Abstract

Abstract: We experimentally demonstrate the simultaneous detection of 10-Gbit/s quadrature phase shift keying (QPSK) × 2-channel Fourier-encoded synchronous optical code division multiplexing (FE-SOCDM) signals using a digital coherent receiver, for the first time. First, we analytically verify that simultaneous detection can be achieved with an N-point discrete Fourier transform (DFT) using digital signal processing (DSP) because the N-channel Fourier encoding corresponds to an N × N inverse DFT, then the operation is experimentally confirmed. Simultaneous detection of 10-Gbit/s QPSK × 2-channel FE-SOCDM signals is evaluated. The proposed scheme dramatically expands the capability of OCDM systems.

© 2013 OSA

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References

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2012 (1)

2011 (4)

2010 (1)

2009 (1)

2006 (1)

Chen, C.

Choi, Y. K.

Cincotti, G.

Cvijetic, M.

Cvijetic, N.

Feng, Y.

Hanawa, M.

Hosoya, K.

Huang, M. F.

Huang, Y. K.

Ip, E.

Kataoka, N.

Katoh, K.

Kikuchi, K.

Kitayama, K.

Kodama, T.

Lee, C. G.

Ly-Gagnon, D.-S.

Miyazaki, T.

Park, C. S.

Qiu, K.

Sakamoto, A.

Shao, Y.

Terada, Y.

Tsukamoto, S.

Wada, N.

Wang, T.

Wang, X.

Zhang, C.

J. Lightwave Technol. (2)

Opt. Express (6)

Other (4)

M. Hanawa, Y. Okamura, S. Nozaki, and K. Hosoya, “Experimental demonstration of optical concatenated coding enabling channel grouping on OCDM networks,” in International Conference on Optical Internet 2010 (COIN 2010), Korea, 383–385 (2010).

M. Hanawa, S. Nozaki, K. Hosoya, Y. Okamura, and K. Nonaka, “BER characteristics of 2ch OOK-OCDM using 16-chip concatenated Fourier code,” in Opto-Electronics and Communications Conference (OECC 2011), Taiwan, 24–25 (2011).

M. Hanawa, “Fourier code: A novel orthogonal code for OCDM systems,” in Opto-Electronics and Communications Conference and Australian Conference on Optical Fibre Technology (OECC/ACOFT’ 2008), Sydney, 1–2 (2008).

M. Hanawa, K. Nakamura, and K. Osada, “Structure identification of superstructure fiber Bragg gratings by the least mean square algorithm,” in Opto-Electronics and Communications Conference (OECC 2005), Korea, 820–821 (2005).

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Figures (8)

Fig. 1
Fig. 1

Simultaneous detection of the FE-SOCDM signals with a digital coherent receiver.

Fig. 2
Fig. 2

Numerical simulation model.

Fig. 3
Fig. 3

Constellation maps of received signals. (a) Original QPSK signal. (b) Fourier-encoded signal with codeword c1. (c) 4-ch. FE-SOCDM signal.

Fig. 4
Fig. 4

Configuration for simultaneous detection of the Fourier-encoded/FE-SOCDM signals.

Fig. 5
Fig. 5

Structure and reflection spectra of FBG-OCs. (a) Configuration of the FBG-OC. (b) Reflection spectra of FBG-OCs used for the experiments. Solid and dashed lines show the measured and theoretical reflection spectra, respectively.

Fig. 6
Fig. 6

Waveforms of the Fourier-encoded signals. (a) Encoded with codeword c1. (b) Encoded with codeword c2. (c) Encoded with codeword c3. (d) Encoded with codeword c4.

Fig. 7
Fig. 7

Constellation maps of detected signals. (a) Simulation results. (b) Experimental results.

Fig. 8
Fig. 8

Constellation maps of detected signals of the 10-Gbit/s QPSK × 2-channel FE-SOCDM signals. (a) Simulation results. (b) Experimental results.

Equations (8)

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s n = E n e j θ n n=1,2,3,,N
F N =[ exp( j 2π( n1 )( k1 ) N ) ]n,k=1,2,...,N.
F 4 =[ e j0 e j0 e j0 e j0 e j0 e j π 2 e jπ e j 3π 2 e j0 e jπ e j2π e j3π e j0 e j 3π 2 e j3π e j 9π 2 ]=[ +1 +1 +1 +1 +1 +j 1 j +1 1 +1 1 +1 j 1 +j ]=[ c 1 c 2 c 3 c 4 ]
g n = s n [ e j0 e j π( n1 ) 2 e jπ( n1 ) e j 3π( n1 ) 2 ] n=1,2,3,4.
x= g 1 + g 2 + g 3 + g 4 = s T F 4 wheres=[ s 1 s 2 s 3 s 4 ].
y=D s T F 4 .
y T = F 4 s D T .
r= F 4 1 F 4 s D T =s D T .

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