Abstract

We propose and demonstrate a reconfigurable multilevel transmitter using a monolithically-integrated quad Mach-Zehnder in-phase/quadrature (QMZ-IQ) modulator with binary driving electronics. Different from previous parallel-integrated quadrature amplitude modulation (QAM) transmitter solutions, only one electrode is required to adjust the relative phase offset among embedded sub-Mach-Zehnder modulators in the proposed IQ superstructure. By feeding different RF driving electronics and operating the integrated modulator as different bias conditions, different advanced multilevel modulation formats, such as QAM and 8-ary phase-shift keying (8-PSK), could be synthesized. In this paper, a 40-Gb/s 16-QAM and a 30-Gb/s 8-PSK are generated using the proposed multilevel transmitter, respectively. Offline digital processing is employed for bit-error rates estimation and constellation reconstruction.

© 2011 OSA

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References

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  1. P. J. Winzer, A. H. Gnauck, C. R. Doerr, M. Magarini, and L. L. Buhl, “Spectrally Efficient Long-Haul Optical Networking Using 112-Gb/s Polarization-Multiplexed 16-QAM,” J. Lightwave Technol. 28(4), 547–556 (2010), http://www.opticsinfobase.org/abstract.cfm?URI=JLT-28-4-547 .
    [CrossRef]
  2. M. Nakazawa, M. Yoshida, K. Kasai, and J. Hongou, “20 Msymbol/s, 64 and 128 QAM coherent optical transmission over 525km using heterodyne detection with frequency-stabilised laser,” Electron. Lett. 42(12), 710–712 (2006).
    [CrossRef]
  3. X. Zhou and J. Yu, “200-Gb/s PDM-16QAM generation using a new synthesizing method,” in Proc. European conference and exhibition on optical communication (ECOC), 2009, paper 10.3.5.
  4. T. Sakamoto, A. Chiba, and T. Kawanishi, “50-Gb/s 16-QAM by a quad-parallel Mach-Zehnder modulator,” in Proc. European conference and exhibition on optical communication (ECOC), 2007, paper PDP2.8.
  5. H. Yamazaki, T. Yamada, T. Goh, Y. Sakamaki, and A. Kaneko, “64QAM modulator with a hybrid configuration of silica PLCs and LiNbO3 phase modulators for 100-Gb/s applications,” in Proc. European conference and exhibition on optical communication (ECOC), 2009, paper 2.2.1.
  6. G.-W. Lu, T. Sakamoto, A. Chiba, T. Kawanishi, T. Miyazaki, K. Higuma, M. Sudo, and J. Ichikawa, “16-QAM Transmitter using Monolithically Integrated Quad Mach-Zehnder IQ Modulator”, in Proc. European conference and exhibition on optical communication (ECOC), 2010, Paper Mo.1.F.3.
  7. N. Kikuchi, K. Mandai, and S. Sasaki, “Experimental Demonstration of Incoherent Optical Multilevel Staggered-APSK (Amplitude- and Phase-Shift Keying) Signaling,” in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest (CD) (Optical Society of America, 2008), paper OMI3. http://www.opticsinfobase.org/abstract.cfm?URI=OFC-2008-OMI3
  8. 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) (Optical Society of America, 2009), paper OTuG4. http://www.opticsinfobase.org/abstract.cfm?URI=OFC-2009-OTuG4

2010 (1)

2006 (1)

M. Nakazawa, M. Yoshida, K. Kasai, and J. Hongou, “20 Msymbol/s, 64 and 128 QAM coherent optical transmission over 525km using heterodyne detection with frequency-stabilised laser,” Electron. Lett. 42(12), 710–712 (2006).
[CrossRef]

Buhl, L. L.

Doerr, C. R.

Gnauck, A. H.

Hongou, J.

M. Nakazawa, M. Yoshida, K. Kasai, and J. Hongou, “20 Msymbol/s, 64 and 128 QAM coherent optical transmission over 525km using heterodyne detection with frequency-stabilised laser,” Electron. Lett. 42(12), 710–712 (2006).
[CrossRef]

Kasai, K.

M. Nakazawa, M. Yoshida, K. Kasai, and J. Hongou, “20 Msymbol/s, 64 and 128 QAM coherent optical transmission over 525km using heterodyne detection with frequency-stabilised laser,” Electron. Lett. 42(12), 710–712 (2006).
[CrossRef]

Magarini, M.

Nakazawa, M.

M. Nakazawa, M. Yoshida, K. Kasai, and J. Hongou, “20 Msymbol/s, 64 and 128 QAM coherent optical transmission over 525km using heterodyne detection with frequency-stabilised laser,” Electron. Lett. 42(12), 710–712 (2006).
[CrossRef]

Winzer, P. J.

Yoshida, M.

M. Nakazawa, M. Yoshida, K. Kasai, and J. Hongou, “20 Msymbol/s, 64 and 128 QAM coherent optical transmission over 525km using heterodyne detection with frequency-stabilised laser,” Electron. Lett. 42(12), 710–712 (2006).
[CrossRef]

Electron. Lett. (1)

M. Nakazawa, M. Yoshida, K. Kasai, and J. Hongou, “20 Msymbol/s, 64 and 128 QAM coherent optical transmission over 525km using heterodyne detection with frequency-stabilised laser,” Electron. Lett. 42(12), 710–712 (2006).
[CrossRef]

J. Lightwave Technol. (1)

Other (6)

X. Zhou and J. Yu, “200-Gb/s PDM-16QAM generation using a new synthesizing method,” in Proc. European conference and exhibition on optical communication (ECOC), 2009, paper 10.3.5.

T. Sakamoto, A. Chiba, and T. Kawanishi, “50-Gb/s 16-QAM by a quad-parallel Mach-Zehnder modulator,” in Proc. European conference and exhibition on optical communication (ECOC), 2007, paper PDP2.8.

H. Yamazaki, T. Yamada, T. Goh, Y. Sakamaki, and A. Kaneko, “64QAM modulator with a hybrid configuration of silica PLCs and LiNbO3 phase modulators for 100-Gb/s applications,” in Proc. European conference and exhibition on optical communication (ECOC), 2009, paper 2.2.1.

G.-W. Lu, T. Sakamoto, A. Chiba, T. Kawanishi, T. Miyazaki, K. Higuma, M. Sudo, and J. Ichikawa, “16-QAM Transmitter using Monolithically Integrated Quad Mach-Zehnder IQ Modulator”, in Proc. European conference and exhibition on optical communication (ECOC), 2010, Paper Mo.1.F.3.

N. Kikuchi, K. Mandai, and S. Sasaki, “Experimental Demonstration of Incoherent Optical Multilevel Staggered-APSK (Amplitude- and Phase-Shift Keying) Signaling,” in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest (CD) (Optical Society of America, 2008), paper OMI3. http://www.opticsinfobase.org/abstract.cfm?URI=OFC-2008-OMI3

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) (Optical Society of America, 2009), paper OTuG4. http://www.opticsinfobase.org/abstract.cfm?URI=OFC-2009-OTuG4

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Figures (7)

Fig. 1
Fig. 1

Operation principle of the proposed multilevel transmitter for 16-QAM generation.

Fig. 2
Fig. 2

Experimental setup for 16-QAM generation.

Fig. 3
Fig. 3

Recovered constellations for (a) (b) 4-ASK and (c) 16-QAM at OSNR of around 24 dB.

Fig. 4
Fig. 4

Recovered constellations for (a) off-set 4-QAM and (b) QPSK at OSNR of around 20 dB.

Fig. 5
Fig. 5

Calculated BER of the generated 40-Gb/s 16-QAM. Inset: measured optical spectrum (resolution: 0.01 nm).

Fig. 6
Fig. 6

(a) The configuration and (b) operation principle for 8-PSK generation using the QMZ-IQ modulator.

Fig. 7
Fig. 7

Recovered 8-PSK constellation at OSNR of around 22 dB.

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