| All-Optical Clock Recovery is a key function for the future all-optical network and the All-optical 3R (Re-amplification, Retiming, Reshaping) regeneration systems. The random appearance of code"0"in the data stream causes the pattern effect and increases the amplitude fluctuation of the clock pulses recovered. A novel device termed as Optical Code Mixer was presented to reduce the pattern effect by changing the probability distribution of the amplitude of the data pulses and reducing the amount of codes"0"and the codes"0"in series. The Optical Code Mixer has been applied for the National Patent of China. Mode-locked fiber lasers can be used to recover clock. They are also ideal sources to generate wavelength-tunable multi-wavelength optical pulses because of their large-gain bandwidths. In an actively mode-locked fiber laser, different sets of longitudinal modes compete for the gain medium and cause instability of wavelength. A method of stabilizing the wavelength of mode-locked fiber lasers by the injected continuous wave was presented.The methods and experiments presented in the thesis are mainly as follows:1. The method of changing the probability distribution of the amplitude of the data pulses by mixing the pulses after different time delay so as to reduce the pattern effect was presented. The function of the Optical Code Mixer was analyzed in both the time domain and the frequency domain. Based on the comb-like spectra of the F-P filter, the all-optical clock recovery improved by the Optical Code Mixer was simulated.In the experiment of all-optical clock recovery based on an injection mode-locked fibre ring laser, the clock recovered was improved by the Optical Code Mixer. The experiments of all-optical 3R regeneration were finished at the bit rate of both 10Gbit/s and 40 Gbit/s.2. A method of stabilizing the wavelength of mode-locked fiber lasers by the injected continuous wave was presented. The formula to calculate... |
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