200G QSFP28-DD
200G QSFP28-DD includes two solutions.
One is the 2X 100G solution, which uses the 8x25G optical channel. For example, the 2X 100G SR4 realizes short distance 100M transmission through the MPO-16 optical jumper interface. 2X100G CWDM4, 2X100G 4WDM-10, 2KM, 10KM transmission is realized through the 2X CS new dense connector interface. This 2X100G QSFP28-DD optical module can realize compatibility with the traditional 100G QSFP28 transmission of the data center switch. QSFP-DD 2x100G has an 8x25G optical channel operating in NRZ encoding. They comply with QSFP-DD MSA.
We also provide QSFP28-DD LR4 10km and ER4 40km solution that converts 4x 50G LWDM4 PAM4 optical signals into 8-way NRZ electrical signals.
The module converts eight channels of 25Gb/s (NRZ) electrical input data to four channels of LAN-WDM optical signals and multiplexes them into a single channel for 200Gb/s (PMA4) optical transmission. On the upper side of the receiver, the module optically demultiplexes the 200Gb/s (PMA4) optical input into four channel WDM optical signals and converts them into eight 25Gb/s (NRZ) electrical output data.
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The 200G optical Transceivers has two packages: QSFP-DD and QSFP56. The first half of QSFP-DD and QSFP56 are the same. They are both QSFP, and their sizes belong to QSFP (Quad Small Form factor Pluggable) packaging mode.
Modulation method – QSFP-DD is 8 × 25G NRZ modulation for 200G transmission, QSFP56 for 4 × 50G PAM4 modulation can realize 200G transmission. Using 200G QSFP56 optical Transceivers can save the cost of optical fiber.
Low power consumption and low latency – Compared with NRZ, PAM4 has more complex modulation, higher power consumption, and is more sensitive to noise, requiring the addition of FEC forward error correction mechanism. Therefore, QSFP-DD has the characteristics of low power consumption and low latency. 200G QSFP-DD optical Transceivers can be selected in some special application scenarios with strict requirements for delay.