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All-optical NRZ wavelength conversion using a Sagnac loop with optimized SOA characteristics

Xiyan Jiang, Jin Wang, Chen Gao, Ji Xu and Hongdan Wan

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 Corresponding author: Jin Wang, E-mail: jinwang@njupt.edu.cn

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Abstract: We investigated the all-optical wavelength conversion technique for non-return-to-zero (NRZ) signals based on a Sagnac loop interferometer using an SOA. For the wavelength conversion of the NRZ signal at and above 40 Gbit/s, we used an in-house numerical SOA model to analyze the influence of the SOA carrier characteristics and the SOA length on the performance of the Sagnac loop. We found that the SOA carrier recovery time should be between 2 and 3 times of one bit duration in order to get optimum NRZ wavelength conversion. In addition to the carrier recovery time requirement, SOAs with a shorter physical length are preferred to be used in the Sagnac interferometer.

Key words: semiconductor optical amplifierwavelength conversionnon-return-to-zero signalcross-gain modulationcross-phase modulation



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Fig. 1.  Wavelength conversion scheme using a Sagnac loop based on SOA.

Fig. 2.  Wavelength conversion from (a) an input signal to (c) output signals through a Sagnac loop with a selected SOA2. (b) The phase difference of two counter-propagating signals after the SOA2.

Fig. 3.  (a) Schematic pump-probe experiment setup. (b) Phase recovery dynamics of three prepared SOAs. (c) Gain spectra. (d) Gain saturation characteristic.

Fig. 4.  Wavelength converted signals after a Sagnac loop with (a) a "slow" SOA1 and (b) a "fast" SOA3.

Fig. 5.  Characteristic of SOAs with a length of 0.6 mm, 1 mm and 2 mm. (a) Phase recovery dynamics of three prepared SOAs. (b) Gain spectra. (c) Gain saturation characteristic.

Fig. 6.  Wavelength converted signals through the Sagnac loop with an SOA having a length of (a) 0.6 mm or (b) 2 mm.

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Table 1.   Correspondence value of MCy and yield.

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    Received: 03 June 2014 Revised: Online: Published: 01 January 2015

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      Xiyan Jiang, Jin Wang, Chen Gao, Ji Xu, Hongdan Wan. All-optical NRZ wavelength conversion using a Sagnac loop with optimized SOA characteristics[J]. Journal of Semiconductors, 2015, 36(1): 014013. doi: 10.1088/1674-4926/36/1/014013 X Y Jiang, J Wang, C Gao, J Xu, H D Wan. All-optical NRZ wavelength conversion using a Sagnac loop with optimized SOA characteristics[J]. J. Semicond., 2015, 36(1): 014013. doi: 10.1088/1674-4926/36/1/014013.Export: BibTex EndNote
      Citation:
      Xiyan Jiang, Jin Wang, Chen Gao, Ji Xu, Hongdan Wan. All-optical NRZ wavelength conversion using a Sagnac loop with optimized SOA characteristics[J]. Journal of Semiconductors, 2015, 36(1): 014013. doi: 10.1088/1674-4926/36/1/014013

      X Y Jiang, J Wang, C Gao, J Xu, H D Wan. All-optical NRZ wavelength conversion using a Sagnac loop with optimized SOA characteristics[J]. J. Semicond., 2015, 36(1): 014013. doi: 10.1088/1674-4926/36/1/014013.
      Export: BibTex EndNote

      All-optical NRZ wavelength conversion using a Sagnac loop with optimized SOA characteristics

      doi: 10.1088/1674-4926/36/1/014013
      Funds:

      Project supported by the Scientific Research Foundation of Nanjing University of Posts and Telecommunications (Nos. NY212008, 213116) and the National Science Foundation of Jiangsu Province (No. BK20131383).

      More Information
      • Corresponding author: E-mail: jinwang@njupt.edu.cn
      • Received Date: 2014-06-03
      • Accepted Date: 2014-08-03
      • Published Date: 2015-01-25

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