科研之友
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摘要
We propose and experimentally demonstrate a novel loading scheme to improve the maximum system power budget for orthogonal frequency division multiplexing access-passive optical network (OFDMA-PON). For the downstream traffic, optical network units (ONUs) with asymmetric distribution fiber lengths are paired together, and information for the paired ONUs is loaded into the same OFDM signal by forward error correction loading combined with bit and power loading scheme. Power budgets of ONUs with long distribution fiber lengths can be improved at the cost of the power budget degradation of ONUs with short distribution fiber lengths, while maintaining the data rates for both ONUs. Besides, the total number of subcarriers used in downstream OFDM signal remains unchanged. A proof-of-concept experiment is performed to demonstrate the feasibility of the proposed scheme. A maximum of 80 km transmission and a 1:128 split ratio is achieved by the scheme, which improves the maximum system power budget by similar to 4 dB than traditional methods.
