Abstract

A novel approach to transmitting two vector signals using a single optical carrier based on IQ modulation and coherent detection is proposed and demonstrated. In the proposed system, two quadrature phase-shift keying (QPSK) signals are IQ modulated on an optical carrier with one polarization state using a dual-parallel Mach–Zehnder modulator (DP-MZM). The optical carrier with an orthogonal polarization state is not modulated but transmitted with the modulated optical wave. At the receiver, the two orthogonally polarized light waves are separated and sent to a coherent detector, where the two QPSK signals are separated and demodulated. An experiment is performed. The transmission of two QPSK signals at 2 GHz with a data rate of 1 Gbps is implemented over a 25 km single-mode fiber. The performance of the transmission in terms of error vector magnitude is evaluated.

© 2014 Optical Society of America

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References

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2013 (1)

A. L. Yi, L. S. Yan, C. Liu, M. Zhu, J. Wang, L. Zhang, C. H. Ye, and G. K. Chang, IEEE Photon. J. 5, 7200807 (2013).
[CrossRef]

2012 (2)

R. Q. Shaddad, A. B. Mohammad, and A. M. Al-hetar, Opt. Commun. 285, 4059 (2012).
[CrossRef]

M. Zhu, L. Zhang, S. H. Fan, C. Su, G. Gu, and G. K. Chang, IEEE Photon. Technol. Lett. 24, 1127 (2012).
[CrossRef]

2011 (1)

2010 (1)

2009 (4)

2008 (1)

Al-hetar, A. M.

R. Q. Shaddad, A. B. Mohammad, and A. M. Al-hetar, Opt. Commun. 285, 4059 (2012).
[CrossRef]

Alphones, A.

Barros, D. J. F.

Cabon, B.

Chang, C. H.

Chang, G. K.

A. L. Yi, L. S. Yan, C. Liu, M. Zhu, J. Wang, L. Zhang, C. H. Ye, and G. K. Chang, IEEE Photon. J. 5, 7200807 (2013).
[CrossRef]

M. Zhu, L. Zhang, S. H. Fan, C. Su, G. Gu, and G. K. Chang, IEEE Photon. Technol. Lett. 24, 1127 (2012).
[CrossRef]

G. K. Chang, A. Chowdhury, Z. S. Jia, H. C. Chien, M. F. Huang, J. J. Yu, and G. Ellinas, J. Opt. Commun. Netw. 1, C35 (2009).
[CrossRef]

Chen, J.

Chen, J. J.

Chen, Y. H.

Chi, S.

Chien, H. C.

Chowdhury, A.

Csörnyei, M.

Ellinas, G.

Fan, S. H.

M. Zhu, L. Zhang, S. H. Fan, C. Su, G. Gu, and G. K. Chang, IEEE Photon. Technol. Lett. 24, 1127 (2012).
[CrossRef]

Gomes, N. J.

Gu, G.

M. Zhu, L. Zhang, S. H. Fan, C. Su, G. Gu, and G. K. Chang, IEEE Photon. Technol. Lett. 24, 1127 (2012).
[CrossRef]

Ho, C. H.

Huang, M. F.

Iezekiel, S.

Ip, E.

Jia, Z. S.

Jiang, W. J.

Kahn, J. M.

Lau, A. P. T.

Lethien, C.

Lin, C. T.

Liu, C.

A. L. Yi, L. S. Yan, C. Liu, M. Zhu, J. Wang, L. Zhang, C. H. Ye, and G. K. Chang, IEEE Photon. J. 5, 7200807 (2013).
[CrossRef]

Liu, W. C.

Lu, H. H.

Mitchell, J. E.

Mohammad, A. B.

R. Q. Shaddad, A. B. Mohammad, and A. M. Al-hetar, Opt. Commun. 285, 4059 (2012).
[CrossRef]

Morant, M.

Peng, P. C.

Shaddad, R. Q.

R. Q. Shaddad, A. B. Mohammad, and A. M. Al-hetar, Opt. Commun. 285, 4059 (2012).
[CrossRef]

Shih, P. T.

Stöhr, A.

Su, C.

M. Zhu, L. Zhang, S. H. Fan, C. Su, G. Gu, and G. K. Chang, IEEE Photon. Technol. Lett. 24, 1127 (2012).
[CrossRef]

Wang, J.

A. L. Yi, L. S. Yan, C. Liu, M. Zhu, J. Wang, L. Zhang, C. H. Ye, and G. K. Chang, IEEE Photon. J. 5, 7200807 (2013).
[CrossRef]

Wang, J. B.

Wei, C. C.

Wong, E. Z.

Wu, P. Y.

Yan, L. S.

A. L. Yi, L. S. Yan, C. Liu, M. Zhu, J. Wang, L. Zhang, C. H. Ye, and G. K. Chang, IEEE Photon. J. 5, 7200807 (2013).
[CrossRef]

Ye, C. H.

A. L. Yi, L. S. Yan, C. Liu, M. Zhu, J. Wang, L. Zhang, C. H. Ye, and G. K. Chang, IEEE Photon. J. 5, 7200807 (2013).
[CrossRef]

Yi, A. L.

A. L. Yi, L. S. Yan, C. Liu, M. Zhu, J. Wang, L. Zhang, C. H. Ye, and G. K. Chang, IEEE Photon. J. 5, 7200807 (2013).
[CrossRef]

Yu, J. J.

Zhang, L.

A. L. Yi, L. S. Yan, C. Liu, M. Zhu, J. Wang, L. Zhang, C. H. Ye, and G. K. Chang, IEEE Photon. J. 5, 7200807 (2013).
[CrossRef]

M. Zhu, L. Zhang, S. H. Fan, C. Su, G. Gu, and G. K. Chang, IEEE Photon. Technol. Lett. 24, 1127 (2012).
[CrossRef]

Zhu, M.

A. L. Yi, L. S. Yan, C. Liu, M. Zhu, J. Wang, L. Zhang, C. H. Ye, and G. K. Chang, IEEE Photon. J. 5, 7200807 (2013).
[CrossRef]

M. Zhu, L. Zhang, S. H. Fan, C. Su, G. Gu, and G. K. Chang, IEEE Photon. Technol. Lett. 24, 1127 (2012).
[CrossRef]

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Figures (5)

Fig. 1.
Fig. 1.

Conceptual diagram illustrating microwave vector signal transmission based on IQ modulation and coherent detection. LD, laser diode; De-MUX, demultiplexer; PBS, polarization beam splitter; DP-MZM, dual-parallel Mach–Zehnder modulator; PBC, polarization beam combiner; MUX, multiplexer; EDFA, erbium-doped fiber amplifier; SMF, single-mode fiber.

Fig. 2.
Fig. 2.

Principle of the coherent detector. The coherent detector consists of an optical hybrid and two pairs of PDs.

Fig. 3.
Fig. 3.

Experimental setup for vector signal transmission and detection. LD, laser diode; PC, polarization controller; PBS, polarization beam splitter; DP-MZM, dual-parallel Mach–Zehnder modulator; AWG, arbitrary waveform generator; PBC, polarization beam combiner; EDFA, erbium-doped fiber amplifier; OBPF, optical bandpass filter; SMF, single-mode fiber; DSO, digital sampling oscilloscope.

Fig. 4.
Fig. 4.

Constellation diagrams of the two QPSK signals at different received optical power.

Fig. 5.
Fig. 5.

EVM curve versus received optical power. BTB, back-to-back; SMF, single-mode fiber.

Equations (8)

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Ex(t)=12Ex[cos(π(2I(t)Vπ)2Vπ)exp(jωct)+cos(π(2Q(t)Vπ)2Vπ)exp(jωct+jπ2)]12Ex[γI(t)exp(jωct)+γQ(t)exp(jωct+jπ2)],
Ey(t)=Eyexp(jωct),
E1(t)=Ex(t)+Ey(t),
E2(t)=Ex(t)+Ey(t)exp(jπ),
E3(t)=Ex(t)+Ey(t)exp(jπ/2),
E4(t)=Ex(t)+Ey(t)exp(jπ/2).
iupper(t)=E1(t)E1*(t)E2(t)E2*(t)=2ExEyγI(t).
ilower(t)=E3(t)E3*(t)E4(t)E4*(t)=2ExEyγQ(t).

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