40CH DWDM Mux Insertion Loss Testing

May 2, 2017

DWDM, which can add great capacity for long-haul backbone data center by multiplexing different wavelengths into one fiber, is one of the dominant technology used in various applications. When purchasing a DWDM Mux Demux, one of the vital parameters to consider is the insertion loss. Higher insertion loss means more investment in DWDM network deployment. This post focuses on the insertion loss testing of 40CH DWDM Mux to offer help for your DWDM Mux Demux purchase.

40ch dwdm mux

Understand DWDM Mux Insertion Loss

Network insertion loss is the total optical power loss (often measured by dB) caused by the insertion of an optical component. Any component in a fiber optic interconnection will introduce loss. The insertion loss is affected by the fiber core meter on the transmit and receive end, as well as the receive conditions in two joint fibers.

In a completed network, the total loss comes not only from the optical connectors, but also from optical cables and the diverse ports of optical components inserted. As we all know, there are several types of port on 40CH DWDM Mux Demux: line port, channel port and monitor port, some Muxes may have other function ports like 1310nm port, 1510nm port and expansion port. No matter which type of ports is connected to a DWDM system, insertion loss occurs. Therefore, in order to ensure good performance of a whole DWDM optical link, a high quality DWDM Mux Demux should have a reasonable insertion loss value.

40ch dwdm mux demux

Insertion Loss Comparison in Different Vendors

If you are familiar with DWDM Mux Demux, you may know how great impact the insertion loss has on the whole network links. The higher the DWDM channel insertion loss is, the more cost needed, for optical amplifiers are required to keep a balance signal power in the link. And there are many vendors and suppliers of 40CH DWDM Mux in the market. Here is a graph showing the maximum insertion loss value of 40CH DWDM Mux of different vendors.

mux demux insertion loss

In a DWDM networks, the budget loss mainly comes from optical fiber path loss, DWDM OADM and Mux/Demux. If the loss of them is high, the network deployment cost will get higher certainly. In this graph, the vertical axis stands for the max insertion loss, and the horizontal axis shows several DWDM Mux vendors or suppliers like Cisco, Finisar, MRV, FS, etc. From this comparison, we can see all the max insertion loss of 40CH DWDM Mux are not very high. The max insertion loss of MRV is 7.5dB, Cisco is 6.5dB and Finisar is 5dB. But compared with these vendors or suppliers, FS 40CH DWDM Mux has the lowest max insertion loss—4.5dB. Besides, the typical insertion loss of FS 40CH DWDM Mux is only 3dB. All these indicate that FS 40CH DWDM Mux is perfect for long haul DWDM transmission.

How to Do Insertion Loss Testing for 40CH DWDM Mux Demux?

Since insertion loss has profound influence on the whole optical networks, knowing how to test the insertion loss of 40CH DWDM Mux Demux is important. Insertion loss testing can be finished with an optical power meter if no professional equipment is available. Here offers a video to illustrate the insertion loss testing of our 40CH DWDM Mux, which uses Cisco Catalyst 4948E switch and our Cisco C25 compatible 10G DWDM SFP+ and C60 DWDM SFP+ modules that support 80km as light sources. This testing just takes channel 25 port and channel 60 port as examples to explain the testing method. 


High quality, low insertion loss 40CH DWDM Mux Demux can not only manage bandwidth and expand capacity of existing optical backbones, but also save cost in DWDM network design. FS 40CH DWDM Mux Demux  is a high density, low insertion loss passive modules, providing an ideal solution for DWDM networks. Custom services are also available. If you are interested, visit our website or contact us via for more detailed information.


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