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All-Optical Format Conversion From PAM4 to QPSK Signal based on HNLF
LI Qiankun 1,WANG Hongxiang 2 *
1.School of Information and Communicaiton Engineering, Beijing University of Posts and Telecommunications,Beijing,100876
2.School of Information and Communicaiton Engineering, Beijing University of Posts and Telecommunications,Beijing,100876;School of Information and Communication,Beijing University of Posts and Telecommunications,Beijing,100876
*Correspondence author
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Funding: none
Opened online:26 March 2019
Accepted by: none
Citation: LI Qiankun,WANG Hongxiang.All-Optical Format Conversion From PAM4 to QPSK Signal based on HNLF[OL]. [26 March 2019] http://en.paper.edu.cn/en_releasepaper/content/4747400
 
 
An optical network intermediate node scheme with format conversion of PAM4-to-QPSK signal is first proposed and simulated numerically. The input PAM4 signal is first converted into the two binary phase-shift keying(BPSK) tributaries based on optical nonlinearity and vector addition. The output quadrature phase-shift keying(QPSK) is generated through vector addition between two BPSK tributaries. One sub-channel BPSK tributary can be extracted from input PAM4 signal directly by using optical nonlinearity and vector superposition. When input PAM4 signal is pre-distorted to be the distorted PAM4 signal by self-phase modulation(SPM), another sub-channel BPSK tributary can be extracted from the distorted PAM4 signal by using optical nonlinearuty and vector superposition. For an input 10 Gb/s PAM4 with optical signal-to noise ratio(OSNR) of 30dB, the output QPSK gets 1.8% decrease in error vector amplitude(EVM), 3 dB receiver OSNR improvement at the bit error rate(BER) of 0.001 because of SPM-based amplitude regeneration. The proposed node scheme can be applied an all-optical interconnection node between different optical networks where different modulation formats are utilized individually.
Keywords:Optical Fiber Communication Technology; All Optical Format Conversion; Nonlinear Fiber Optics
 
 
 

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