AscentOptics’ QSFP-DD coherent optical transeivers include 100G QSFP-DD, 100G/200G/400G compliant QSFP-DD ZR and open ZR+. They are designed based on dual polarization quadrature phase shift keying (DP-QPSK) or dual polarization quadrature amplitude modulation (DP-16QAM) or probabilistic constellation shaping quadrature amplitude modulation (PCS-16QAM), supporting extended C-band, polarization diversity coherent detection and advanced electronic link equalization. The product family supports 100/400Gbps transmission speeds in an industry-standard, pluggable QSFP-DD form factor with DSP and can be widely used in metro carrier, access, and Cloud/DCI applications.