According to the market demand for large transmission capacity in current optical interconnect,network managers are relying more on fiber optics, and requiring more bandwidth and faster transmission rates over ever increasing distances.
What is WDM?
Wavelength Division Multiplexing, WDM, is a technology that increases bandwidth by allowing different data streams at different frequencies to be sent over a single optical fiber network. Signals at WDM wavelengths are independent from each other.
Wave Division Multiplexing (WDM) technologies can increase capacity on the existing fiber infrastructure. WDM is a technology which multiplexes multiple optical signals onto a single fiber by using different wavelengths, or colors, of light. By utilizing WDM communication methods, network managers can realize a multiplicative effect in their available fiber’s capacity.
WDM technology— Short for wavelength division multiplexing, WDM is a way of transmitting multiple simultaneous data streams over the same fiber. Since this happens simultaneously, WDM does not impact transmission speed, latency or bandwidth. WDM functions as multiplexing multiple optical signals on a single fiber by using different wavelengths, or colors, of laser light to carry different signals. Network managers can thus realize a multiplication effect in their available fiber’s capacity with WDM.
Coarse Wave Division Multiplexing (CWDM)
CWDM increases fiber capacity in either 4, 8, or 18 channel increments. It is a method to maximize existing fiber by decreasing the channel spacing between wavelengths. Since CWDM is a passive technology, Another benefit to the passive CWDM technology is that no configuration is necessary, which makes CWDM a low-cost and effortless technology to implement. The most complex step in CWDM integration is aligning and connecting the patch cables from the correct wavelength optic to the correct port on the multiplexers on each end of the link.
The benefits of CWDM include:
- Passive equipment that uses no electrical power
- Extended Temperature Range (0˚C – 70˚C)
- Lower cost per channel than DWDM
- Scalability to grow fiber capacity with little or no increased cost
- Protocol transparent
- Simple to install and use
Drawbacks of CWDM:
- 18 channels may not be enough, and fiber amplifier cannot be used with them
- Passive equipment that has no management capabilities
- Not the ideal choice for long-haul networks
Dense Wave Division Multiplexing (DWDM)
Dense wavelength division multiplexing (DWDM) is a technology that puts data from different sources together on an optical fiber, with each signal carried at the same time on its own separate light wavelength. Using DWDM, is a layer-1 transport technology that multiplexes several optical signals into the same fiber by using different wavelengths (colors). It allows you to transport more data across existing dark fiber infrastructure.up to 80 (and theoretically more) separate wavelengths or channels of data can be multiplexed into a light-stream transmitted on a single optical fiber.
Benefits of DWDM:
- Transparency: due to that DWDM is with a physical layer architecture, it can transparently support both TDM and data formats such as ATM, Gigabit Ethernet, ESCON, and Fibre Channel with open interfaces over a common physical layer.
- Scalability: DWDM can leverage the abundance of dark fiber in many metropolitan area and enterprise networks to quickly meet demand for capacity on point-to-point links and on spans of existing SONET/SDH rings.
- Dynamic provisioning: fast, simple, and dynamic provisioning of network connections give providers the ability to provide high-bandwidth services in days rather than months.
Drawbacks of DWDM:
- DWDM solutions are quite expensive
- Active DWDM solutions require a lot of set-up and maintenance expense
CWDM Mux / Demux
Using CWDM multiplexing technology paired with wavelength specific optics in Transition Networks’ fiber optic devices and switching products allows you to realize the full benefit of CWDM technology. The modular approach that Transition Networks takes toward CWDM deployments makes scaling a project to fit your exact needs easy and affordable. Transition Networks also offers products that optimize standard fixed optic wavelengths on existing products by converting them to the appropriate CWDM “color” or wavelength.
DWDM Mux / Demux
the common configuration of DWDM Mux/Demux is from 8 to 96 channels. Maybe in future channels can reach 200 channels or more. DWDM system typically transports channels (wavelengths) in what is known as the conventional band or C band spectrum, with all channels in the 1550nm region. The denser channel spacing requires tighter control of the wavelengths and therefore cooled DWDM optical transceiver modules required, as contrary to CWDM which has broader channel spacing un-cooled optics, such as CWDM SFP, CWDM XFP.
To sum it up, With DWDM Mux/DeMux, single fibers have been able to transmit data at speeds up to 400Gb/s. there is no doubt that DWDM technology will reshape the future communication network by virtue of its various advantages and applications in many aspects.To expand the bandwidth of your optical communication networks with lower loss and greater distance capabilities.
WDM solution capacity expansion in a more cost-effective, simplified and flexible way.Fiber-MART can help you to choose the right WDM solution.Any question pls feel free to contact us .E-mail: Service@fiber-mart.com