100G DWDM QSFP28 optical transceiver overview

100G DWDM QSFP28 optical transceiver overview

At present, in the field of optical communication, almost all 100G switch interfaces are QSFP28 interfaces. In order to realize multi-channel 100G long-distance point-to-point dual-fiber transmission, it must be applied to the 100G DWDM transmission scheme. Coherent 100G DWDM transmission system is a new application of metropolitan area network and a better solution for high-speed and large-capacity transmission.
100G coherent DWDM enables customers to extend or upgrade existing 10G/40G networks to 100G applications without changing the original infrastructure, enabling higher bandwidth and spectrum utilization.
The application of communication technology and the explosive growth of cloud data traffic have put forward higher transmission performance requirements for the physical layer, which is the basis of the entire communication system, promoted the development of coherent optical communication, and further improved the effect of total communication capacity and transmission distance. based on the WDM system.

100G DWDM QSFP28 optical transceiver

The 100G DWDM QSFP28 dual-carrier transceiver is a hot-pluggable QSFP28 MSA form factor that can transmit up to 80km over SMF(single-mode fiber). It uses PAM4 modulation format on 100GHz ITU DWDM wavelength grid compatible. The manufacture of the 100G DWDM QSFP28 transceiver is based on a highly integrated silicon photonic chip.
The 100G QSFP28 DWDM optical module uses a non-adjacent dual-carrier wave optical transceiver. Its optical transceiver adopts a DWDM EML laser and PIN/APD detector made by Fiber Mall, combined with a self-made cyclic array waveguide grating (AWG) multiplexer, which can realize channel interval 50GHz DWDM transmission, support the working range of commercial temperature (0 ~ 70 ℃), and the typical power consumption is 5W.
The performance has reached the leading level in the industry, and combined with Fiber Mall’s optical amplifier and adaptive dispersion compensation module, it can realize point-to-point transmission of more than 100km. At the same time, the solution can be extended to non-adjacent four carrier optical modules of 200GE and higher versions. At present, Fiber Mall has formed 25G, 50G, and 100G color light series optical module solutions.
The introduction of a 100G QSFP28 DWDM transceiver to the market is a significant step forward in overcoming the difficulties of DWDM networking in their equipment. Customers who want to build an embedded DWDM network can use this transceiver directly in the switch. It’s a very simple and cost-effective solution.
However, there’s one small fact that you should consider if you’re going to apply the 100G DWDM optical network – it needs amplification to get out of the blocks and dispersion compensation to go beyond 5-6km. A separate DWDM multiplexer with an amplification system and dispersion compensation is therefore required to connect data centers together.

100G DWDM QSFP28 Solutions:

Passive DWDM MUX 1X100G QSFP28 DWDM 120KM Solution
Passive DWDM MUX 4X100G QSFP28 DWDM 80KM Solution


In today's data interconnection, 100G DWDM QSFP28 has become a popular product for network operators recently. PAM4 technology is ideal for extending 100G signals.
All in all, the 100G DWDM QSFP28 is designed for data centers where interconnect applications require high fiber capacity for links up to 80 km. The optical interface utilizes two DWDM wavelengths on the 50GHz grid. The PAM4 modulation format is used to increase capacity, achieving 50Gb/s on each wavelength. Finally, another point to note is that an optical amplifier is required to implement a 100G DWDM solution.
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