In order to supply a theoretical guide for digital chaotic telecommunication, the technique of Optical injection
locking (OIL) of semiconductor lasers on the chaotic communication have been investigated based on the theoretical
models used to describe the dynamics of solitary VCSEL subjected to the external optical injection and signal
transmission in fiber. The numerical simulation results show that, the frequency chirp and time-resolved chirp are
reduced in magnitude, using a VCSEL laser as master and another VCSEL as slave, it leads to a no-penalty transmission
over 50 km of uncompensated in SSMF at 10Gb/s, and it could be higher rate and more remote if there were appropriate
compensation.

Studying the VCSEL to VCSEL injection locking for enhanced chromatic dispersion compensation

A full-light chaotic synchronization system of external light injected semiconductor lasers with optical coupled-feedback is presented.The dynamical stable characterization of laser is analyzed,its maximum Lyapunov exponent is calculated.The system synchronous error perturbed equation is proved.Synchronous error and demodulation formulae are also theoretically demonstrated under chaotic masking encoding.And the system gradual synchronization is numerically certified and successfully simulated.Synchronization transient respond and noise effect also are analyzed.The system has an anti-disturbance ability.Chaotic analog secure communication with a sinusoidal signal of 0.2 GHz modulation frequency,chaotic digital secure communication with a digital signal of 0.2 Gb/s modulation rate and chaotic shift keying secure communication with a rate of 0.05 Gb/s are numerically simulated,respectively.The decoding character and modulation bandwidth of the system are analyzed,in particular.The system shows the good ability of robust security in time-domain and frequency-domain,so it could be used in dual-directional chaotic secure communication.The system parameter mismatch is studied to illustrate that its practical performance can be realized because synchronization can be achieved under a certain range of parameter mismatch.

Theoretical Studies on Chaotic Semiconductor Laser Dual-directional Secure Communication System

To solve the weak target detection under the clutter background,combined with dynamic chaotic model,the chaotic property of the laser echo signal is discussed and a novel algorithm is presented based on chaotic signal detection using neural network predictor.The weak signal in laser clutter background can be detected by means of the prediction error.The simulated results show the algorithm is effective.

Chaotic weak signal detection in the long range laser rangefinders using neural network

单跨光纤长距离混沌激光保真传输实验研究

In order to supply a theoretical guide for chaotic telecommunication, the influences of the chromatic dispersion and
nonlinearity in fiber on the chaotic synchronization have been investigated based on the theoretical models used to
describe the dynamics of semiconductor laser subjected to the external optical feedback and signal transmission in fiber
channel. The numerical simulation results show that, the fiber nonlinear effect is responsible for the phase varying of
chaotic signal and do not affect the amplitude of the chaotic signal; due to chromatic dispersion, the amplitude
characteristics of chaotic signal are distorted significantly and the system synchronization quality will be impaired; after
propagating 200km in dispersion shifted fiber, a desirable system chaotic synchronization with a synchronized
coefficient 0.99 can be achieved by adopting a amplifier before the received laser to compensate the fiber loss.

Influences of chromatic dispersion and nonlinearity in fiber on the chaos synchronization

All-optical wavelength conversion based on four-wave mixing (FWM) is one of the key techniques for building
dynamic optical networks. In this paper, the cavity enhancing effect of the residual F-P cavity mode on the
non-degenerated four-wave mixing (NDFWM) in a distributed-feedback semiconductor laser diode (DFB-LD) have
been investigated both experimentally and theoretically. The conversion efficiency of NDFWM is obtained at small or
large frequency detuning range. The results show that the NDFWM can be enhanced obviously when the probe
wavelength matches one of the F-P cavity modes, and the high conversion efficiency can be achieved even if the
frequency detuning between the injection probe frequency and free-running frequency of the DFB-LD is up to THz.

The cavity enhancing effect of F-P cavity mode on the non-degenerated four-wave mixing in distributed-feedback semiconductor laser diodes

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Influences of chromatic dispersion and nonlinearity in fiber on the chaos synchronization

The cavity enhancing effect of F-P cavity mode on the non-degenerated four-wave mixing in distributed-feedback semiconductor laser diodes