Abstract

A means to achieve all-optical broadband demodulation of subcarrier back into digital data in an upstream link of a millimeter-wave radio over fiber (RoF) system is proposed and demonstrated experimentally. In the central station, the subcarrier from the base station of RoF system can be demodulated in the optical domain directly, without any millimeter-wave electronic device. Using this approach, the rf power degradation can be avoided even when the base stations in systems employ the conventional simple double-sideband modulation. Therefore, an inexpensive and simple configuration of the uplink for broadband signal receiving can be realized.

© 2007 Optical Society of America

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References

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  1. P. Smulders, IEEE Commun. Mag. 40(1), 140 (2002).
    [CrossRef]
  2. Y. Song, X. Zheng, W. Wang, H. Zhang, and B. Zhou, Opt. Lett. 31, 3234 (2006).
    [CrossRef] [PubMed]
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    [CrossRef]
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    [CrossRef]
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  6. P. F. M. Smulders, in Proceedings of IEEE Benelux Chapter Symposium on Communications and Vehicular Technology (IEEE-LEOS, 2003).
  7. G. H. Smith, D. Novak, and Z. Ahmed, IEEE Trans. Microwave Theory Tech. 45, 1410 (1997).
    [CrossRef]

2006 (1)

2004 (1)

C. Xu, X. Liu, and X. Wei, IEEE J. Sel. Top. Quantum Electron. 10, 281 (2004).
[CrossRef]

2002 (1)

P. Smulders, IEEE Commun. Mag. 40(1), 140 (2002).
[CrossRef]

1997 (1)

G. H. Smith, D. Novak, and Z. Ahmed, IEEE Trans. Microwave Theory Tech. 45, 1410 (1997).
[CrossRef]

1995 (1)

P. D. Sargis, R. E. Haigh, K. G. McCammon, and S. Young, Electron. Lett. 31, 1769 (1995).
[CrossRef]

Electron. Lett. (1)

P. D. Sargis, R. E. Haigh, K. G. McCammon, and S. Young, Electron. Lett. 31, 1769 (1995).
[CrossRef]

IEEE Commun. Mag. (1)

P. Smulders, IEEE Commun. Mag. 40(1), 140 (2002).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron. (1)

C. Xu, X. Liu, and X. Wei, IEEE J. Sel. Top. Quantum Electron. 10, 281 (2004).
[CrossRef]

IEEE Trans. Microwave Theory Tech. (1)

G. H. Smith, D. Novak, and Z. Ahmed, IEEE Trans. Microwave Theory Tech. 45, 1410 (1997).
[CrossRef]

Opt. Lett. (1)

Other (2)

R. Griffin and A. Carter, in Optical Fiber Communication Conference (OFC) (Optical Society of America, 2002), pp. 17-22, paper WX6.

P. F. M. Smulders, in Proceedings of IEEE Benelux Chapter Symposium on Communications and Vehicular Technology (IEEE-LEOS, 2003).

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Figures (7)

Fig. 1
Fig. 1

Application of demodulation module in upstream link of RoF system.

Fig. 2
Fig. 2

Spectrum of the demodulation system. (a) Spectrum of RF signal. (b) Spectrum before optical filter. (c) Spectrum after the optical filter.

Fig. 3
Fig. 3

Experimental setup of all-optical subcarrier demodulation, the Δ λ corresponds to the frequency of the subcarrier. The modulation signal generated by DPSK modulator in this system plays the role of the signal received from a mobile customer unit.

Fig. 4
Fig. 4

Numerical study result, a 10 Gbits s PRBS data are applied in the system. (a) Optical spectrum of the residual optical sideband. (b) Eye diagram of detected baseband data signal.

Fig. 5
Fig. 5

We combine an optical polarization rotation filter (OPRF) and an FBG into a filter with suitable filtering spectrum, as the optical filter shown in Fig. 3, to cancel the carrier and one of the sidebands.

Fig. 6
Fig. 6

(a) Optical spectrum before the 1   bit delay module, the x axis is 0.06 nm div , the y axis is 5 dB div . The resolution bandwidth is 0.02 nm . (b) Eye diagram on oscilloscope when transiting a 1.5 Gbits s PRBS over the system, the x axis is 200 ps div , the y axis is 50 mV div .

Fig. 7
Fig. 7

Receiver sensitivity in transmission experiment.

Equations (3)

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F rf = F ( ω ) + F ( ω ) ,
F opt ( ω ) = ( 1 + m F ( ω ) + m F ( ω ) ) * ( δ ν OPT + δ ν OPT ) = δ ν OPT + δ ν OPT + m F ( ν OPT + ω ) + m F ( ν OPT ω ) + m F ( ν OPT + ω ) + m F ( ν OPT ω ) ,
F residual ( ω ) = m F ( ω ν OPT ) + m F ( ω ν OPT ) .

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