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Study On The All-Optical Clock Recovery Based On Fiber Ring Laser

Posted on:2011-06-30Degree:MasterType:Thesis
Country:ChinaCandidate:D YangFull Text:PDF
GTID:2218330338966723Subject:Communication and Information System
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The optical signal is degraded because of the dispersion and nonlinear effects during transmission. All-optical 3R(Re-amplifying, Re-shaping, Re-timing) is the very technology developed to solve this problem. The all-optical clock recovery is the key of all-optical 3R which extracts low-jitter, high SNR optical clock pulse from the deteriorated signal. With the increase on the data rate, spectral efficiency and transmission distance of single channel data rate, the Differential Phase Shift Keying (DPSK) signal has been widely used in opticl communication. And so, it's important to study on how to extact clock from NRZ-DPSK signal.The fiber ring semiconductor laser uses injected optical signal to achieve harmonic mode-locking, and it has very important functions in the optical communication, such as ultra-short pulse generator, all-optical wavelength conversion, all-optical clock recovery and so on. First, we studyed the theoretical models of the semiconductor optical amplifier (SOA), which is the key part of the fiber ring semiconductor laser. Then, the numerical models of the fiber ring semiconductor laser are also established which are based on SOA model. After that, we simulate the clock extraction from the RZ-OOK signal using MATLAB.To extract the clock component from the NRZ-DPSK signals, we add a delay interference device (DI) in the fiber ring. The NRZ-DPSK signals are changed into intensity- modulated signal after passing through the DI, and the changed signal modulated the inner optical pulse periodically. At last, we obtain the optical clock pulse.
Keywords/Search Tags:All-optical clock recovery, The fiber ring semiconductor laser, DPSK
PDF Full Text Request
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