The 100G QSFP28 single-wavelength series is compliant with the 100G Single Lambda MSA standard and adopts the standard QSFP28 package. The modules realizes a single fiber bi-directional full-duplex transmission link.  The electrical interface complies with IEEE 802.3BM CAUI-4 standard and adopts 4*25G NRZ encoded signals, which is fully compatible with the electrical interface side of the existing 100G QSFP28 dual-fiber solution.  PAM4 encoded signal with 53.125G baud rate (bit rate: 106.25GB /s) on the optical interface is mainly used in 100G Ethernet, 100G OTU4 and metro networks.