With the rapid development of data communication and telecommunication transmission technologies, the information capacity of optical networks has surged, and 100G optical modules with high-speed bandwidth have become mainstream products in data centers. At the same time, the 100G optical module technology is becoming more and more perfect, and the 100G optical module market competition is becoming more and more fierce. More and more module manufacturers put more energy into R&D and production. So what are the differences between 100G optical modules with different distances? Let us analyze them from the aspects of transmission mode, application scenarios, and price.

transfer method

100GE QSFP28 PSM4 adopts 4-channel parallel transmission technology, so the advantage of using MPO12 optical port is that the design is dense and the resource core is many, but the correspondingly longer distance will lead to an increase in cost. In order to solve the problem of fiber cost except for short distances, both CWDM4 and CLR4 adopt WDM (wavelength division multiplexing) technology, and use two fibers to run in opposite directions, which greatly saves costs.

Application scenarios

In this regard, the high-speed transmission optical module needs to use FEC to ensure the stability of the transmission signal, but the problem of signal delay arises. And 100GE QSFP28 CLR4 can ensure 0 signal delay without using FEC. Therefore, the 100GE QSFP28 PSM4 four-way parallel transmission technology meets the high-frequency computing and transaction scenarios. PSM4, CWDM4 do not have this capability, so need to exist in the fiber with FEC.

cost

In this respect, CLR4 itself has sufficiently superior performance, and like CWDM4, it uses a high-value WDM DFB laser, so the price is relatively expensive. The PSM4 only needs to use the DFB laser, so it is a little cheaper than the other two.

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