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All-optical format conversion from non-return-to-zero to return-to-zero based on four-wave mixing in photonic crystal fiber

Hui Zhan-Qiang Zhang Jian-Guo

All-optical format conversion from non-return-to-zero to return-to-zero based on four-wave mixing in photonic crystal fiber

Hui Zhan-Qiang, Zhang Jian-Guo
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  • Received Date:  24 January 2011
  • Accepted Date:  24 March 2011
  • Published Online:  05 January 2012

All-optical format conversion from non-return-to-zero to return-to-zero based on four-wave mixing in photonic crystal fiber

  • 1. Xi'an Institute of Posts and Telecommunications, Xi'an 710061, China;
  • 2. State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China
Fund Project:  Project supported by the Main Direction Progvam of Knowledge Innovation of Chinese Academy of Sciences (Grant No. KGCX2 - YW - 108), and the Scientific Research Foundation of Shaanxi Education Bureau of Shaanx Province (Grant No. 11JK0901).

Abstract: The conversion from all-optical non-return-to-zero (NRZ) to return-to-zero (RZ) format is a crucial technology in interfacing WDM and OTDM of future transparent photonic network. The conversion from all-optical single-to-dual NRZ to RZ format conversion is presented and experimentally demonstrated based on four-wave mixing (FWM) in a 50 m dispersion-flattened highly-nonlinear photon crystal fiber (DF-HNL-PCF). The original NRZ format is converted into RZ format by injecting synchronized clock signal into the DF-HNL-PCF. The FWM effect generates two sideband components, which carry the same data information as the original NRZ signal with RZ format. The proposed format converter has a wide and tunable operation wavelength range of 19.3 nm. The optimum conversion efficiency, extinct ratio and Q factor are -21 dB, 11.9 dB and 7.2, respectively. The system is transparent to both bit rate and modulation format. The advantage of this scheme consists in the ability of bandwidth scalable due to the fact that the dispersion flattening of HNL - PCF is used. Furthermore, it is all optical fiber, compact and robust, which makes it more competitive as well as easily accessible for use in practical optical communication systems.

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