Effects of the photonic sampling pulse width and the photodetection bandwidth on the channel response of photonic ADCs.

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.

[1]  R. Helkey,et al.  Phase-encoded optical sampling for analog-to-digital converters , 2000, IEEE Photonics Technology Letters.

[2]  Anatol Khilo,et al.  Progress in photonic analog-to-digital conversion , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[3]  Frederick J. O'Donnell,et al.  Optically sampled analog-to-digital converters , 2001 .

[4]  Guiling Wu,et al.  18 wavelengths 83.9Gs/s optical sampling clock for photonic A/D converters. , 2010, Optics express.

[5]  George C Valley,et al.  Photonic analog-to-digital converters. , 2007, Optics express.

[6]  A. Papoulis,et al.  Generalized sampling expansion , 1977 .

[7]  Paul W. Juodawlkis,et al.  Optical down-sampling of wide-band microwave signals , 2003 .

[8]  A. S. Bhushan,et al.  Photonic time stretch and its application to analog-to-digital conversion , 1999 .

[9]  Wasfy B. Mikhael,et al.  Time interleaved analog to digital converters: Tutorial 44 , 2013, IEEE Instrumentation & Measurement Magazine.

[10]  George C. Valley.  Photonic analog-to-digital converters. , 2007 .

[11]  Jie Sun,et al.  Photonic ADC: overcoming the bottleneck of electronic jitter. , 2012, Optics express.

[12]  George C. Valley,et al.  Photonic analog-to-digital converters: fundamental and practical limits , 2004, SPIE Security + Defence.

[13]  K.J. Williams,et al.  Sampled Analog Optical Links , 2009, IEEE Transactions on Microwave Theory and Techniques.

[14]  J.U. Kang,et al.  Performance of a time- and wavelength-interleaved photonic sampler for analog-digital conversion , 1999, IEEE Photonics Technology Letters.

[15]  Paul W. Juodawlkis,et al.  Impact of photodetector nonlinearities on photonic analog-to-digital converters , 2002, CLEO 2002.