Future network will include wavelength division multiplexing (WDM) and optical time division multiplexing (OTDM) technologies. All-optical format conversion between their respective preferable data formats, non-return-to-zero (NRZ) and return-to-zero (RZ), may become an important technology. In this paper, 10Gbit/s all-optical NRZ-to-RZ conversion is demonstrated based on terahertz optical asymmetric demultiplexer (TOAD) using clock all-optically recovered from the NRZ signal for the first time. The clock component is enhanced in an SOA and the pseudo-return-to-zero (PRZ) signal is filtered. The PRZ signal is input into an injection mode-locked fiber ring laser for clock recovery. The recovered clock and the NRZ signal are input into TOAD as pump signal and probe signal, respectively, and format conversion is performed. The quality of the converted RZ signal is determined by that of the recovered clock and the NRZ signal, whereas hardly influenced by gain recovery time of the SOA. In the experimental demonstration, the obtained RZ signal has an extinction ratio of 8.7dB and low pattern dependency. After conversion, the spectrum broadens obviously and shows multimode structure with spectrum interval of 0.08nm, which matches with the bit rate 10Gbit/s. Furthermore, this format conversion method has some tolerance on the pattern dependency of the clock signal.
Starting from the definition of the linewidth enhancement factor of the semiconductor optical amplifier (SOA), the linear relationships between nonlinear effects of cross-gain modulation (XGM), cross-phase modulation (XPM) and cross-polarization modulation (XPOM) in SOA are verified. Wavelength conversion based on XPOM in SOA is numerically analyzed using a simple rate equation model, which shows a high performance of this kind of converter. These results are practical for nonlinear applications of SOA. The advantages of this scheme include simple operation, inverted and non-inverted signal available, etc.
In this paper, a simple novel all-optical exclusive OR (XOR) logic gate architecture based on Sagnac interferometric loop mirror is proposed for the first time. Using Semiconductor Optical Amplifier (SOA) as nonlinear medium, and through numerical analysis, this scheme is proved to exceed the operation speed limit due to the limited carrier recovery time of the SOA. In order to optimize the operation performance of the proposed XOR logic scheme, the SOA parameters and the signal parameters are discussed. The operation of this scheme with 80Gb/s RZ pseudorandom bit sequences (PRBS) is simulated with fairly high performance.
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