Comparison of 100G QSFP28 SR4 optical module and 100G QSFP28 Active Fiber Optic Cable AOC


Published:

2021-10-27

Both 100G QSFP28 SR4 optical module and 100G QSFP28 active fiber optic cable AOC are widely used for short distance interconnection of 100G data centers. If both can be connected over short distances, what are the differences between them, and what are the advantages and disadvantages of each?

Comparison of 100G QSFP28 SR4 optical module and 100G QSFP28 Active Fiber Optic Cable AOC

Both 100G QSFP28 SR4 optical module and 100G QSFP28 active fiber optic cable AOC are widely used for short distance interconnection of 100G data centers. If both can be connected over short distances, what are the differences between them, and what are the advantages and disadvantages of each?

First, let's understand the commonalities before we can understand the differences. Both use a 4-channel 850nm VCSEL laser array and a PIN photodetector array, both conforming to the QSFP28 MSA and IEEE 802.3bm 100GBASE-SR4 standards. As for the differences, let C-FLINK tell you the answer.

(1) Different structure. The 100G QSFP28 Active Fiber Optic Cable AOC consists of 2 fiber transceivers and 1 fiber jumper, while the 100G QSFP28 SR4 fiber module is just a simple module that requires additional OM3/OM4 jumpers.

(2) Different sensitivity. The 100G QSFP28 SR4 optical module has DDM digital diagnostic monitoring function, while the 100G AOC active cable does not have DDM digital diagnostic monitoring function. Therefore, SR4 seems to be superior to AOC in terms of receiving sensitivity.

(3) different use costs. The 100G QSFP28 SR4 optical module and jumper price will be more expensive than the 100G QSFP28 active cable AOC. Different power consumption. The power consumption of the 100G QSFP28 SR4 optical module is higher than that of the 100G AOC active cable.

(IV)100G QSFP28 SR4 optical module and 100G QSFP28 Active cable AOC is mainly used in data centers, high performance computing and storage area networks, compatible with a variety of major brands of servers, switches, etc. However, the 100G QSFP28 SR4 fiber module is expensive and has good performance, which is suitable for the interconnection between servers and access layer switches, while the 100G AOC active fiber cable is relatively cheap and suitable for the interconnection between servers.

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Data center Solutions:

* Multi-mode optical cable connection between switches: 5-100 m, 100GbE optical cable connection between switches using multi-mode optical fiber has two options. One is to use the QSFP28 AOC active cable that is best suited for 3-20 meters. Another option is to use the QSFP28 SR4 optical module and 12-core MTP OM3/OM4 optical jumpers.

* Wiring inside the frame: 1 to 5 meters, QSFP28 passive DAC high speed copper cable, suitable for use within 5 meters. QSFP28 DAC is an ideal solution to replace 100G optical modules for short-distance connections. QSFP28 DAC passive high speed copper cables are ideal for deploying 100GbE networks to a 5m rack.