Abstract
We investigate the transmission distance of a 20-Gbaud 6-mode dual-polarization QPSK transmission system using the Kramers–Kronig(KK) receiver based on the mode permutation (MP) scheme. Compared to the system without the use of MP scheme, the maximum transmission distance is increased from 460 km to 910 km and to over 1000 km via the cyclic mode permutation and the mirror-flipped mode permutation, respectively, at the KP4 forward error correction (FEC) threshold of 2.2×10−4. The required carrier signal power budget of KK receiver is also reduced. The KK receiver can detect the signal of each mode after the transmission of 1000 km with potential advantages of low cost and low power. It is shown as a competitive detection technique in medium-reach metropolitan networks.
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