QPSK Training Sequence-Based Both OSNR and Chromatic Dispersion Monitoring in DWDM Systems

QPSK Training Sequence-Based Both OSNR and Chromatic Dispersion Monitoring in DWDM Systems

We design a quadrature phase-shift keying training sequence (QPSK-TS) for monitoring both optical signal-to-noise ratio (OSNR) and chromatic dispersion (CD) in a dense wavelength division multiplexing (DWDM) system. By applying fast Fourier transform on the QPSK-TS, a comb-like spectrum with discret...

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Bibliographic Details
Main Authors: Feilong Wu, Aiying Yang, Peng Guo, Yaojun Qiao, Lingwei Zhuang, Shaojian Guo
Format: Article
Language:English
Published: IEEE 2018-01-01
Series:IEEE Photonics Journal
Subjects:
Training sequence
fractional domain
fiber optics systems.
Online Access:https://ieeexplore.ieee.org/document/8424439/
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Summary:We design a quadrature phase-shift keying training sequence (QPSK-TS) for monitoring both optical signal-to-noise ratio (OSNR) and chromatic dispersion (CD) in a dense wavelength division multiplexing (DWDM) system. By applying fast Fourier transform on the QPSK-TS, a comb-like spectrum with discrete peaks can be obtained. OSNR can be calculated by measuring the power of the amplified spontaneous emission (ASE) noise in the gaps between these peaks. Moreover, we search the optimal order in the fractional domain to calculate the CD after applying fractional Fourier transform on the QPSK-TS signal. The proposed method shows large ASE noise and optical nonlinearity tolerance in simulation results (<inline-formula><tex-math notation="LaTeX">$&lt;$</tex-math></inline-formula>1.0 dB error within 24 dB after transmission over 1000 km with 3 dBm per channel launch power, and <inline-formula><tex-math notation="LaTeX">$&lt;$ </tex-math></inline-formula>90 ps/nm error within 33400 ps/nm). Furthermore, the experimental results demonstrate high accuracy of the proposed method (<inline-formula><tex-math notation="LaTeX">$\leq$</tex-math></inline-formula>1.0 dB error within 28 dB and <inline-formula><tex-math notation="LaTeX">$&lt;$</tex-math></inline-formula>40 ps/nm error within 1670&#x00A0;ps/nm after 100 km single channel transmission).
ISSN:1943-0655

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