| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 94 === The wavelength converter is a key component in all optical networks. The function of a wavelength converter is to convert the original signal from one wavelength to another wavelength. It can reduce the wavelength blocking problems and provide flexible services for optical networks. In this thesis, we utilize the cross-polarization modulation (CPM) mecha-nism in a semiconductor optical amplifier (SOA) to realize high-perfor-mance wavelength converters.
We first investigate the operation conditions and power dynamics for CPM wavelength converters. A CPM wavelength converter can have about 6-dB and 5-dB dynamic ranges for 1:1 and 1:2 wavelength conver-sion, respectively. The performance of XGM wavelength converters is also investigated for comparison with CPM wavelength converters.
From the transmission experiments, we obtain the clear eye patterns with less than 1-dB power penalty when the signal is CPM-converted and transmitted over 40-km distance. On the other hand, the signal converted by the XGM mechanism can only transmit for a short distance due to the positive chirp that enhances the dispersion effect via a SMF. In order to improve the performance of a XGM converter, we insert a CPM con-verter after the XGM converter in order to use the negative chirp to com-pensate the XGM converted signal. With this scheme, the XGM con-verted signal can be transmitted over 30-km transmission.
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