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Transmission and full-band coherent detection of polarization-multiplexed all-optical Nyquist signals generated by Sinc-shaped Nyquist pulses.

Zhang J, Yu J, Chi N - Sci Rep (2015)

Bottom Line: All optical method is considered as a promising technique for high symbol rate Nyquist signal generation, which has attracted a lot of research interests for high spectral-efficiency and high-capacity optical communication system.In this paper, we extend our previous work and report the fully experimental demonstration of polarization-division multiplexed (PDM) all-optical Nyquist signal generation based on Sinc-shaped Nyquist pulse with advanced modulation formats, fiber-transmission and single-receiver full-band coherent detection.Using this scheme, we have successfully demonstrated the generation, fiber transmission and single-receiver full-band coherent detection of all-optical Nyquist PDM-QPSK and PDM-16QAM signals up to 125-GBaud. 1-Tb/s single-carrier PDM-16QAM signal generation and full-band coherent detection is realized, which shows the advantage and feasibility of the single-carrier all-optical Nyquist signals.

View Article: PubMed Central - PubMed

Affiliation: Department of Communication Science and Engineering, and Key Laboratory for Information Science of Electromagnetic Waves (MoE), Fudan University, 220 Handan Road, Shanghai 200433, China.

ABSTRACT
All optical method is considered as a promising technique for high symbol rate Nyquist signal generation, which has attracted a lot of research interests for high spectral-efficiency and high-capacity optical communication system. In this paper, we extend our previous work and report the fully experimental demonstration of polarization-division multiplexed (PDM) all-optical Nyquist signal generation based on Sinc-shaped Nyquist pulse with advanced modulation formats, fiber-transmission and single-receiver full-band coherent detection. Using this scheme, we have successfully demonstrated the generation, fiber transmission and single-receiver full-band coherent detection of all-optical Nyquist PDM-QPSK and PDM-16QAM signals up to 125-GBaud. 1-Tb/s single-carrier PDM-16QAM signal generation and full-band coherent detection is realized, which shows the advantage and feasibility of the single-carrier all-optical Nyquist signals.

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Related in: MedlinePlus

The OSNR penalty at BER of 1 × 10−3 as a function of pulse power difference.(a) 125-GBaud PDM-QPSK and (b) 125-Gbaud PDM-16QAM signals are tested under the three different power difference cases in Fig. 11.
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f14: The OSNR penalty at BER of 1 × 10−3 as a function of pulse power difference.(a) 125-GBaud PDM-QPSK and (b) 125-Gbaud PDM-16QAM signals are tested under the three different power difference cases in Fig. 11.

Mentions: Under these three cases, two different modulation formats are simulated and tested here, including the 125-GBaud all-optical Nyquist PDM-QPSK and PDM-16QAM signals. Again, both simulated signals are generated based on the proposed schemes, using the 5 × 25-GHz combs. The OSNR penalty at BER of 1 × 10−3 as a function of power differences for 125-GBaud PDM-QPSK and PDM-16QAM signals under the three power-difference cases in Fig. 13 are shown in Fig. 14(a,b), respectively. We can observe that the OSNR penalty increases with the addition of power difference, as shown in both Fig. 14(a,b). We believe that the penalty is due to the error fluctuations in the convergence process of the taps of adaptive equalizers under power imbalance cases. On the other hand, the opposite power difference case shows larger OSNR penalty compared with the other two cases. This is because the opposite power differences produce doubled power imbalance overall. Finally, we can see that higher level symbol-format (PDM-16QAM) is much more sensitive to the power difference compared with lower symbol-rate signal. It is because that multi-level or multi-modulus equalization is used for higher level modulation formats, the average power differences between each symbol causes larger decision error, which have much larger impact on the taps convergence. Experiment results in Figs 8 and 5 also confirm this conclusion.


Transmission and full-band coherent detection of polarization-multiplexed all-optical Nyquist signals generated by Sinc-shaped Nyquist pulses.

Zhang J, Yu J, Chi N - Sci Rep (2015)

The OSNR penalty at BER of 1 × 10−3 as a function of pulse power difference.(a) 125-GBaud PDM-QPSK and (b) 125-Gbaud PDM-16QAM signals are tested under the three different power difference cases in Fig. 11.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4555172&req=5

f14: The OSNR penalty at BER of 1 × 10−3 as a function of pulse power difference.(a) 125-GBaud PDM-QPSK and (b) 125-Gbaud PDM-16QAM signals are tested under the three different power difference cases in Fig. 11.
Mentions: Under these three cases, two different modulation formats are simulated and tested here, including the 125-GBaud all-optical Nyquist PDM-QPSK and PDM-16QAM signals. Again, both simulated signals are generated based on the proposed schemes, using the 5 × 25-GHz combs. The OSNR penalty at BER of 1 × 10−3 as a function of power differences for 125-GBaud PDM-QPSK and PDM-16QAM signals under the three power-difference cases in Fig. 13 are shown in Fig. 14(a,b), respectively. We can observe that the OSNR penalty increases with the addition of power difference, as shown in both Fig. 14(a,b). We believe that the penalty is due to the error fluctuations in the convergence process of the taps of adaptive equalizers under power imbalance cases. On the other hand, the opposite power difference case shows larger OSNR penalty compared with the other two cases. This is because the opposite power differences produce doubled power imbalance overall. Finally, we can see that higher level symbol-format (PDM-16QAM) is much more sensitive to the power difference compared with lower symbol-rate signal. It is because that multi-level or multi-modulus equalization is used for higher level modulation formats, the average power differences between each symbol causes larger decision error, which have much larger impact on the taps convergence. Experiment results in Figs 8 and 5 also confirm this conclusion.

Bottom Line: All optical method is considered as a promising technique for high symbol rate Nyquist signal generation, which has attracted a lot of research interests for high spectral-efficiency and high-capacity optical communication system.In this paper, we extend our previous work and report the fully experimental demonstration of polarization-division multiplexed (PDM) all-optical Nyquist signal generation based on Sinc-shaped Nyquist pulse with advanced modulation formats, fiber-transmission and single-receiver full-band coherent detection.Using this scheme, we have successfully demonstrated the generation, fiber transmission and single-receiver full-band coherent detection of all-optical Nyquist PDM-QPSK and PDM-16QAM signals up to 125-GBaud. 1-Tb/s single-carrier PDM-16QAM signal generation and full-band coherent detection is realized, which shows the advantage and feasibility of the single-carrier all-optical Nyquist signals.

View Article: PubMed Central - PubMed

Affiliation: Department of Communication Science and Engineering, and Key Laboratory for Information Science of Electromagnetic Waves (MoE), Fudan University, 220 Handan Road, Shanghai 200433, China.

ABSTRACT
All optical method is considered as a promising technique for high symbol rate Nyquist signal generation, which has attracted a lot of research interests for high spectral-efficiency and high-capacity optical communication system. In this paper, we extend our previous work and report the fully experimental demonstration of polarization-division multiplexed (PDM) all-optical Nyquist signal generation based on Sinc-shaped Nyquist pulse with advanced modulation formats, fiber-transmission and single-receiver full-band coherent detection. Using this scheme, we have successfully demonstrated the generation, fiber transmission and single-receiver full-band coherent detection of all-optical Nyquist PDM-QPSK and PDM-16QAM signals up to 125-GBaud. 1-Tb/s single-carrier PDM-16QAM signal generation and full-band coherent detection is realized, which shows the advantage and feasibility of the single-carrier all-optical Nyquist signals.

No MeSH data available.


Related in: MedlinePlus