Abstract

This work demonstrates the feasibility of the generation of an RF direct-detection vector signal using optical in-phase/quadrature-phase (I/Q) upconversion. The advantage of the proposed transmitter is that no electrical mixer is needed to generate the RF signal. Therefore, I/Q data of RF signals are processed at baseband at the transmitter, which is independent of the carrier frequency of the generated RF signal. A 10Gb/s 16 quadrature amplitude modulation signal is experimentally demonstrated. Following transmission over a 50km single-mode fiber, the power penalty is negligible. Moreover, I/Q imbalance of the proposed transmitter is studied and compensated by digital signal processing, which is both numerically and experimentally verified.

© 2010 Optical Society of America

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References

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2008 (7)

2006 (1)

J. Yu, Z. Jia, L. Yi, G. K. Chang, and T. Wang, IEEE Photonics Technol. Lett. 18, 265 (2006).
[CrossRef]

2003 (1)

Candelas, P.

Chang, G. K.

J. Yu, Z. Jia, L. Yi, G. K. Chang, and T. Wang, IEEE Photonics Technol. Lett. 18, 265 (2006).
[CrossRef]

Chang, Q.

T. Ye, C. Yan, Q. Chang, and Y. Su, Opt. Commun. 281, 4648 (2008).
[CrossRef]

Corral, J. L.

Fatadin, I.

I. Fatadin, S. J. Savory, and D. Ives, IEEE Photonics Technol. Lett. 20, 1733 (2008).
[CrossRef]

Hong, X.

Hong, X. B.

Ives, D.

I. Fatadin, S. J. Savory, and D. Ives, IEEE Photonics Technol. Lett. 20, 1733 (2008).
[CrossRef]

Jia, Z.

J. Yu, Z. Jia, L. Yi, G. K. Chang, and T. Wang, IEEE Photonics Technol. Lett. 18, 265 (2006).
[CrossRef]

Li, J.

Li, J. Q.

Lin, J.

Lin, J. T.

Lin, Y. M.

Marti, J.

Piqueras, M. A.

Polo, V.

Sambaraju, R.

Savory, S. J.

I. Fatadin, S. J. Savory, and D. Ives, IEEE Photonics Technol. Lett. 20, 1733 (2008).
[CrossRef]

Su, Y.

T. Ye, C. Yan, Q. Chang, and Y. Su, Opt. Commun. 281, 4648 (2008).
[CrossRef]

Wang, T.

J. Yu, Z. Jia, L. Yi, G. K. Chang, and T. Wang, IEEE Photonics Technol. Lett. 18, 265 (2006).
[CrossRef]

Way, W. I.

Weng, C. K.

Wu, J.

Xu, K.

Yan, C.

T. Ye, C. Yan, Q. Chang, and Y. Su, Opt. Commun. 281, 4648 (2008).
[CrossRef]

Ye, T.

T. Ye, C. Yan, Q. Chang, and Y. Su, Opt. Commun. 281, 4648 (2008).
[CrossRef]

Yi, L.

J. Yu, Z. Jia, L. Yi, G. K. Chang, and T. Wang, IEEE Photonics Technol. Lett. 18, 265 (2006).
[CrossRef]

Yu, J.

J. Yu, Z. Jia, L. Yi, G. K. Chang, and T. Wang, IEEE Photonics Technol. Lett. 18, 265 (2006).
[CrossRef]

Zhang, Y.

Zhu, R.

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Figures (5)

Fig. 1
Fig. 1

Experimental setup of proposed optical I/Q upconversion system.

Fig. 2
Fig. 2

Concept of imbalance effect.

Fig. 3
Fig. 3

Simulation results of amplitude mismatch and conjugate misalignment.

Fig. 4
Fig. 4

Experimental imbalance results.

Fig. 5
Fig. 5

BER curves of a 10 Gb / s 16-QAM signal.

Equations (5)

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E out ( t ) = E o sin ( π I ( t ) / 2 V π ) cos ( ω c t ) + E o sin ( π Q ( t ) / 2 V π ) sin ( ω c t ) ,
E out ( t ) E o { J 0 ( m ) sin ( π I ( t ) / 2 V π ) cos ( ω c t ) + J 0 ( m ) sin ( π Q ( t ) / 2 V π ) sin ( ω c t ) 2 J 1 ( m ) cos ( ( ω c + ω RF ) t ) } ,
I photo = R J 0 ( m ) J 1 ( m ) E 0 2 [ sin ( π I ( t ) / 2 V π ) cos ( ω RF t ) sin ( π Q ( t ) / 2 V π ) sin ( ω RF t ) ] ,
I photo = ( π / 2 V π ) × R J 0 ( m ) J 1 ( m ) E 0 2 [ I ( t ) cos ( ω RF t ) Q ( t ) sin ( ω RF t ) ] .
I photo = ( π / 2 V π ) × R J 0 ( m ) J 1 ( m ) E 0 2 [ a I ( t ) cos ( ω RF t ) Q ( t ) sin ( ω RF t + θ ) ] ,

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