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How to Choose the Right 100g QSFP28 Optical Transceiver?

Ⅰ. Purchase method of 100g QSFP28 optical transceiver

1. Multimode fiber cabling between switches: 5-100m

100G QSFP28 SR4 optical transceiver can be selected, which adopts MTP interface (8 cores) and has a transmission distance of 70m when used with OM3 multimode fiber.

The transmission distance when used with OM4 multimode fiber is 100m, and the 100g QSFP28 SR4 optical transceiver is suitable for short-distance transmission (distance less than 100 meters) in 100G networks.

2. Single-mode fiber cabling between switches: 100m-2km

You can choose 100G QSFP28 PSM4 optical transceiver or 100g CWDM4 QSFP28 optical transceiver, both of which are suitable for short and medium distance 100G network.

The 100g QSFP28 PSM4 optical transceiver is used together with 8 parallel single-mode fibers, and the transmission distance is about 500 meters; the 100G QSFP28 CWDM4 optical transceiver is used together with the single-mode fiber, and the transmission distance can reach 2 km.

3. Long-mode single-mode fiber: ≤10km

The 100G QSFP28 LR4 optical transceiver can be selected. It adopts a duplex LC interface. When used with single-mode fiber, the transmission distance can reach 10km.

Ⅱ. Four common types of 40G optical transceivers

1. 40GBASE-SR4 optical transceiver

It is widely used in short-distance transmission and is the most commonly used module in 40G networks. Usually used with multimode fiber patch cords with MPO/MTP interface, and the transmission distance is 100 meters when used with OM3 fiber patch cords;

The transmission distance is 150 meters when used with OM4 fiber patch cords. The 40GBASE-SR4 optical transceiver has 4 full-duplex channels, which are also transmitted through four channels. Each channel can support 10Gbps data transmission and achieve high-bandwidth 40G transmission.

2. QSFP-40G-LR4 optical transceiver

The 40G optical transceiver is the most commonly used optical transceiver in long-distance transmission. The 40GBASE-LR4 optical transceiver is equipped with a single-mode fiber patch cord with a duplex LC interface, and the maximum transmission distance can reach 10KM.

This optical transceiver has 4 independent transmitting and receiving signal channels. The optical signal at the transmitting end is combined and transmitted by all wavelengths through the multiplexer, and the transmitted signal will be decomposed into 4 channels with a transmission rate of 10Gbps by the demultiplexer at the receiving end.

3. QSFP-40G-PSM4 optical transceiver

As a highly integrated 4-channel optical transceiver, the 40GLR4PSM optical transceiver has the advantages of high port density and low cost. The working principle of the 40GLR4PSM optical transceiver is the same as that of the 40GSR4QSFP+ optical transceiver.

The difference is that the 40GLR4PSM optical transceiver realizes 40G long-distance data transmission through single-mode jumpers, that is, parallel optical signals are sent in parallel through 8 single-mode fibers. The maximum transmission distance can reach 2 kilometers.

4. QSFP-40G-ER4 optical transceiver

The last module to be introduced, 40GBASE-ER4, has the same working principle as the previous two modules LR4 and PSM4, using LC duplex interface with single-mode jumper. The maximum transmission distance can reach 40 kilometers.

40G QSFP+ optical transceiver can realize high-density, low-cost, low-power 40G data transmission, and has a good development prospect.

Before choosing the most suitable optical transceiver for your data equipment, it is very important to understand the interface types, main models and application scenarios of 40G QSFP+. We hope that the introduction of this article can help you better understand 40G QSFP+ optical transceivers.

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