The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Based on information-theoretic security, physical-layer security in an optical code division multiple access (OCDMA) system is analyzed. For the first time, the security leakage factor is employed to evaluate the physicallayer security level, and the safe receiving distance is used to measure the security transmission range. By establishing the wiretap channel model of a coherent OCDMA system, the...
A novel type of all-optical D, S-R, J-K and T flip-flop based on polarization Sagnac loop is investigated in this paper, which adopts highly nonlinear of hollow-core photonic crystal fiber (HC-PCF). The novel all-optical flip-flops (AOFFs) can decrease the length of circuit, the input power, and the transmission loss. The principles and characteristics of Sagnac loop are analyzed and the design of...
We put forward the first all-optical optical code-division multiple-access(OCDMA) system with 2 users based on variable code shift keying(CSK). The all-optical exclusive OR logical gate in the system employs the ultrafast performance of optical fiber nonlinear effect and operates without wavelength transforming. In our system, the data rate is 10Gb/s and the transmission distance in optical fiber...
A new family of two-dimensional optical orthogonal code with zero cross-correlation zone (2-D ZCZ) is constructed, using primary LA sequence for time spreading and OCS (one-coincidence sequence) for wavelength hopping. Performances of autocorrelation and cross-correlation of 2-D ZCZ are analyzed. BER performance of two-dimensional OCDMA system is also analyzed.
The effects of pulse shape and pulse width on chip-asynchronous coherent time-spreading OCDMA system are evaluated by the aperiodic cross-correlation function of up-sampled sequence. For 127 length Gold sequence, normalized throughtput of OCDMA is derived. It can be shown that the shorter optical pulse will obtain larger normalized throughtput.
Based on 40Gbit/s Return-to-zero differential phase-shift keying (RZ-DPSK) DWDM system, the four dispersion management programs are proposed to suppress optical pulse phase jitter induced by kerr nonlinear effect including the self-phase modulation (SPM) and cross- phase modulation (XPM). The tolerance against the kerr nonlinear effect is studied through detailed numerical simulation by Split-Step...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.