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Precautions and Differences of 100G Optical Transceiver

Ⅰ. Precautions of the application of 100G optical transceiver

The introduction of the 5G network results in an increase in data traffic and rate, the demand for optical transceiver rate will rise in tandem. The 5G front transmission section will be updated from 10G to 25G, and the data center will be upgraded from 10G and 40G to 100G, resulting in a considerable increase in market demand for 100G optical transceivers in the future.

The 100G QSFP28 optical transceiver is a high-speed optical transceiver in a compact QSFP28 package for 100G Ethernet applications. Each channel has a data rate of 28 Gbps.

It is available in various transmission distances. The EDR optical transceiver for InfiniBand systems is a QSFP28 optical transceiver with higher performance requirements.


1. Application scenarios for the QSFP28 optical transceiver are as follows: The QSFP28 optical transceiver is primarily utilized in data centers for 100G connection in core switches and core routers.

2. The most prevalent types of 100G optical transceivers: 100G QSFP28 optical transceiver, CFP4 optical transceiver (100G), CFP2 optical transceiver (100G), CFP optical transceiver (100G). The QSFP28 optical transceiver is now the most popular 100G optical transceiver.

3. Working temperature range of QSFP28 optical transceiver: Working temperature range of QSFP28 optical transceiver is 0°C-70°C for normal commercial grade products.

Although most data centers use commercial-grade goods, others use products with an operating temperature range of 20°C to 50°C to save money.


Ⅱ. Distinction between 100G QSFP28 optical transceiver and 100G CFP4 optical transceiver

The 100G QSFP28 package optical transceiver is ideal for a wide range of transmission distances and application scenarios, and is a significant part of the 100G network. It is primarily utilized in 100G Ethernet and EDRInfiniBand. The majority of clients seek low power consumption, small size, port density, and other advantages, but optical components are concentrated and heat dissipation is common.

100G CFP4 optical transceiver has experience with CFP, CFP2, and now CFP4 optical transceiver, technology development is mature, and it can support hot-plugging, but it has a smaller volume than QSFP28 optical transceiver, fewer categories, and is not applicable to many application scenarios. 100G CFP4 optical transceiver heat dissipation is superior to QSFP28 optical transceiver.

Protocol standard, mechanical size, MAC-to-PHY interface, control bus interface, application scope, and so on.

The CFP MSA specifies CFP4, which is slightly larger than the QSFP28. The MDIO interface controls and monitors the interface between the MAC and the PHY, which varies depending on the application. The 100G CFP4 optical transceiver is most commonly used in access and metro networks.

The IEEE-mandated 100G QSFP28 optical transceiver is smaller than the CFP4 and one of the most integrated 100G modules on the market (CXP is more integrated). CAUI-4 is the interface between the MAC and the PHY, and an I2C interface is used for control and monitoring, which is typically found in data centers.

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