Time domain stealth method and device based on light-induced amplifier

Abstract

The invention provides a time domain stealth method and device based on a light-induced amplifier, which only needs to detect whether an event occurs in a detection time range, and does not carry out detection in a time range which does not need detection. The device comprises an event signal light generator, a scanning signal light generator, an optical coupler, a light-sensitive amplifier and an adjustable filter, the event signal light generator and the scanning signal light generator generate event signal light and scanning signal light respectively, and the event signal light and the scanning signal light are coupled by the optical coupler and then input into the light-sensitive amplifier. When the event signal light and the scanning signal light are transmitted in the light-sensing amplifier, new-frequency light can be generated, the generated new-frequency light is filtered out through the adjustable filter, and compared with a reported time domain hiding method, the method is easy to achieve, the size of a hiding time window can be flexibly adjusted, the size is small, and integration is easy. And more than one path of time domain stealth signal light can be realized, the stealth efficiency is high, the problem of ripples in a time domain stealth window is avoided, and the stealth effect is better.

Description

technical field [0001] The invention relates to the technical field of time-domain stealth, in particular to a time-domain stealth method and device based on an optical induction amplifier. Background technique [0002] Stealth, a technology that was considered impossible to exist in the real world in the past, is gradually becoming a reality with the development of science and technology. The earliest research on stealth is the stealth of space objects. By changing the refractive index around space objects, the effect of space objects to observers is realized, that is, airspace stealth. The opposite of airspace cloaking is time-domain cloaking. Time-domain cloaking is to hide events that occur at a certain moment in the time domain from observers. In the future, secure communication and cipher encryption have huge potential application value, and are currently the hotspots of people's research. [0003] At present, some researchers have proposed a scheme to realize time-d...

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Problems solved by technology

[0003] At present, some researchers have proposed a scheme to realize time-domain stealth by using optical fiber dispersion. By allowing the linear chirp detection optical signal to transmit in the optical fiber, the dispersion of the optical fiber causes the linear chirp detection light to generate a time gap without optical power. Any event that occurs will not be detected, and then the time gap will be closed through a section of dispersion compensating optical fiber. The generation of linear chirp detection optical signal required by this scheme is relatively complicated, and there will be obvious ripples after the stealth window is closed. The optical device used More, more complicated to implement

In addition, some researchers realized the Talbot effect in the time domain based on the dispersion of the optical fiber, and further used the Talbot effect in the time domain to realize the time-domain stealth of periodic signals and non-periodic signals, but this scheme needs to comprehensively design the signal pulse repetition period and the second-order dispersion of the optical fiber The coefficient and the fiber length of the light make these three parameters just meet the conditions for generating the Talbot effect in the time domain, and the implementation process lacks flexibility

Moreover, the time-domain stealth based on the optical fiber dispersion effect requires a long optical fiber, which makes the time-domain stealth solution based on the optical fiber dispersion effect very large and cannot be integrated.

[0004] There are other researches that use time-domain segmentation and time-domain backfilling to realize time-domain stealth. Compared with the method of using dispersion to realize time-domain stealth, this method is much smaller, but due to the need to "open" and "close" the stealth window Two steps, the implementation process is cumbersome and requires more optical devices

[0005] In addition, in the stealth schemes reported so far, only one time-domain stealth signal light can be realized, and the stealth efficiency is relatively low

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