| Summary: | 碩士 === 國防大學中正理工學院 === 電子工程研究所 === 93 === In this thesis, The author investigates a phase mask combined with laser beam scanning techniques to fabricate a 50GHz fiber grating for optical communication systems. By adjusting suitable scanning parameters, the required specification of the international standard of ITU 50GHz fiber gratings can be realized. According to this parameter adjustment approach, the grating dispersion can be reduced for improving the performance of communication systems.
In the modern high speed communication systems, the bandwidth requirement has been emplasizer increased day by day. For satisfying the requirement, the dense wavelength division multiplexing (DWDM) technology is regarded as best solution, which both 100 and 50GHz systems are commonly adopted and the channel separations of 100 and 50GHz are 0.8 nm and 0.4 nm respectively. which can provide the optimize channel number for the maximum data-transmitted capacity. However, the fiber Bragg grating dispersion specification is a very important parameter to affect the message transmission capacity. The grating dispersion not only causes the light pulse to be broadened but also results in the neighbor channel signals overlapped each other to cause the decoding error and limit the transmission distance. Therefore, this thesis can provide the reference of designing and fabricating 50GHz fiber gratings for DWDM multiplexers. In terms of the phase mask writing technique and dispersion measurement/analysis.
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