PMID- 32797006 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20200817 IS - 1539-4794 (Electronic) IS - 0146-9592 (Linking) VI - 45 IP - 16 DP - 2020 Aug 15 TI - PAM-4 transmission up to 160 Gb/s with surface-normal electro-absorption modulators. PG - 4484-4487 LID - 10.1364/OL.399280 [doi] AB - We report multi-level modulation in polarization-independent surface-normal electro-absorption modulators (SNEAMs). Four-level pulse amplitude modulation (PAM-4) at a line rate of 44 Gb/s is demonstrated on a fully packaged SNEAM with a 30 microm active area diameter and a 14 GHz electro-optic bandwidth. High-capacity PAM-4 transmission at 112 and 160 Gb/s is demonstrated on an unpackaged SNEAM chip, with a 15 microm active area diameter and ultrawide electro-optic bandwidth (>>65GHz). Fiber transmission is investigated for direct detection link lengths up to 23 km at 44 Gb/s and 2 km at 112 and 160 Gb/s, the highest multi-level modulation rates achieved on a SNEAM. FAU - Iannone, Patrick AU - Iannone P FAU - Chen, Xi AU - Chen X FAU - Grillanda, Stefano AU - Grillanda S FAU - Raybon, Gregory AU - Raybon G FAU - Burrows, Ellsworth AU - Burrows E FAU - Adamiecki, Andrew AU - Adamiecki A FAU - Hu, Ting-Chen AU - Hu TC FAU - Neilson, David T AU - Neilson DT FAU - Basavanhally, Nagesh AU - Basavanhally N FAU - Low, Yee AU - Low Y FAU - Kopf, Rose AU - Kopf R FAU - Tate, Alaric AU - Tate A FAU - Earnshaw, Mark AU - Earnshaw M LA - eng PT - Journal Article PL - United States TA - Opt Lett JT - Optics letters JID - 7708433 SB - IM EDAT- 2020/08/17 06:00 MHDA- 2020/08/17 06:01 CRDT- 2020/08/16 06:00 PHST- 2020/08/16 06:00 [entrez] PHST- 2020/08/17 06:00 [pubmed] PHST- 2020/08/17 06:01 [medline] AID - 434291 [pii] AID - 10.1364/OL.399280 [doi] PST - ppublish SO - Opt Lett. 2020 Aug 15;45(16):4484-4487. doi: 10.1364/OL.399280.