Abstract

We describe a novel SOA-based all-optical pure-phase modulator, and show how deleterious cross-gain modulation from the SOAs can be suppressed by utilizing an integrated interferometer structure. We experimentally demonstrate the use of the optical gate as a π/4 phase modulator producing 21.3 Gbaud 8PSK from 21.3 Gbit/s OOK and 21.3 Gbaud QPSK inputs. The modulator produces 3 dB of gain and coherent detection-based bit error rate measurements indicate a 2.4 dB excess penalty.

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2010

2009

2007

2004

1996

T. Durhuus, B. Mikkelsen, C. Joergensen, S. Lykke Danielsen, and K. E. Stubkjaer, “All-optical wavelength conversion by semiconductor optical amplifiers,” J. Lightwave Technol. 14(6), 942–954 (1996).
[CrossRef]

Dailey, J. M.

Durhuus, T.

T. Durhuus, B. Mikkelsen, C. Joergensen, S. Lykke Danielsen, and K. E. Stubkjaer, “All-optical wavelength conversion by semiconductor optical amplifiers,” J. Lightwave Technol. 14(6), 942–954 (1996).
[CrossRef]

Essiambre, R. J.

Foschini, G. J.

Freude, W.

Goebel, B.

Hatta, T.

Igarashi, K.

Ishida, K.

Jin, W.

Joergensen, C.

T. Durhuus, B. Mikkelsen, C. Joergensen, S. Lykke Danielsen, and K. E. Stubkjaer, “All-optical wavelength conversion by semiconductor optical amplifiers,” J. Lightwave Technol. 14(6), 942–954 (1996).
[CrossRef]

Katoh, K.

Kikuchi, K.

Kim, C.

Kitagawa, S.

Kitayama, K.

Koch, T. L.

Kramer, G.

Leuthold, J.

Li, G.

Lykke Danielsen, S.

T. Durhuus, B. Mikkelsen, C. Joergensen, S. Lykke Danielsen, and K. E. Stubkjaer, “All-optical wavelength conversion by semiconductor optical amplifiers,” J. Lightwave Technol. 14(6), 942–954 (1996).
[CrossRef]

Magill, P. D.

Maitra, A.

Maruta, A.

Mikkelsen, B.

T. Durhuus, B. Mikkelsen, C. Joergensen, S. Lykke Danielsen, and K. E. Stubkjaer, “All-optical wavelength conversion by semiconductor optical amplifiers,” J. Lightwave Technol. 14(6), 942–954 (1996).
[CrossRef]

Mishina, K.

Mitani, S.

Mori, Y.

Nissanka, S. M.

Poulton, C. G.

Qian, D.

Shimizu, K.

Stubkjaer, K. E.

T. Durhuus, B. Mikkelsen, C. Joergensen, S. Lykke Danielsen, and K. E. Stubkjaer, “All-optical wavelength conversion by semiconductor optical amplifiers,” J. Lightwave Technol. 14(6), 942–954 (1996).
[CrossRef]

Wang, T.

Winzer, P. J.

Yu, J.

Zhang, C.

Zhang, G.

Zhou, X.

J. Lightwave Technol.

Opt. Express

Other

C. Schmidt-Langhorst, R. Ludwig, D.-D. Gross, L. Molle, M. Seimetz, R. Freund, and C. Schubert, “Generation and Coherent Time-Division Demultiplexing of up to 5.1 Tb/s Single-Channel 8-PSK and 16-QAM Signals,” in Optical Fiber Communications Conference, OSA Technical Digest (CD) 2009, Paper PDPC6.

N. Kikuchi and S. Sasaki, “Improvement of chromatic dispersion and differential group delay tolerance of incoherent multilevel signaling with receiver-side digital signal processing,” in Optical Fiber Communication Conference, OSA Technical Digest (CD) 2010, Paper OWV6.

M. Nakamura, Y. Kamio, and T. Miyazaki, “M-PSK Versatile Modulation Using a Single-Electrode Straight-Line Phase Modulator and Digital Signal Processing for ISI-Suppression,” in Optical Fiber Communication Conference, OSA Technical Digest (CD) 2010, Paper OMK8.

S. Tsukamoto, K. Katoh, and K. Kikuchi, “Coherent demodulation of optical 8-phase shift-keying signals using homodyne detection and digital signal processing,” in Optical Fiber Communication Conference, OSA Technical Digest (CD) 2006, Paper OThR5.

E. Tipsuwannakul, M. Skold, M. Karlsson, and P. Andrekson, “Transmission of 240 Gb/s PM-RZ-D8PSK over 320 km in 10 Gb/s NRZ-OOK WDM System,” in Optical Fiber Communication Conference, OSA Technical Digest (CD) 2010, Paper OMJ2.

T. Sakamoto, A. Chiba, and T. Kawanishi, “Electro-Optic Synthesis of 8PSK by Quad-Parallel Mach-Zehnder Modulator,” in Optical Fiber Communication Conference, OSA Technical Digest (CD) 2009, Paper OTuG4.

I. Kang, M. Rasras, L. Buhl, M. Dinu, S. Cabot, M. Cappuzzo, L. T. Gomez, Y. F. Chen, S. S. Patel, N. Dutta, A. Piccirilli, J. Jaques, and C. R. Giles, “Generation of 173-Gbits/s single-polarization QPSK signals by all-optical format conversion using a photonic integrated device,” in 35th European Conference on Optical Communication, (2009), Paper 10.3.1.

I. P. Kaminow, T. Li, and A. E. Willner, Optical Fiber Telecommunications V A: Components and Subsystems (Academic Press, 2008). Ch. 7.

I. Kang, M. S. Rasras, L. Buhl, M. Dinu, G. Raybon, S. Cabot, M. A. Cappuzzo, L. Gomez, Y. Chen, S. S. Patel, A. Piccirilli, J. Jaques, and C. R. Giles, “High-Speed All-Optical Generation of Advanced Modulation Formats Using Photonic-Integrated All-Optical Format Converter,” IEEE Journal of Selected Topics in Quantum Electronics, Published Online, http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5771528 .

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Figures (4)

Fig. 1
Fig. 1

SOA-based MZI all-optical phase modulator. Control of the phase bias allows effective suppression of the deleterious XGM.

Fig. 2
Fig. 2

(a) The normalized output powers from the MZI as a function of static phase shift, φ. H0 (solid line) is calculated from Eq. (2). H1A, H1B, and H1C (dashed lines) are calculated from Eq. (3) using α = 106 (i.e. ∞), 5, and 2, respectively. The XPM shift (δφ), is 0.5∙π in all three cases. (b) The relative phase angle between H1 and H0 as a function of static phase, φ. The three plots correspond with the three α-factor values in (a).

Fig. 3
Fig. 3

Experimental setup used to test the all-optical phase modulator.

Fig. 4
Fig. 4

(a) BER curves for the two input QPSK TDM tributaries (triangles), the two QPSK tributaries after the all-optical modulator when the OOK pump is turned off (circles), and the two 8PSK output tributaries (squares). The received power is the total power for both tributaries and is measured at the input to the “Noise Loading” EDFA shown in Fig. 3. (b) Histogram generated from a measured 8PSK signal constellation.

Equations (5)

Equations on this page are rendered with MathJax. Learn more.

α= 4π λ δn δg =2 δφ 1n{ G f / G i }
H 0 = 1 2 [1+ e jφ ]
H 1 = 1 2 [1+ e δφ/α e j(φ+δφ) ]
θ A = H 1A H 0
α eff =2 θ 1n{| H 1 | 2 /| H 0 | 2 }

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