In this paper, an integratable spectrum quantization schema for all-optical analog-to-digital conversion (AOADC) is demonstrated in Ge<sub>11.5</sub>As<sub>24</sub>Se<sub>64.5</sub> rib film waveguide by slicing the supercontinuum. Owing to the high nonlinearity coefficient of 137.8 W<sup>-1</sup>m<sup>-1</sup>, the input pulse peak power are very low which varies from 540 to 900mW and then the broadened spectrum is filtered with an arrayed waveguide grating. As a result, 4-bit quantization resolution along with effective number of bit (ENOB) of 3.985 and a signal-to-noise ratio of 23.99 dB are achieved. It is believed that this proposed schema is suitable for integratable AOADC with low power consumption.
We propose a scheme for the real-time optical sampling of a multicast signal based on the parametric process. The linearly chirped and time-broadened pulses are used instead of the traditional mode-locked sampling pulses. The amount of signal copies or the rate of sampling train can be efficiently reduced by the chirped pulses while keeping a high-equivalent sampling rate. Simulation results show that the equivalent sampling rate of 120 GSa/s can be obtained by using only a sampling source of 10 GHz together with three signal copies. This scheme can efficiently improve the sampling rate in the real-time optical sampling and reduce the requirement on electronic devices for signal processing.