Effects of the photonic sampling pulse width and the photodetection bandwidth on the channel response of photonic ADCs
- 12 January 2016
- journal article
- Published by Optica Publishing Group in Optics Express
- Vol. 24 (2), 924-34
- https://doi.org/10.1364/oe.24.000924
Abstract
We investigate the effects of the photonic sampling pulse's temporal width and the photodetection bandwidth on the channel response of time-interleaved photonic analog-to-digital converters (TIPADCs). Each sampling channel is modeled as a linear analog channel with a sampler, where the channel response is derived and analyzed theoretically. The results show that the finite temporal width of photonic sampling pulse will limit the channel analog bandwidth and the minimum feasible bandwidth of photodetection is the half of single channel sampling rate. The inter-symbol interference (ISI) induced by the finite bandwidth of photodetection will cause periodic ripples on the channel frequency response. Neither the photonic sampling with finite temporal width nor the ISI induced by the finite bandwidth of photodetection will result in excess noise. Experimental measurements on the channel responses of a TIPADC under different temporal widths and photodetection bandwidths verify the theoretical results.Funding Information
- National Natural Science Foundation of China (NSFC) (61127016, 61535006)
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