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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 22 — Aug. 1, 2009
  • pp: 4458–4467

Photonic analog-to-digital converter using Mach–Zehnder modulators having identical half-wave voltages with improved bit resolution

Shuna Yang, Chao Wang, Hao Chi, Xianmin Zhang, Shilie Zheng, Xiaofeng Jin, and Jianping Yao  »View Author Affiliations


Applied Optics, Vol. 48, Issue 22, pp. 4458-4467 (2009)
http://dx.doi.org/10.1364/AO.48.004458


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Abstract

A novel approach to perform photonic analog-to-digital conversion with improved bit resolution is proposed and investigated. Instead of using Mach–Zehnder modulators (MZMs) with geometrically-scaled half-wave voltages, the MZMs in the approach have identical half-wave voltages, which greatly simplifies the implementation. To improve the bit resolution without increasing the number of MZMs, each MZM is connected with multiple comparators having multiple thresholds. The quantization and encoding are performed based on the symmetrical number system (SNS) technique. Three new quantization and encoding schemes based on the SNS are proposed and demonstrated. A 4 bit photonic analog-to-digital conversion based on the given schemes is investigated. For the given schemes, two MZMs are needed with the numbers of comparators being 14, 16, and 9, respectively. Numerical simulations and experiments are performed. The effectiveness of the proposed schemes is verified.

© 2009 Optical Society of America

OCIS Codes
(060.2360) Fiber optics and optical communications : Fiber optics links and subsystems
(230.0250) Optical devices : Optoelectronics

ToC Category:
Optical Devices

History
Original Manuscript: February 24, 2009
Revised Manuscript: July 15, 2009
Manuscript Accepted: July 16, 2009
Published: July 27, 2009

Citation
Shuna Yang, Chao Wang, Hao Chi, Xianmin Zhang, Shilie Zheng, Xiaofeng Jin, and Jianping Yao, "Photonic analog-to-digital converter using Mach-Zehnder modulators having identical half-wave voltages with improved bit resolution," Appl. Opt. 48, 4458-4467 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-22-4458


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