Device for photonic generation of arbitrary microwave signals having linear frequency modulation

A microwave signal and photonic device technology, applied in nonlinear optics, laser components, lasers, etc., can solve the problems of unacceptable high signal reproducibility, not to mention phase stability, no frequency stability, etc.

Active Publication Date: 2018-08-21
CENT NAT DE LA RECHERCHE SCI +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] However, regardless of its flexibility, the technique using two lasers is unacceptable for applications where high reproducibility of the signal is necessary since there is no possible frequency stability between the two lasers, let alone phase stability, Especially unacceptable for radar applications where inter-pulse coherence is necessary

Method used

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  • Device for photonic generation of arbitrary microwave signals having linear frequency modulation
  • Device for photonic generation of arbitrary microwave signals having linear frequency modulation
  • Device for photonic generation of arbitrary microwave signals having linear frequency modulation

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Embodiment Construction

[0047] Photonic devices for generating microwave signals according to the present invention can be implemented in "fibre-based" or "integrated optics" configurations, frequency-shifting loops comprising optical fibers or waveguides; or in "free-space" configurations with discrete optical components, It is implemented in a frequency-shifting loop fabricated with precisely aligned mirrors. The expression "free space configuration" is understood to mean a configuration in which the light beam propagates completely or partly through free space.

[0048] exist figure 2 A schematic diagram of a "fibre-based" version of a photonic device for generating chirped arbitrary microwave signals according to the present invention is shown in . This version is detailed below. However, it is pointed out every time there is a clear difference between the fiber-based version and the free-space version.

[0049] figure 2 The photon-generating devices include, in order:

[0050] - laser, wh...

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Abstract

The general field of the invention is that of devices for photonic generation of arbitrary microwave signals having linear frequency modulation, including a laser (1), an assembly (2) for shaping thetransmitted signal and a photoreceptor (3), the bandwidth of which is in the microwave frequency range. The shaping assembly comprises: a first optical splitter (20); a first optical pathway comprising a frequency-shifted loop including an optical splitter (50), a first optical amplifier (60), an optical isolator (70), a first spectral optical filter (75) and an acousto-optical frequency shifter (80); a second optical pathway comprising an electro-optical frequency shifter (30); a second optical splitter (40); a second optical amplifier (90); and a second optical filter (100); the acousto-optical shifting frequency, the electro-optical shifting frequency and the amplification gain of the first optical amplifier being adjustable.

Description

technical field [0001] The field of the invention is that of photon generation of microwave signals, and more particularly of linear frequency modulated microwave signals, also known as "LFM (disclosed as MLF)" signals. Such LMF signals are also referred to as "arbitrary" signals. In the remainder of this specification, the term LFM designates the time-domain form of the signal. Such a signal is also called a "chirp". These signals are characterized by their center or average frequency (sometimes called their carrier frequency) and their passband. Passband is usually defined as the difference between the highest and lowest frequencies of a signal. In this case, the carrier frequency is comprised between 1 GHz and 100 GHz, and the passband is comprised between 0 and 200 GHz. Background technique [0002] The fields of application of microwave signals of this type are varied. For example, the areas of radar, biomedical imaging, health, spectroscopy and finally the charact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B17/00H03B23/00G02F1/11G02F1/125G02F1/225H01S3/00
CPCG02F1/11H01S3/0057H03B17/00H03B23/00H01S3/0085G02F1/125G02F2203/56G02F2/02G02F1/225G02F2201/20G02F2201/205G02F2203/13G02F2203/54
Inventor H·吉耶德沙泰吕J·阿萨尼亚
Owner CENT NAT DE LA RECHERCHE SCI
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