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A Method for Analyzing Chaotic Dynamics of Electro-optic Phase Similar to Frequency Dependent Time Delay

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

Inactive Publication Date: 2020-12-08
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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  • A Method for Analyzing Chaotic Dynamics of Electro-optic Phase Similar to Frequency Dependent Time Delay
  • A Method for Analyzing Chaotic Dynamics of Electro-optic Phase Similar to Frequency Dependent Time Delay
  • A Method for Analyzing Chaotic Dynamics of Electro-optic Phase Similar to Frequency Dependent Time Delay

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Embodiment Construction

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

[0069] According to this embodiment figure 1 The analysis flow is similar to the analysis method of frequency-dependent time-delay electro-optic phase chaotic dynamics. The analysis method is as follows:

[0070] The first step: establish the dynamic mathematical model in the chaotic communication system.

[0071] The present invention models the transmitting end part in the chaotic communication system, and the system uses a 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 respectively, G is the gain of the electric amplifier, and φ is the initial phase.

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

[007...

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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 technical field of optical information, and in particular relates to an analysis method of electro-optic phase chaos dynamics similar to frequency-dependent time delay. Background technique [0002] In current chaotic optical communication systems, semiconductor lasers are often coupled to each other to increase their degrees of freedom to generate chaotic signals. Its biggest feature is to use the chaotic signal as the carrier of the signal. Since the chaos has the characteristics of synchronization and robustness, it can realize the decoding of the transmitted information. When transmitting a signal, the chaotic carrier output from 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 transmitted informati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/00H04L9/32G06F17/13G06F17/14G06F30/20
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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