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A joint timing offset (TO) and frequency offset (FO) estimation method based on Radon-Wigner transform (RWT) is first proposed for coherent optical orthogonal frequency-division multiplexing (CO-OFDM) systems. The result shows that the timing and frequency synchronization performance of the proposed method are both better than the Schmidl & Cox method and fractional Fourier transform (FrFT) algorithm...
Crosstalk noise is a potential issue for optical router used by optical network-on-chip (ONoC). The huge crosstalk directly degrades the performance in optical signal-to-noise ratio (OSNR) at optical router level, and greatly limits the scalability at ONoC level. This paper proposes ILCOR, a low-crosstalk optical router using multi-layer coupled MR. The use of multi-layer coupled MR enables less waveguide...
In this paper, the OSNR expressions for the cascaded system in the practical optical network is derived from the definition of OSNR. Then we analyse the OSNR changes in optical channels resulted from the variation of network topology, which is verified by optical network simulation software at the end of the paper.
This paper reports a 400-km ultra-long haul unrepealed transmission system in a 8×10 Gbit/s optical transmission network (OTN) by using forward Raman amplifier and backward second order remotely optical pumped amplifier(ROPA). A second order ROPA is obtained by adding an auxiliary second order pump to the first order ROPA. Through experiment, we compare the performance of 1st ROPA and 2nd ROPA in...
High spectrum efficiency and flexibility are the advantages of elastic optical network, which is the future direction of optical network development. Routing and resource allocation is one of the core technologies of flexible optical networks. This paper propose an improved RSA algorithm in the elastic optical network which based on OSNR impairment model. It considers both QoT (quality of transmission)...
A constant modulus algorithm-(CMA) based carrier frequency offset estimation method for coherent optical orthogonal frequency division multiplexing (CO-OFDM) system is proposed. Theoretical analysis and simulation results indicate that the frequency offset estimation range of the proposed algorithm can achieve [−5.9, +5.9] GHz, and the mean normalized estimation error can be kept under 0.001 even...
A PolDemux method using Extended Kalman Filter is proposed, which is general and independent on channel RSOP models for RSOP tracing, and shows great RSOP tracing speed, moderate PMD tolerances, fast convergence and lower complexity.
Analytical model is proposed to estimate EVM under the case of nonlinear noise for coherent optical fiber communications with digital receivers. Theoretical formula is obtained, which is validated by numerical simulations.
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