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Analysis method of similar frequency-dependent delay electro-optic phase chaotic dynamics

A technology related to time delay and analysis method, applied in the field of optical information

Inactive Publication Date: 2018-11-06
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the amplitude of the signal is much smaller than the fluctuation of the chaotic carrier, it is difficult to separate the signal from the chaotic carrier

Method used

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  • Analysis method of similar frequency-dependent delay electro-optic phase chaotic dynamics
  • Analysis method of similar frequency-dependent delay electro-optic phase chaotic dynamics
  • Analysis method of similar frequency-dependent delay electro-optic phase chaotic dynamics

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Embodiment Construction

[0068] The embodiments of the present invention will be described in detail below in conjunction with the drawings.

[0069] This example follows figure 1 The analysis process is similar to the analysis method of frequency-dependent delay electro-optic phase chaotic dynamics. The analysis method is as follows:

[0070] Step 1: Establish a dynamic mathematical model in the chaotic communication system.

[0071] The invention models the transmitting end part of the chaotic communication system. The system adopts the Mach-Zehnder interferometer for phase modulation, and the transmitting end equation can be written as

[0072]

[0073]

[0074] Among them, τ and θ are the response time corresponding to the high cut-off frequency and low cut-off frequency of the feedback loop, G is the gain of the electric amplifier, and φ is the initial phase.

[0075] Step 2: Determine the relationship between delay and frequency.

[0076] In this communication system, the frequency-related delay is gener...

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Abstract

The invention discloses an analysis method of similar frequency-dependent delay electro-optic phase chaotic dynamics. The method is executed according to the following steps: step 1, building a dynamic mathematical model in a chaotic communication system; step 2, determining a relation between delay and frequency; step 3, dividing time interval and determining an equation initial value; step 4, solving a delay signal of each moment in one period of time after delay through Fourier time-frequency transformation; step 5, converting a delay differential equation into an ordinary differential equation; step 6, performing numerical solution for the ordinary differential equation of the step 5 through a Runge-Kutta method. The method provided by the invention can accurately solve a differential-integral equation having frequency-dependent delay, and can accurately analyze chaotic dynamics and chaotic communication having frequency-dependent delay feedback.

Description

Technical field [0001] The invention belongs to the field of optical information technology, and specifically relates to an analysis method of similar frequency-dependent time delay electro-optical phase chaotic dynamics. Background technique [0002] In current chaotic optical communication systems, semiconductor lasers are often coupled with each other to increase their degrees of freedom to generate chaotic signals. Its biggest feature is the use of chaotic signals as the signal carrier. Because chaos has the characteristics of synchronization and robustness, it can realize the decoding of transmitted information. When transmitting a signal, the chaotic carrier output by the transmitter acts as a carrier for transmitting the signal. Since the amplitude of the signal is much smaller than the fluctuation of the chaotic carrier, it is difficult to separate the signal from the chaotic carrier. Specifically, in order to decode the signal, the transmission information needs to be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/00H04L9/32G06F17/13G06F17/14G06F17/50
CPCG06F17/13G06F17/14G06F30/20H04L9/001H04L9/3247
Inventor 李齐良陈德望包琪胡淼周雪芳曾然杨淑娜唐向宏杨国伟毕美华卢旸
Owner HANGZHOU DIANZI UNIV
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