Tag Archives: OADM

How to Use OADM in WDM Network

Adding or Dropping signals of devices on the existing WDM network is very common to service providers. Adding a new fiber optic cable for signal transmission of the devices would cost too much. The using of OADM (Optical Add-Drop Multiplexer) solves this problem easily. A OADM can couple two or more wavelengths into a single fiber as well as the reverse process. Service providers can save a lot of money and installation time by adding OADM into the existing WDM network, if they want to add or drop signal on a single fiber.

WDM Solution

Types and Selection of OADM

OADM is generally deployed in WDM network which includes CWDM (coarse wavelength division multiplexing) and DWDM (dense wavelength division multiplexing). Thus, OADM can also be divided into CWDM OADM and DWDM OADM according to its applications. During the selection of OADM, the fiber count that a OADM should be considered. The most commonly used CWDM OADM can add or drop fiber count of 1, 2 and 4. For DWDM OADM, the fiber counts are usually 1, 2, 4 and 8. The installation environment should also be considered during the selection of OADM. There are mainly three types of OADM with different package form factors: plug-in module, pigtailed ABS box and rack mount chassis. The plug-in modules can be installed in empty rack enclosures. The following shows three CWDM OADM with different package form factor.

 4-channel OADM plug-in module  4-channel rack OADM  4-channel pigtailed oadm
Plug-in module OADM Rack mount OADM Pigtailed ABS box OADM
How to Connect OADM With WDM MUX/DEMUX

In most cases, OADM is deployed with CWDM or DWDM MUX/DEMUX. It is usually installed in a fiber optic link between two WDM MUX/DEMUXs. The following picture shows a CWDM network using a 1-channel dual fiber OADM between two CWDM MUX/DEMUXs. Signals over 1470 nm are required to be added to and dropped from the dual fiber link. On the OADM, there are usually one port for input and one port for output. The OADM can be regarded as a length of fiber cable in the fiber link. The point is the one or more strand of signals is added or dropped when the light goes through the OADM.

1-channel OADM

To better illustrate the using of OADM. Here takes the example of a 4-Channel CWDM OADM. This 4-channel OADM supports wavelengths of 1470nm, 1490nm, 1510nm and 1530nm. West port is connected to a CWDM MUX/DEMUX and the East port in connected to the other CWDM MUX/DEMUX on the other end of this fiber link. Up to 4 different wavelengths of optical signals can be added or dropped. The four Channel ports can be connected to the corresponding CWDM transceivers installed on switches. Then a CWDM fiber link with OADM is finished.

4-channel OADM

OADM Solution

OADM is a cost-effective and easy to use passive fiber optic component, which can provide easy to build and grow connectivity environment for WDM network. FS.COM provides full series of WDM MUX/DEMUX and CWDM OADM and DWDM OADM. Kindly contact sales@fs.com for more details.

Reuse technology analysis of optical network

Within optical dietary fiber conversation, multiplexing technologies is actually regarded as prolonged so far as we all know, the capability associated with optical dietary fiber system architectural. FDM as well as WDM usually believe that there’s basically absolutely no distinction in between, to help you believe that WDM is actually “rough”, as well as rate of recurrence department multiplexing is really a “niche”, in order to place both 1 class. Wavelength department multiplexing (DWDM) tend to be talked about beneath, sparse wavelength department multiplexing (CWDM), transplanting multiplexing (higher) along with optical multiplexing technique. 


So-called DWDM (Thick exactly where Department Multiplexing) technologies, is also the folks frequently state how the DWDM, describes a type of optical dietary fiber information tranny technologies, this particular technologies UTILIZES laser beam Wavelength based on little bit parallel tranny collection or even chain information tranny setting within optical dietary fiber tranny.DWDM very first launched the actual optical transmission designated to some specific music group inside the specific rate of recurrence (wavelength, lambda), then your transmission multiplexing right into a solitary dietary fiber, in this manner may significantly boost the bandwidth associated with may be lounging optical cable television. Because of intro (inbound) transmission within optical coating doesn’t quit, the actual price from the user interface as well as platforms may stay impartial, this enables providers in order to DWDM technologies as well as system integration associated with current gear as much as, simultaneously received the present lounging optical cable television didn’t possess to utilize a large amount of bandwidth.DWDM may complement the actual several optical transmission tranny, the outcomes from the optical transmission could be increased to the exact same team simultaneously with just one optical dietary fiber tranny, the actual bandwidth from the system is actually significantly elevated. Every showing indicators could be arranged in order to various tranny price (OC — 3/12/24, and so on. )#) and various platforms (SONET, ATM, information, and so on. )#).The DWDM systems, for instance, could be combined within DWDM depending on OC — forty eight (two. 5 Gbps) as well as OC — 192 (10 Gbps) 2 price associated with SONET transmission. To achieve around forty Gbps associated with large bandwidth. Ownership associated with DWDM program within the over objective simultaneously may nevertheless keep up with the exact same degree of program overall performance and also the current tranny techniques, dependability as well as balance. Long term DWDM fatal may have an overall total in excess of eighty wavelengths much more OC — forty eight in order to two hundred Gbps or even move price is actually up to forty wavelength associated with OC — 192 in order to four hundred Gbps associated with tranny price, the actual bandwidth may be sufficient in order to inside 1 2nd tranny 90000 quantities from the encyclopedia!(Related products inDWDM MUX DEMUX)

2. FDM technologies

FDM may be the gentle surf within optical dietary fiber tranny based on it’s rate of recurrence split in to gentle influx funnel, every funnel because impartial associated with info company. To attain inside a multi-channel multiplexing associated with optical dietary fiber tranny. FDM technologies could be coupled with WDM technologies, help to make the actual recycle method end up being bending, specifically the very first rough factors based on the wavelength associated with gentle influx, when the thickness of every funnel is actually lambda, is at every thickness is actually Δ lambda funnel, in order to fill the actual stations (f1, f2,…,fn), every funnel may also impartial associated with fill info. Simply because coherent optical conversation has an superb selectivity, FDM technologies and it is mixture, produces the actual FDM technologies associated with optical dietary fiber system useful problems. Optical FDM multiplexing technologies gear complicated, the actual overall performance from the optical products need is actually higher, therefore joined the actual phase associated with useful architectural require lots of work.


DWDM (thick wavelength department multiplexing) may be the technologies of preference with regard to dietary fiber optic programs, however it’s costly cost impact it’s broad software. When confronted with marketing communications marketplace need, CWDM (sparse wavelength department multiplexing) occurs in the historical second.Sparse wavelength department multiplexing, just like it’s title suggests, is really a near family member associated with DWDM, the actual distinction primarily offers 2 factors:

3. 1 CWDM company funnel spacing is actually broad, consequently, exactly the same optical materials may recycle wavelength associated with gentle surf close to 5 or even 6, “sparse” as well as “intensive” name in order to that the distinction;

3.2 rain fall submission upon 10-12 CWDM modulation laser beam utilizing uncooled laser beam, laser beam as well as DWDM used is actually awesome. Laser beam air conditioning retreats into heat tuning, uncooled laser beam retreats into digital tuning. Simply because inside a broad wavelength area heat submission is extremely unequal, because of the heat tuning had been very hard in order to put into action, expenses tend to be higher. CWDM eliminates the problem, therefore significantly decreased the price, the actual CWDM program price is just 30% associated with DWDM.(Related products in CWDM MUX DEMUX)

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