All-optical four-wavelength 2R regeneration based on data-pump four-wave-mixing with offset filtering |
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| Affiliation: | 1. Department of Photoelectric Information and Engineering, Foshan University, Foshan 528000, China;2. Department of Physics, Foshan University, Foshan 528000, China;1. College of Computer Science, Chongqing University, Chongqing 400044, PR China;2. School of Electronic and Information Engineering, Southwest University, Chongqing 400715, PR China;1. Dept. of Computer and Communication, Kun Shan University, No. 949, Da-Wan Rd., Yung-Kang Dist., Tainan 710, Taiwan;2. Dept. of Photonics, National Sun Yat-Sen University, No. 70, Lienhai Rd., Kaohsiung 80424, Taiwan |
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| Abstract: | A simultaneous all-optical 2R regeneration of 4 × 12.5 Gb/s return-to-zero (RZ) signals is demonstrated based on the data-pump four-wave-mixing in a single highly nonlinear fiber, in which the channel spacing and duty cycle are 200 GHz and 50%. Both the bidirectional configuration and time-interleaved technology are used to reduce the crosstalk from other channels. For further improving the performance of the multichannel regenerator, an offset filtering (OF) method is employed to minimize the influence from the opposite input signal. Our experiments show that the extinction ratio (ER) of regenerated signals is about two times larger than that of the degraded signals and the maximum ER improvement is about 6.5 dB. By using the offset filtering method, the sensitivity improvements of four-wavelength regenerated signals are 2.05 dB, 2.53 dB, 3.57 dB and 2.8 dB, respectively. |
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| Keywords: | All-optical multi-wavelength regeneration Highly nonlinear fiber Nonlinear optical signal processing |
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