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Optical true time delay device and light-operated beam-forming network system

An optical true delay and network technology, applied in the field of communication, can solve problems such as no solution

Active Publication Date: 2014-02-12
BEIJING UNIV OF POSTS & TELECOMM +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For the problems referred to above, there is no solution in the prior art

Method used

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  • Optical true time delay device and light-operated beam-forming network system
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  • Optical true time delay device and light-operated beam-forming network system

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Embodiment Construction

[0022] From the introduction of the background technology, it can be seen that the OTTD module based on photonic crystal fiber proposed in the prior art has the disadvantages of long photonic crystal fiber and many light sources. As the number of channels increases, the number of light sources also increases, and the length of optical fibers increases exponentially, which is costly.

[0023] In a phased array antenna, the radiating array elements are evenly arranged, the distance between adjacent array elements is Λ, and the microwave (or light wave) frequency is f m , the microwave wavelength is λ m , θ is the radiation direction or scanning angle of the microwave signal, and c is the speed of light. Among them, the distance between adjacent array elements is usually: The relationship between the radiation direction θ and the delay difference Δτ of adjacent array elements satisfies Therefore, the key to controlling the radiation direction of the microwave signal in the O...

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Abstract

The invention discloses an OTTD device and a light-operated beam-forming network system. The OTTD device comprises an upper time delay unit and N lower time delay units, wherein the upper time delay unit comprises a first-level light beam splitter and N upper time delay lines provided with fiber gratings, each upper time delay line is arranged in the mode that one end of each upper time delay line receives a modulated light carrier from the first-level light beam splitter, each lower time delay unit is correspondingly coupled to the other end of the corresponding upper time delay line through an optical circulator, each lower time delay unit comprises a second-level light beam splitter and M lower time delay lines provided with dispersion optical fibers and / or compensated optical fibers, each lower time delay line is arranged in the mode that one end of each lower time delay line receives the light carrier from the corresponding upper time delay line through the corresponding optical circulator and the corresponding second-level light beam splitter, the M and the N are positive integers, and the time delay difference delta tauli of the light carrier between every two adjacent upper time delay lines is M times of the time delay difference delta taui of the light carrier between every two adjacent lower time delay lines.

Description

technical field [0001] The present invention relates to the communication field, in particular to an optical true delay device and method. Background technique [0002] Optically steered beamforming network (OBFN) plays an important role in microwave electronics because of its small size, low loss, and immunity to electromagnetic interference. In OBFN, the control of the beam scanning direction is realized through the design of the delay of each array element. Therefore, the delay module is the core technology of OBFN. The true time delay (TTD) module (or device) in the delay module has become a research hotspot in the field of OBFN because it can overcome the beam skew problem caused by the traditional phase shift technology under broadband microwave signals. [0003] An optical true time delay (OTTD) module based on a fiber grating is provided in the prior art, but due to the problem of grating overlap, the module cannot support high-frequency signals greater than 3 GHz. ...

Claims

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Application Information

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IPC IPC(8): H04B10/2525H04B10/2575
Inventor 高欣璐黄善国周静魏永峰张旭锴顾畹仪
Owner BEIJING UNIV OF POSTS & TELECOMM
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