200G Transceivers

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.

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