light waves into the phase modulation in device S104. Load the radio frequency signal S103 to the first electrical port of S104 to modulate the optical signal. After the modulated light wave passes through S105: Fiber Bragg Grating, the optical sideband with radio frequency frequency is transmitted, and the optical carrier is reflected back and injected back into S104. At this time, the local oscillator microwave signal S108 plays a role in modulating the optical carrier. Since the luminous ratio of S103 is 1:99, mos...

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Abstract

The invention provides a microwave photon down-conversion method based on bi-directional utilization of a phase modulator. The method includes the following steps that a radio frequency microwave signal and a local oscillator microwave signal are loaded to two ports of the phase modulator, meanwhile, two Bragg fiber gratings are placed on two optical ports of the modulator respectively to form an optical wave oscillator, and optical carrier waves are injected to the optical wave oscillator through a 1:99 optical coupler. The frequency of two optical sidebands transmitted by the Bragg fiber gratings are respectively radio frequency and local oscillator frequency, frequency conversion signals are detected by the sidebands with the two frequency components through a 50:50 coupler and a balance detector, and therefore a microwave photon down-conversion system with conversion efficiency improved is formed.

Description

technical field [0001] The present invention relates to a method for realizing the frequency variation of microwave photons, and more particularly, to the utilization of fiber gratings and optoelectronic phase modulators. Background technique [0002] Microwave communication can be transmitted in any direction, easy to build and reconstruct, and realize the interconnection with mobile devices; the emergence of cellular systems makes microwave communication have high spectrum utilization. However, the limited bandwidth of the microwave frequency band has become a serious problem at present, and people have begun to consider realizing wireless communication in a higher microwave frequency band or even millimeter waves. However, the loss of the millimeter wave band in the atmosphere is very large. For example, the transmission loss of the 60GHz signal in the atmosphere is as high as 14dB / km, which means that the channel frequency can be reused more frequently in cellular mobile...

Claims

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Application Information

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IPC IPC(8): H04B10/548
Inventor 蒋天炜喻松谢倩李健李丹叶辛萌顾畹仪
Owner BEIJING UNIV OF POSTS & TELECOMM