研究目的
To support energy-efficient and low-cost 200/400-Gb/s optical interconnections and intra-datacenter networks.
研究成果
A compact, SDM-scalable, MCF-pluggable, and power-efficient 4-channel SDM transmitter based on DMT and a 1.3-μm membrane DML-array-on-Si has been demonstrated over 425-m MCF. By simultaneously driving all four lasers, pre(post)-FEC rates of 200-Gb/s (194-Gb/s) and 400-Gb/s (320-Gb/s) have been achieved considering KP4-FEC and SD-FEC respectively, together with a power reduction of six times compared with conventional DMLs. The numerical simulations predicted the feasibility of the system for MCF links up to 10-km long, even with moderate XT levels.
研究不足
The maximum transmission distance for the applications considered here is 2~10-km, and the total inter-core skew and the skew × modulation bandwidth product could still be small, thus, the SNR could still vary in time. Also, the measurements were performed using only 425-m MCF, because that was the maximum available fiber length at the time of the experiment.
The experimental setup involved generating DMT signals using up to 256 subcarriers, carrying 470 payload quadrature-amplitude modulated (QAM) symbols and 6 training symbols each. The signals were loaded onto a 25-GHz bandwidth, 4-channel AWG at 56 GSa/s without any pre-emphasis or pre-equalization. The lasers were driven simultaneously by four different bias-tees and a four-channel probe with a bandwidth of 40 GHz. The optical output powers from the FO were ?1 to ?3 dBm at a bias current of 13 mA, while the lasing wavelength was ~1.315 μm at the same current. The side-mode suppression ratio exceeded 40 dB for all four channels. The wavelength variations appearing between channels were attributed to unpredictable fabrication errors. The loss of each FI/FO connection was less than 1 dB per channel, and the optical XT was measured to be well below ?40 dB using an optical spectrum analyzer. After the 425-m MCF transmission, the XT remained below ?40 dB and the received optical powers (ROPs) were around ?1 to ?4 dBm.
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