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An all-optical multilevel amplitude regenerator is optimized based on the transmission response of a nonlinear optical loop mirror (NOLM). Three regenerative regions defined by the power-transfer-function (PTF) slope of less than 1 are obtained, and noise suppression is shown for a PAM4 signal. Using amplitude dithering we were able to experimentally characterize the transfer function slope and confirm...
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.
A digital free-space optical (FSO) communication over 1km based on double-channel dense wavelength division multiplexing (DWDM) is experimentally demonstrated. We successfully achieve multiplexing and demultiplexing of signals with different rates and different code types.
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)...
We demonstrate a silicon PAM-4 optical modulator, which is based on a symmetric Mach-Zehnder interferometer. Two uncorrelated binary electrical signals with different peak-to-peak voltages are applied to the phase shifters of the silicon optical modulator. Accordingly, two different phase shifts are generated in the two arms. After the permutation, there are totally four phase differences between...
In this paper, we develop two joint routing and resource allocation algorithms for stealth and ordinary services in optical networks. The transmission of stealth service needs to be hidden in ordinary services to achieve a better performance in privacy. Two heuristic algorithms construct paths for stealth and ordinary services base on the different routing methods. The proposed algorithms improve...
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