Abstract
We propose a RF-pilot aided modulation format identification (MFI) technique to enable a hitless flexible coherent transceiver with fast format switching. For the MFI, modulation format information is encoded to the amplitude of the RF-pilot, which can be simultaneously used for the compensation of both laser phase noise and fiber nonlinearity. The proposed MFI technique is able to identify arbitrary modulation formats including multi-dimensional formats and hybrid QAM formats. The high accuracy of the proposed MFI scheme is experimentally demonstrated without sacrificing the tolerance of both laser phase noise and fiber nonlinearity for various modulation formats up to dual-polarization (DP) 64QAM. Finally, over 2240 km standard single mode fiber (SSMF) link, we experimentally demonstrate a hitless coherent transceiver with a fast block-by-block modulation format switching enabled by the proposed MFI.
Highlights
Due to the emergence of bandwidth-consuming services such as high-definition video streaming, cloud and 5G, optical network is evolving from a conventional fixed architecture to an agile and intelligent network [1,2,3]
We propose a RF-pilot aided modulation format identification (MFI) technique to enable a hitless flexible coherent transceiver with fast format switching
For the MFI, modulation format information is encoded to the amplitude of the RF-pilot, which can be simultaneously used for the compensation of both laser phase noise and fiber nonlinearity
Summary
Due to the emergence of bandwidth-consuming services such as high-definition video streaming, cloud and 5G, optical network is evolving from a conventional fixed architecture to an agile and intelligent network [1,2,3]. Hitless flexible transceiver has gained increasing attentions owing to its ability to adapt transceiver configurations such as bit-rate and modulation format according to instantaneous link margin without interrupting network traffic [4,5,6]. MFI can be realized in the Stokes space by identifying either the number of clusters or the higher order statistics [7,8,9,10] It can be implemented by identifying the power distributions of received signals [11,12,13]. Proposed a MFI method for Hybrid QAM by examining the statistical radius distribution of received signal It does not work for higher order hybrid QAM such as hybrid 8QAM/16QAM. Fast hitless modulation format switching between DP-8QAM, set-partitioning (SP) 128QAM and DP-16QAM enabled by the proposed MFI over a 2240 km standard single mode fiber (SSMF) link is demonstrated
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