Tag Archives: CWDM MUX/DEMUX

Economically Increase Network Capacity With CWDM Mux/DeMux

As the demands for voice, video and data networks are increasing dramatically, more bandwidth and higher transmission speed over long distances are needed. To meet these demands, it means that service providers should depend on more fibre optics which definitely cause more costs for optical devices. But they apply Wavelength Division Multiplexing (WDM) technologies which is a cost-effective way to increase capacity on the existing fibre infrastructure.

CWDM Technology

WDM technology multiplexes multiple optical signals onto a single fibre by using different wavelengths, or colors, of light. WDM can expand the network capacity using existing fibre infrastructure in an economical way. It includes CWDM (Coarse Wavelength Division Multiplexing) and DWDM (Dense Wavelength Division Multiplexing).

CWDM is a technology multiplexing 16 channels onto one single fibre between the wavelengths from 1270 nm to 1610 nm. It’s designed for city and access network. Since the channel spacing is 20 nm, CWDM is a more cost-effective method to maximize existing fibre by decreasing the channel spacing between wavelengths. CWDM is a passive technology, therefore, CWDM equipment needs no electrical power.

cwdm-channel

Figure 1

CWDM technology has been applied into wide areas, such as CWDM optical transceivers, CWDM OADM and CWDM Mux/DeMux. CWDM Mux/DeMux modules are multiplexers and demultiplexers which provide long distance coverage with premium optical technology to enhance fibre optic systems. It multiplexes signals of different wavelengths on one single fibre and demultiplexes wavelengths to individual fibres. CWDM Mux/DeMux can offer low-cost bandwidth and upgrade the existing system without leading spare costs on more fibres. CWDM Mux/DeMux can hold up to 18 channels of different standards (for example, Fibre Channel, Gigabit Ethernet) and data rates over one fibre optic link without interruption. FS.COM offers a full series of CWDM Mux/DeMux, including 2, 4, 8, 9, 12, 16, 18 channels with or without monitor port and expansion port in 1RU 19” rack chassis or pigtailed ABS module. The following will show you how to use a 18-channel CWDM Mux/DeMux to increase the data rates up to 180 Gbps on a fibre pair.

In Figure2, all Cisco compatible 10G CWDM SFP+ 1270-1610 nm 40km DOM transceivers on the switch are connected with the CWDM Mux/DeMux by LC-LC fibre patch cords. This CWDM Mux/DeMux has 18 channels and is designed as 1 RU rack mount size, covering the wavelengths from 1270 nm to 1610 nm and supporting LC UPC port. During the long distance transmission, only one single-mode armored LC fibre patch cord is needed to achieve 180 Gbps by connecting the two 18-channel CWDM Mux/DeMux. Thus, it greatly saves the cost for increasing the bandwidth on the existing fibre infrastructure.

cwdm-mux-18ch

Figure 2

FMU CWDM Mux/Demux

To increase the capacity, it requires more space and cable management is also a big trouble. So FS independently researched and developed FMU CWDM Mux/DeMux to solve this problem. We provide FMU 16-ch 1U Rack CWDM MUX/DEMUX specially designed as 2-slot plug and play style, which allows you to add or remove fibre optic cables and plug-in-modules freely according to your applications. There are two separate CWDM plug-in modules. One is high band (1470nm-1610nm) module with an expansion port and the other is low band (1270nm-1450nm, skip 1390nm, 1410nm) module without expansion port. Via this expansion port, channels can be expanded over one pair of fibre without interruption. You can also insert two CWDM Mux/DeMux FMU-plug-in modules without expansion port for two separated 8-channel connections. Besides, you can mix CWDM and DWDM system by adding CWDM Mux/DeMux FMU-plug-in modules and DWDM Mux/DeMux FMU-plug-in modules with matching wavelengths.

2-slot-cwdm-mux2

Figure 3

FS.COM FMU Plug-in Modules

The table below lists both single fibre and dual fibre FMU plu-in modules for 2-slot CWDM Mux/DeMux. You can choose suitable modules according to you specific requirements. Custom service is available, too.

ID# Description
58215 4 Channels 1270-1610nm Single Fibre CWDM Mux Demux, FMU Plug-in Module, LC/UPC
68215 9 Channels 1270-1610nm Single Fibre CWDM Mux Demux, FMU Plug-in Module, LC/UPC
42972 4 Channels 1270-1330nm Dual Fibre CWDM Mux Demux, FMU Plug-in Module, LC/UPC
43097 8 Channels 1470-1610nm Dual FibreCWDM Mux Demux, FMU Plug-in Module, LC/UPC
43099 8 Channels 1470-1610nm Dual FibreCWDM Mux Demux with Expansion Port, FMU Plug-in Module, LC/UPC
Conclusion

If you would like to increase your network bandwidth while spend less money on changing existing infrastructure, CWDM Mux/DeMux is an economical solution. FS.COM brings you high quality CWDM Mux/DeMux module and newly self-developed FMU 2-slot CWDM Mux/DeMux modules & FMU plug-in modules. For detailed information, please visit our site www.fs.com or contact us through sales@fs.com.

User Guide for CWDM MUX/DEMUX

Is there a way to enhance your network system but also save cost, time and effort? Do you want to give up traditional model of using many fibre cables? The cost-effective way is to use the CWDM MUX/DEMUX (coarse wavelength division multiplexing multiplexer/demultiplexer). If you are the first time to use it, you are lucky to read the following content.

18-ch-cwdm-muxdemux

CWDM Mux/Demux Introduction

First you need to know what CWDM is. CWDM is a technology which multiplexes multiple optical signals on a single fibre by using different wavelengths of the laser light to carry different signals. CWDM MUX/DEMUX applies this principle. A CWDM MUX/DEMUX can maximize capacity and increase bandwidth over a single or dual fibre cable. It mixes the signals in different wavelengths onto a single fibre and splits it again into the original signals at the end of a link. This kind of device is used to reduce the number of required fibre cables and get other independent data links. CWDM MUX/DEMUX modules are wide from 2 channels to 18 channels in the form of 1RU 19’’ rack chassis. The following will take 9 channels 1290-1610nm single fibre CWDM Mux/Demux as an example. It’s a half 19’’/1RU module for LC/UPC connection.

Features are as follows:
  • Support up to 9 data streams
  • Wavelength range: 1260~1620 nm
  • Low insertion loss, half 19’’/1RU module low profile modular design
  • Passive, no electric power required
  • Simplex LC/UPC for line port
  • Duplex LC/UPC for CWDM channel port, easily support duplex patch cables between the transceiver and passive unit
  • Operating temperature: 0~70℃
  • Storage temperature: -40~85℃
9cwdm-2743-1u-lc-sfb
Preparation for Installation

To connect the CWDM Mux/Demux, you need two strands of 9/125μm single-mode fibre cables. Supportable transceivers cover the wavelengths of 1290 nm, 1370 nm, 1410 nm, 1450 nm, 1490 nm, 1530 nm, 1570 nm 1610 nm. And this device is used together with 9 CWDM-2759-LC-LGX-SFB.

front-channel

To ensure a reliable and safe long-term operation, please note the points below:

  • Only use in dry and indoor environments.
  • Do not locate CWDM Mux/Demux in an enclosed space without airflow since the box will generate heat.
  • Do not place a power supplies directly on top of a unit.
  • Do not obstruct a unit’s ventilation existing holes.
System Installation Procedures

1.To install CWDM MUX/DEMUX system, switch off all devices.
2.Install CWDM transceivers. Remember each channel has a unique transceiver with a certain wavelength. So each transceiver must be plugged into the appropriate channel and must not be used more than once in the system. Devices pairs must carry transceivers with the same wavelength.
3.Connect CWDM MUX/DEMUX units with matching cables (single-mode fibre). Before connecting cable, you should first inspect if the connectors are lean. Never forget cleaning work is an important factor to achieve a better network performance. The guidelines:

  • Keep connectors covered when not in use to prevent damage.
  • Usually inspect fibre ends for signs of damage.
  • Always clean and inspect fibre connectors before make a connection.

4. Power up the system.

Troubleshooting

When you connect the system, but you find there is not data link. Then you need to do:

  • 1. Check the attached devices by directly connecting CWDM MUX/DEMUX units using a short fibre cable.
  • 2. Check the fibre cables and fibre connectors.
  • 3. Check that each wavelength doesn’t occur more than once at the CWDM MUX/DEMUX units.
  • 4. Check if the transceivers are inserted into the matching port at the CWDM MUX/DEMUX units.
Conclusion

CWDM MUX/DEMUX is a cost-effective solution for expanding bandwidth capacity for short link communication. Besides saving costs, CWDM lasers consume less power and take up less space. FS.COM offers both CWDM MUX/DEMUX and DWDM MUX/DEMUX with high quality. If you are the first time to use these devices, keep in mind the above notes.