Abstract
We demonstrate DML-based net 325-Gb/s at back-to-back and 321.24-Gb/s after 2-km standard single-mode fiber transmissions for >300-Gbps/λ short-reach optical interconnects. Our net rate performance denotes an increase of ∼34% compared to our previous works, while the pre-FEC rates are >400 Gbps. The DML transmitter is based on a PPR-enhanced, >100-GHz-bandwidth DML, fabricated by our novel membrane-III-V-on-SiC technology. Also wide-band, entropy-loaded DMT modulation is utilized based on a novel adaptive algorithm and via a digitally-preprocessed analog multiplexer. These results pave the way towards low-cost and energy-efficient Terabit Ethernet and a significant step towards achieving DML-based 400-Gbps/λ IM/DD systems in the future.
Highlights
T HE surging traffic growth in data center networks imposed by the increasing video and cloud content push future standardizations, such as the Terabit Ethernet (TbE) [1], to extend the line rate requirements beyond 200-Gbps per channel with the possibility of relying on 300- or 400-Gbps/channel in the near future
By combining an adaptive algorithm for entropy loading” (EL) discrete multitone (EL-DMT) modulation with an analog multiplexer (AMUX) for driving a >100-GHz bandwidth directly-modulated lasers (DMLs)-on-SiC, we successfully demonstrated net 325-Gb/s and 321.24-Gbps at back-to-back (BTB) and after 2-km of standard single-mode fiber (SSMF) transmissions, respectively, surpassing our previous net rate by ∼34% [16]
Towards low-cost and energy-efficient TbE and singlechannel >300-Gbps intensitymodulated directly-detected (IM/DD) systems, we have demonstrated DML-based net 325-Gb/s at BTB and 321.24-Gb/s after 2-km SSMF transmission and pre-forward-error correction (FEC) rates >400 Gbps
Summary
T HE surging traffic growth in data center networks imposed by the increasing video and cloud content push future standardizations, such as the Terabit Ethernet (TbE) [1], to extend the line rate requirements beyond 200-Gbps per channel with the possibility of relying on 300- or 400-Gbps/channel in the near future. We demonstrated the first-ever DMLs capable of achieving modulation bandwidths in excess of 100 GHz [5], which allowed us to reach 256-Gbps (net ∼240-Gbps) 4-level pulse amplitude modulation (PAM-4) transmissions [5]. This unprecedented performance was owned to our novel membraneIII-V-on-SiC technology [6] and a photon-photon resonance (PPR)-supporting compound-cavity design. Pre forward-error correction (FEC) rates exceeded 400 Gbps In this extended paper, we expand on the obtained results of [16], while providing a detailed description of a novel adaptive EL technique used.
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