How Much Do You Know About the Ports on WDM Mux/DeMux?

WDM (Wavelength Division Multiplexing) Mux/DeMux (Multiplexer/De-Multiplexer) is one of the most important components of WDM systems. You can easily find that there are many ports on the Mux/DeMux with 1RU housing. So, how much do you know about them? And why we need them on the equipment?

 

Common Port

The connection point of a WDM product where combined channels appear. For a MUX product, combined channels are transmitted from the common port. For a DEMUX, the combined channels are received at the common port.

 

Express or Upgrade Port

For CWDM products, there will normally be either an upgrade or an express port, but not both. The upgrade or express port on a CWDM Mux or DeMux is used to add, drop, or pass through additional channels which enables the cascading of two CWDM Mux/DeMux modules, doubling the channel capacity on the common fiber link.

 

For DWDM products, the purpose of an upgrade port is to be able to add, drop, or pass through C-band DWDM channels not already in use, namely only channels that reside in the band 1530 – 1565 nm. If the DWDM product also has an express port, then that port is normally used for additional channels residing outside the C-band, such as most of the CWDM channels.

 

1310nm Port

The 1310nm port is a wide band optic port added to other specific CWDM wavelengths in a module. For example if an 8 channel CWDM is called out it may use wavelengths 1470 nm to 1610 nm and request the 1310nm port. The 1310nm port is used in some legacy networks and sometimes as a return path. If an existing legacy network is using 1310nm port and they have exhausted all fibers and are looking for ways to increase their network capacity they can add in other CWDM wavelengths on to the same fiber while still allowing the use of the 1310nm port. Meanwhile, it can carry LR optics, LX optics etc.

 

1550nm Port

Similar to 1310nm port, allows a legacy 1550nm signal to pass and can carry ER optics, ZR optics, LX optics, ZX optics etc.

 

Monitor Port

This port is used to monitor or test the power signal coming out of a Muxed CWDM or before it gets demuxed from the signal coming through the fiber network usually at a 5% or less power level. Generally, it can be connected with measurement or monitoring equipment, such as power meters or network analyzers. Network administrators will use this to test of monitor if a signal has failed or changed without having to interrupt the existing network.

 

WDM-equipmentAs is mentioned above, the commonly used ports on WDM Mux/DeMux are with different applications. Each device has common port, but might not has express or upgrade port, 1310nm port, 1550nm port or monitor port. These ports are belong to special service and can be custom to equip with the device according to your requirement. If you have any demand on CWDM or DWDM Mux/DeMux, as well as OADM, I highly recommended you to visit www.fiber-mart.com as they can support various of WDM equipment with competitive price and ready stock advantages.

Using 40 CH DWDM MUX/DEMUX for 500G Network

by www.fiber-mart.com

WDM technologies are considered to be the most cost-effective solution to expand the existing network without adding additional fiber optic cable. The two types of WDM architectures—CWDM and DWDM have already been widely deployed in current network systems and can support 40G/100G network easily. DWDM has advantages over CWDM as it can multiplexing more wavelengths.

 

Does 40-Channel WDM MUX/DEMUX Stop at 400G?

For the traditional 40 CH DWDM MUX/DEMUX, each port is connected to a transceiver by a length of patch cable. Currently the most commonly used optics for DWDM are 10G SFP+ modules. Thus, for a 40 CH MUX/DEMUX, up to 400G can be reached by using forty 10G DWDM SFP+ modules. Is that the limitation of DWDM network? One of the most significant spirits of this industry is challenging the limit of data rate. Actually, with a small change on the DWDM MUX/DEMUX, the capacity of DWDM network can be largely increased and it doesn’t cost much. This post will take an example of the most commonly used DWDM MUX/DEMUX which has 40 channels (from C21 to C61) in a 1R rack. But the 40 CH DWDM MUX/DEMUX that we use is a little different from the traditional ones.

 

That’s the Beauty of 1310 nm

The difference laying at the front panel of the 40 CH DWDM MUX/DEMUX—a pair of 1310 nm port is added to the device. And this is the key point why we can move another step on forward the way to increase DWDM network capacity. The following picture show the logical setup of this 40 CH DWDM MUX/DEMUX.

 

500G DWDM

 

The 1310nm port can be used for 40G/100G transceivers, like 40GBASE-LR4/ER4 or 100GBASE-LR4/ER4 transceivers. The 40G/100G signals can be multiplexed with the other 40*10G signals on the other 40 channels. Together with this pair of 1310 nm port, a 40 CH DWDM MUX/DEMUX can run up to 500G.

 

The beauty of this port is not limited to data rate increasing. It can also save a lot of money and spaces. You do not need to add another 10 ports and 10 pairs of SFP+ modules for additional 100G transmission. No change in the cabling infrastructure is required. Just a pair of 100G optics and a pair of patch cables, you can get another 100G service. The following picture shows the application of this 40 CH MUX/DEMUX with 1310nm port.

 

40CH DWDM solution

 

Cabling Solution for 40 CH DWDM MUX/DEMUX With 1310nm Port

Here offers the detailed cabling solution for this 40CH DWDM MUX/DEMUX with 1310nm port. Kindly contact sales@fiber-mart.com for more details.