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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 16 — Aug. 3, 2009
  • pp: 13346–13353

Optical phase erasure based on FWM in HNLF enabling format conversion from 320-Gb/s RZ-DQPSK to 160-Gb/s RZ-DPSK

Guo-Wei Lu and Tetsuya Miyazaki  »View Author Affiliations

Optics Express, Vol. 17, Issue 16, pp. 13346-13353 (2009)

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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

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.5060) Fiber optics and optical communications : Phase modulation

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: May 19, 2009
Revised Manuscript: June 14, 2009
Manuscript Accepted: July 8, 2009
Published: July 20, 2009

Guo-Wei Lu and Tetsuya Miyazaki, "Optical phase erasure based on FWM in HNLF enabling format conversion from 320-Gb/s RZDQPSK to 160-Gb/s RZ-DPSK," Opt. Express 17, 13346-13353 (2009)

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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]
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  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]
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