We present a scheme for recovering a 10-GHz clock from a 40- and 80-Gb/s time-division-multiplexed (TDM) return-to-zero (RZ) data stream. The proposed clock recovery is successfully demonstrated using an electrical phase-locked loop (PLL). The jitter of the recovered clock is estimated to be around 50 fs. The key part in the proposed clock recovery circuit is a LiNbO3 Mach-Zehnder modulator, which is shown to be highly effective in optical to electrical down conversion.
In this paper, we present a scheme for recovering 10 GHz clock from 40 Gb/s and 80 Gb/s time division multiplexed (TDM) return to zero (RZ) data stream. The proposed clock recovery is successfully demonstrated using an electrical phase locked loop (PLL). The jitter of the recovered clock is estimated to be around 50 fs. The key part in the proposed clock recovery circuit is a LiNbO3 Mach-Zehnder modulator which is shown to be highly effective in optical to electrical down conversion.
Pulses with approximately 200 fs pulse width were generated by using a two stage pulse compression mechanism of gain- switched DFB laser pulses which were originally approximately 10 ps long. The pulse compression mechanism utilizes fiber nonlinearities and it involves propagation through specific lengths of various types of fiber and a nonlinear loop mirror. Simulation of the whole compression scheme by solving the nonlinear Schrodinger equation using the split step method shows good agreement with the experiment results.
In this work we have demonstrated that a single pulse generator, which cascaded two LiNbO3 modulators serially, may be used to demultiplex or drop a 10 Gb/s channel from a 40 Gb/s transmission system. The parts in the experiment are all commercially available, and this technique is scalable to higher speed transmission system.
Wavelength tunable pulses with ~ 200 fs pulse width were generated by using a two stage pulse compression mechanism of gain-switched DFB laser pulses which were originally ~ 10 ps long. The pulse compression mechanism utilizes fiber nonlinearities and it involves propagation through specific lengths of various types of fiber and a nonlinear loop mirror. Simulation of the entire compression scheme by solving the nonlinear Schrodinger equation shows good agreement with the experiment results.
All optical XOR functionality has been demonstrated experimentally using an integrated SOA-based Mach-Zehnder interferometer (SOA-MZI) at 20 Gb/s. The performance of the XOR results has been analyzed by solving the rate equation of the SOA numerically. The high-speed operation is limited by the carrier lifetime in the SOA. In order to solve the limitations imposed by carrier lifetime, a differential scheme for XOR operation has been experimentally investigated. This scheme is potentially capable of XOR operation to > 100 Gb/s.
The master equation of the actively mode-locked fiber laser is theoretically derived from the time domain for both of the harmonic and rational harmonic AM mode-locked cases when the RF modulating signal is not exactly tuned to the cavity length. It is shown that the existence of the introcavity dispersion will affect the pulse train properties as a function of the normalized detuning. The properties of the pulse train that depend on detuning are the carrier wavelength, the pulse width, the relative phase lag and the frequency chirp.
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