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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 25, Iss. 12 — Dec. 1, 2007
  • pp: 3716–3721

Distortion Cancellation in Time-Stretch Analog-to-Digital Converter

Shalabh Gupta, George C. Valley, and Bahram Jalali

Journal of Lightwave Technology, Vol. 25, Issue 12, pp. 3716-3721 (2007)


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Abstract

We show that the symmetry properties of the two outputs from a push–pull Mach–Zehnder modulator can be exploited to reject dispersion-induced second-order distortions in the time-stretch analog-to-digital converter (TS-ADC). Using differential operation and signal processing in the digital domain, we experimentally demonstrate suppression of the signal harmonics generated due to system nonlinearities. Simulations predict that distortion-limited dynamic range improves from 34 to 57 dB. In addition, differential signaling improves the signal-to-noise ratio (SNR) by 3 dB and rejects an even-order nonlinear distortion added by an electronic digitizer in the TS-ADC. It is also shown that this approach is robust even in the presence of mismatches in the differential signal paths. In general, the approach can also be applied to any ultrawideband (multioctave) optical link to obtain a high dynamic-range system.

© 2007 IEEE

Citation
Shalabh Gupta, George C. Valley, and Bahram Jalali, "Distortion Cancellation in Time-Stretch Analog-to-Digital Converter," J. Lightwave Technol. 25, 3716-3721 (2007)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-25-12-3716

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