Abstract

Through four-wave mixing (FWM) process in highly-nonlinear fiber (HNLF) or semiconductor device, the phase-modulation depth of one converted FWM component could be doubled compared with that of the original input signal. Therefore, with a multilevel phase-modulated signal and a CW light as inputs, after FWM process in a nonlinear media, phase pattern (0, π) carried in the input multilevel phase-modulated signal will not be transferred to one converted FWM component, which could be referred to as an optical phase erasure process. We experimentally demonstrated format conversion from 320-Gb/s return-to-zero differential quadrature phase-shift keying (RZ-DQPSK) to 160-Gb/s return-to-zero differential phase-shift keying (RZ-DPSK) through the proposed all-optical phase erasure scheme. The phase information carried in the converted binary RZ-DPSK is logically equal to the input Q-component, or a logical XOR operation result between I and Q components of the input RZ-DQPSK, which correspond to a serial or parallel DQPSK transmitter for the input RZ-DQPSK signal. It can be applied to erase a binary tributary from a multilevel modulation format.

© 2009 Optical Society of America

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References

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  1. M. Galili, B. Huettl, C. Schmidt-Langhorst, R. Ludwig, F. Futami, S. Watanabe, and C. Schubert, " All-Optical Combination of DPSK and OOK to 160 Gbit/s DQPSK Data Signals," in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest Series (CD) (Optical Society of America, 2007), paper OThI5, http://www.opticsinfobase.org/abstract.cfm?URI=OFC-2007-OThI5.
    [CrossRef] [PubMed]
  2. K. Mishina, S. M. Nissanka, A. Maruta, S. Mitani, K. Ishida, K. Shimizu, T. Hatta, and K. Kitayama, "All-optical modulation format conversion from NRZ-OOK to RZ-QPSK using parallel SOA-MZI OOK/BPSK converters," Opt. Express 15, 7774-7785 (2007), http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-12-7774.
    [CrossRef] [PubMed]
  3. K. Mishina, A. Maruta, S. Mitani, T. Miyahara, K. Ishida, K. Shimizu, T. Hatta, K. Motoshima, and K. Kitayama, "NRZ-OOK-to-RZ-BPSK Modulation-Format Conversion Using SOA-MZI Wavelength Converter," J. Lightwave Technol. 24, 3751-3758 (2006), http://www.opticsinfobase.org/JLT/abstract.cfm?URI=JLT-24-10-3751.
    [CrossRef]
  4. G.-W. Lu, K.S. Abedin, and T. Miyazaki, "All-optical RZ-DPSK WDM to RZ-DQPSK phase multiplexing using four-wave mixing in highly nonlinear fiber," IEEE Photon. Technol. Lett. 19, 1699-1701, (2007).
    [CrossRef]
  5. G.-W. Lu, and T. Miyazaki, "Optical phase add/drop for format conversion between DQPSK and DPSK and its application in optical label switching systems," IEEE Photon. Technol. Lett. 21, 322-324, (2009).
    [CrossRef]
  6. T. Kawanishi, T. Sakamoto, T. Miyazaki, M. Izutsu, T. Fujita, S. Mori, K. Higuma, and J. Ichikawa, "High-speed optical DQPSK and FSK modulation using integrated Mach-Zehnder interferometers," Opt. Express 14, 4469-4478 (2006), http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-10-4469.
    [CrossRef] [PubMed]
  7. C. Wree, J. Leibrich, D. Mohr, J. Eick, and W. Rosenkranz, "Experimental Investigation of Receiver Sensitivity of RZ-DQPSK Modulation Format Using Balanced Detection," in Optical Fiber Communication Conference, Technical Digest (Optical Society of America, 2003), paper ThE5. http://www.opticsinfobase.org/abstract.cfm?URI=OFC-2003-ThE5.

2009 (1)

G.-W. Lu, and T. Miyazaki, "Optical phase add/drop for format conversion between DQPSK and DPSK and its application in optical label switching systems," IEEE Photon. Technol. Lett. 21, 322-324, (2009).
[CrossRef]

2007 (2)

2006 (2)

Abedin, K.S.

G.-W. Lu, K.S. Abedin, and T. Miyazaki, "All-optical RZ-DPSK WDM to RZ-DQPSK phase multiplexing using four-wave mixing in highly nonlinear fiber," IEEE Photon. Technol. Lett. 19, 1699-1701, (2007).
[CrossRef]

Fujita, T.

Hatta, T.

Higuma, K.

Ichikawa, J.

Ishida, K.

Izutsu, M.

Kawanishi, T.

Kitayama, K.

Lu, G.-W.

G.-W. Lu, and T. Miyazaki, "Optical phase add/drop for format conversion between DQPSK and DPSK and its application in optical label switching systems," IEEE Photon. Technol. Lett. 21, 322-324, (2009).
[CrossRef]

G.-W. Lu, K.S. Abedin, and T. Miyazaki, "All-optical RZ-DPSK WDM to RZ-DQPSK phase multiplexing using four-wave mixing in highly nonlinear fiber," IEEE Photon. Technol. Lett. 19, 1699-1701, (2007).
[CrossRef]

Maruta, A.

Mishina, K.

Mitani, S.

Miyahara, T.

Miyazaki, T.

G.-W. Lu, and T. Miyazaki, "Optical phase add/drop for format conversion between DQPSK and DPSK and its application in optical label switching systems," IEEE Photon. Technol. Lett. 21, 322-324, (2009).
[CrossRef]

G.-W. Lu, K.S. Abedin, and T. Miyazaki, "All-optical RZ-DPSK WDM to RZ-DQPSK phase multiplexing using four-wave mixing in highly nonlinear fiber," IEEE Photon. Technol. Lett. 19, 1699-1701, (2007).
[CrossRef]

T. Kawanishi, T. Sakamoto, T. Miyazaki, M. Izutsu, T. Fujita, S. Mori, K. Higuma, and J. Ichikawa, "High-speed optical DQPSK and FSK modulation using integrated Mach-Zehnder interferometers," Opt. Express 14, 4469-4478 (2006), http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-10-4469.
[CrossRef] [PubMed]

Mori, S.

Motoshima, K.

Nissanka, S. M.

Sakamoto, T.

Shimizu, K.

IEEE Photon. Technol. Lett. (2)

G.-W. Lu, K.S. Abedin, and T. Miyazaki, "All-optical RZ-DPSK WDM to RZ-DQPSK phase multiplexing using four-wave mixing in highly nonlinear fiber," IEEE Photon. Technol. Lett. 19, 1699-1701, (2007).
[CrossRef]

G.-W. Lu, and T. Miyazaki, "Optical phase add/drop for format conversion between DQPSK and DPSK and its application in optical label switching systems," IEEE Photon. Technol. Lett. 21, 322-324, (2009).
[CrossRef]

J. Lightwave Technol. (1)

Opt. Express (2)

Other (2)

M. Galili, B. Huettl, C. Schmidt-Langhorst, R. Ludwig, F. Futami, S. Watanabe, and C. Schubert, " All-Optical Combination of DPSK and OOK to 160 Gbit/s DQPSK Data Signals," in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest Series (CD) (Optical Society of America, 2007), paper OThI5, http://www.opticsinfobase.org/abstract.cfm?URI=OFC-2007-OThI5.
[CrossRef] [PubMed]

C. Wree, J. Leibrich, D. Mohr, J. Eick, and W. Rosenkranz, "Experimental Investigation of Receiver Sensitivity of RZ-DQPSK Modulation Format Using Balanced Detection," in Optical Fiber Communication Conference, Technical Digest (Optical Society of America, 2003), paper ThE5. http://www.opticsinfobase.org/abstract.cfm?URI=OFC-2003-ThE5.

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Figures (10)

Fig. 1.
Fig. 1.

Operation principle of the proposed format conversion scheme based on optical phase erasure.

Fig. 2.
Fig. 2.

Phase patterns of (a) input DQPSK and (b) converted DPSK.

Fig. 3.
Fig. 3.

Constellation diagrams of (a) input RZ-DQPSK and (b) converted RZ-DPSK.

Fig. 4.
Fig. 4.

Experimental setup for format conversion from 320-Gb/s RZ-DQPSK to 160-Gb/s RZDPSK. (Note: the phase constellations are drawn based on the relative phase difference.)

Fig. 5.
Fig. 5.

Measured optical spectrum after HNLF.

Fig. 6.
Fig. 6.

Measured waveform before phase de-modulation (i), and de-modulated 10-Gb/s eye diagrams of RZ-DQPSK and RZ-DPSK (ii).

Fig. 7.
Fig. 7.

Eye diagrams of 16 tributaries of input RZ-DQPSK (Q component) after phase-demodulation and channel de-multiplexing (time scale: 25ps/div).

Fig. 8.
Fig. 8.

Eye diagrams of 16 tributaries of converted RZ-DPSK after phase-demodulation and channel de-multiplexing (time scale: 25 ps/div).

Fig. 9.
Fig. 9.

Measured optical spectra of the (a) input RZ-DQPSK and (b) converted RZ-DPSK signals.

Fig. 10.
Fig. 10.

Measured BER results of the input RZ-DQPSK and converted RZ-DPSK signals after de-multiplexing to 10Gb/s data: (a) BER vs. received optical power; (b) plotted sensitivities of 16 tributaries.

Tables (1)

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Table 1. Logic and Phase Mapping between Input DQPSK and Output DPSK with Different DQPSK Transmitters

Equations (1)

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E221 =kA22 A1 exp [j2ω2ω1t+(2θ2θ1)]

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