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The Hybrid Protection Scheme in Hybrid OADM/OXC/MUX

Abstract
The paper describes our recent approach towards advanced in optical survivability scheme by introducing the new wavelength reconfigurable device. It is designed by improving the drawbacks appear in the previous devices with some excellence features added. The first proposal of hybrid OADM/OXC/MUX will be named as Optical Cross Add and Drop Multiplexer (OXADM). O.X.A.D.M which has presenting the concept of filtering, add-drop function, accumulation, crossconnecting, u-turn mechanism and multiplexing in a single device architecture could also increase the vast application in optical trunk network.

Analysis and Simulation on Spectral Phase-Encoded OCDMA System (subscription required)

Abstract
This paper analyzes the temporal behavior of pseudo-random code and the effects on a spectral phase-encoded time-spreading OCDMA System. A spectral phase-encoded time-spreading optical code division multiple access system designed by Optiwave's Optisystem was demonstrated. The system's performance was simulated under the different pseudo-random phase codes. The OCDMA system's performance would be better if the phase codes have equal amount of 1 and -1 and improved by increasing phase code length. The system performance is evaluated by the Bit Error Rates (BER).

Characterization of the chirp in semiconductor laser under modulation (subscription required)

Abstract
In this paper we present, shortly, a study of the chirp induced in direct modulated DFB laser. Our description of the chirp is based, first on analytical resolution of the rate equations, and second on a simulation of a heterodyne system with the Optisystem software. This study enables us to visualize the chirp of a DFB laser in the RF field and to characterize it according to the parameters of the modulation of the injection current i(t). We show by using the powerful Volterra series theory that the linear sweep of the laser optical frequency can be obtained by a triangular modulation of the injection current.

Design and simulation of a novel phase-encoded OCDMA system

Abstract
The security of optical code division multi-access (OCDMA) system was analyzed, and the results indicate the hidden trouble of security. A scheme of multi-codes to be transmitted single-user information has been proposed, and single-user eavesdropping model has been simulated. The soft platform of system simulation was built by optisystem and MATLAB. The simulation analysis of the system has been accomplished on the soft platform. The brute-force searching and a code interception have been studied. The simulation results have shown that this system has better security.

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