Abstract

An adaptive thresholding scheme in photonic analog-to-digital conversion is proposed and experimentally demonstrated. Instead of a single-ended electronic comparator, differential detection technology is used to reduce the quantization noise induced by thresholding error. The main advantages of this scheme are the elimination of the dynamic setting of thresholding level and better tolerance to common-mode noise.

© 2009 Optical Society of America

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References

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  1. G. C. Valley, Opt. Express 15, 1955 (2007).
    [CrossRef] [PubMed]
  2. H. Taylor, IEEE J. Quantum Electron. QE-15, 210 (1979).
    [CrossRef]
  3. J. Stigwall and S. Galt, J. Lightwave Technol. 24, 1247 (2006).
    [CrossRef]
  4. W. Li, H. Zhang, Q. Wu, Z. Zhang, and M. Yao, IEEE Photonics Technol. Lett. 19, 625 (2007).
    [CrossRef]
  5. Q. Wu, H. Zhang, M. Yao, and W. Zhou, IEEE Photonics Technol. Lett. 20, 1036 (2008).
    [CrossRef]
  6. H. Chi and J. Yao, Opt. Express 16, 567 (2008).
    [CrossRef] [PubMed]
  7. C. Sarantos and N. Dagli, The 20th Lasers and Electro-Optics Society (LEOS) Annual Meeting, paper MM2, p. 110 (IEEE, 2007).
  8. B. L. Shoop, Photonic Analog-to-Digital Conversion (Springer-Verlag, 2001).

2008 (2)

Q. Wu, H. Zhang, M. Yao, and W. Zhou, IEEE Photonics Technol. Lett. 20, 1036 (2008).
[CrossRef]

H. Chi and J. Yao, Opt. Express 16, 567 (2008).
[CrossRef] [PubMed]

2007 (2)

G. C. Valley, Opt. Express 15, 1955 (2007).
[CrossRef] [PubMed]

W. Li, H. Zhang, Q. Wu, Z. Zhang, and M. Yao, IEEE Photonics Technol. Lett. 19, 625 (2007).
[CrossRef]

2006 (1)

1979 (1)

H. Taylor, IEEE J. Quantum Electron. QE-15, 210 (1979).
[CrossRef]

Chi, H.

Dagli, N.

C. Sarantos and N. Dagli, The 20th Lasers and Electro-Optics Society (LEOS) Annual Meeting, paper MM2, p. 110 (IEEE, 2007).

Galt, S.

Li, W.

W. Li, H. Zhang, Q. Wu, Z. Zhang, and M. Yao, IEEE Photonics Technol. Lett. 19, 625 (2007).
[CrossRef]

Sarantos, C.

C. Sarantos and N. Dagli, The 20th Lasers and Electro-Optics Society (LEOS) Annual Meeting, paper MM2, p. 110 (IEEE, 2007).

Shoop, B. L.

B. L. Shoop, Photonic Analog-to-Digital Conversion (Springer-Verlag, 2001).

Stigwall, J.

Taylor, H.

H. Taylor, IEEE J. Quantum Electron. QE-15, 210 (1979).
[CrossRef]

Valley, G. C.

Wu, Q.

Q. Wu, H. Zhang, M. Yao, and W. Zhou, IEEE Photonics Technol. Lett. 20, 1036 (2008).
[CrossRef]

W. Li, H. Zhang, Q. Wu, Z. Zhang, and M. Yao, IEEE Photonics Technol. Lett. 19, 625 (2007).
[CrossRef]

Yao, J.

Yao, M.

Q. Wu, H. Zhang, M. Yao, and W. Zhou, IEEE Photonics Technol. Lett. 20, 1036 (2008).
[CrossRef]

W. Li, H. Zhang, Q. Wu, Z. Zhang, and M. Yao, IEEE Photonics Technol. Lett. 19, 625 (2007).
[CrossRef]

Zhang, H.

Q. Wu, H. Zhang, M. Yao, and W. Zhou, IEEE Photonics Technol. Lett. 20, 1036 (2008).
[CrossRef]

W. Li, H. Zhang, Q. Wu, Z. Zhang, and M. Yao, IEEE Photonics Technol. Lett. 19, 625 (2007).
[CrossRef]

Zhang, Z.

W. Li, H. Zhang, Q. Wu, Z. Zhang, and M. Yao, IEEE Photonics Technol. Lett. 19, 625 (2007).
[CrossRef]

Zhou, W.

Q. Wu, H. Zhang, M. Yao, and W. Zhou, IEEE Photonics Technol. Lett. 20, 1036 (2008).
[CrossRef]

IEEE J. Quantum Electron. (1)

H. Taylor, IEEE J. Quantum Electron. QE-15, 210 (1979).
[CrossRef]

IEEE Photonics Technol. Lett. (2)

W. Li, H. Zhang, Q. Wu, Z. Zhang, and M. Yao, IEEE Photonics Technol. Lett. 19, 625 (2007).
[CrossRef]

Q. Wu, H. Zhang, M. Yao, and W. Zhou, IEEE Photonics Technol. Lett. 20, 1036 (2008).
[CrossRef]

J. Lightwave Technol. (1)

Opt. Express (2)

Other (2)

C. Sarantos and N. Dagli, The 20th Lasers and Electro-Optics Society (LEOS) Annual Meeting, paper MM2, p. 110 (IEEE, 2007).

B. L. Shoop, Photonic Analog-to-Digital Conversion (Springer-Verlag, 2001).

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Figures (6)

Fig. 1
Fig. 1

Schematic illustration of PADC with single-ended comparator as (a) thresholder and (b) the proposed adaptive threshold scheme based on differential detection.

Fig. 2
Fig. 2

PADC transfer function with threshold level error.

Fig. 3
Fig. 3

Limitation on the ENOB as a function of the threshold level error, under certain optical powers, for a 4 - bit phase-shifted PADC system.

Fig. 4
Fig. 4

Experimental setup of phase-shifted PADC system with adaptive thresholding scheme.

Fig. 5
Fig. 5

4 × 10 GS s time- and wavelength-interleaved sampling pulses. The pulse trains corresponding to different wavelengths are shown in different colors, and the upper trace is the waveform of the multiplexed 4 × 10 GS s sampling pulses.

Fig. 6
Fig. 6

Observed differential optical pulses of the four wavelengths are superimposed on one trace in the 7th and 12th output channels.

Equations (5)

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Δ diff - i = 2 N Δ 2 π arcsin ( 2 n th - i R P optical - i R L ) ,
σ q 2 = + ϵ 2 p q ( q ) d q ,
σ q 2 = Δ 2 12 + i = 1 2 N 1 2 Δ diff - i 2 2 N = Δ 2 12 + i = 1 2 N 1 2 N Δ 2 2 π 2 arcsin ( 2 n th - i R P optical - i R L ) 2 .
b eff = SNR ( dB ) 1.76 6.02 .
b eff = 10 log ( 1 2 3 ( 2 2 N ) + i = 1 2 N 1 4 π 2 ( 2 N ) arcsin ( 2 n th - i R P optical - i R L ) 2 ) 1.76 6.02 .

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