A 10GHz PLL Phase Shifter Based Circuitry for Frequency Stabilization and Delay-Time Tuning of Mode-Locked Fiber Lasers

• Main Authors: Wen-Chin Lee, 李文進
• Other Authors: Hao-Chung Kuo
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/54492355150402907070

碩士 === 國立交通大學 === 電機資訊學院碩士在職專班 === 92 === With the evolution of modern electronic technology and communication system came the need to provide stable oscillation and continuous phase shift at particular frequencies. Continuously tuning the phase of microwave signal or optical clock via optical or optoelectronic technique has been extensively studied since its particular applications in phased-array antennas (PAAs), wireless/fiber communication and electro-optic sampling (EOS) system. In this thesis, we demonstrate a 10GHz electronic type digital phase locked loop with phase shifter (DPLL-PS) based circuitry for frequency stabilization and delay-time tuning of mode-locked fiber lasers. We propose the electronic type DPLL-PS to establish the phase continuous tunable, operation easily and high phase lock stability and especially to improve the drawback of limited bandwidth up to Ku band range. This thesis consists of three main parts: the first introduces the concept of phase locked loop and operation principle of phase shifter. The second part describes briefly the methods of mode-locked fiber lasers. The third part demonstrates the implementation and test results. In our research, the maximum phase deviation is up to 723o under the change in controlling voltage of 8.0 volts, which is completely independent of operating frequency. A linear transferred function of the DPLL-PS with responsivity of 90.375 o/volt was measured. The phase fluctuation of the DPLL-PS can be as small as 0.022o.