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A Time Lens Imaging System

A time lens and imaging system technology, applied in optics, instruments, nonlinear optics, etc., can solve problems such as affecting the accurate position of the output signal and affecting the resolution of the imaging system, so as to improve the resolution and imaging accuracy, and achieve large dispersion broadening. Effect

Active Publication Date: 2018-05-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after careful research, it is found that this is not the case. The second-order dispersion of the signal in the input fiber affects the exact position of the output signal, that is, it affects the resolution of the imaging system.

Method used

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  • A Time Lens Imaging System

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Experimental program
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Effect test

Embodiment 1

[0017] refer to Figure 1-3 , a time lens imaging system, including an input segment fiber 1, a time lens 2, and an output segment fiber 3. The time lens 2 is realized by generating FWM of signal light and pump light in a highly nonlinear fiber. When the input fiber 1 is more than ten times longer than the second-order dispersion length of the input signal light, the resolution of the imaging system can be significantly improved.

Embodiment 2

[0019] refer to Figure 1-3 , a time lens imaging system, including an input segment fiber 1, a time lens 2, and an output segment fiber 3. The time lens 2 is realized by generating FWM of signal light and pump light in a highly nonlinear silicon waveguide. When the input fiber 1 is more than ten times longer than the second-order dispersion length of the input signal light, the resolution of the imaging system can be significantly improved.

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Abstract

The invention relates to a time lens imaging system. The time lens imaging system comprises an input section dispersion fiber, a time lens and an output section dispersion fiber, wherein the two-order dispersion quantity of the input section dispersion fiber is phi''1; the dispersion of focal length of the time lens is phi''f; the two-order dispersion quantity of the output section dispersion fiber is phi''2; the length Ls of the input section dispersion fiber is greater than the threshold value Lth, Lth is equal to 10L2D, the two-order dispersion length of the input section dispersion fiber is shown in an equation in the specification, T0 is the initial pulse width of signal light, and beta2s is the two-order dispersion coefficient of the input section dispersion fiber. The time lens imaging system has the advantages that the time lens in the imaging system is realized by the four-wave mixing effect of signal light and pumping light in a high-nonlinearity medium; when Ls is greater than Lth, after the signal light obtains the enough dispersion broadening width in the input section dispersion fiber, the signal light can well generate the four-wave mixing effect with the pumping light in the time lens, so that the resolution of an outputted signal of the imaging system is improved, and the imaging accuracy is improved.

Description

(1) Technical field [0001] The present invention relates to a time lens imaging system. (2) Background technology [0002] A time lens refers to an optical device that can produce a secondary time phase shift for an optical signal. The photoelectric phase modulator can form a time lens, but the secondary phase generated is relatively small, only a few π; cross-phase modulation, and / or difference frequency can also form a time lens, but the power of the pump light must be very high. In contrast, using the four-wave mixing (FWM) effect to achieve time lensing does not require high input power and can achieve large phase modulation. In addition, in the FWM process, the wavelengths of the signal light and the generated idle light are very close, which is very useful in the field of optical communication, because the same or similar optoelectronic devices can be used for transmitting and receiving, which greatly saves the system cost. Therefore, in the aspect of signal processi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/365G02B27/00
CPCG02B27/00G02F1/365
Inventor 郭淑琴俞梦杰李伽任宏亮
Owner ZHEJIANG UNIV OF TECH