Metropolitan Area Network Access Layer CWDM Multiplexer Technology

Due to the rapid growth and development of data services, network convergence speed accelerated MAN has become a hotspot of network construction, and much more responsive to pressure of market competition helps to make the expense of telecom operators on the network (including construction costs and operation and maintenance costs). MAN because of this market demand, low-cost CWDM products are located. MAN, short transmission distance, do not have to use the amplifier, optical fiber transmission attenuation value is less sensitive cwdm multiplexer technology can reduce the performance requirements with the device, components, thus greatly lowering the cost.
The spacing between the transmission of different wavelengths inside the same fiber will be the main parameter to differentiate between DWDM and CWDM. The wavelength interval with the DWDM system 200GHz (1.6nm), 100GHz (0.8nm) or 50GHz (0.4nm), future systems will have a more narrow pitch. DWDM system, DFB (distributed feedback) laser because the source of light, the temperature drift with the latter coefficient of 0.08nm /°C, it must use a cooling way to stabilize the wavelength, to prevent alterations in wavelength due to temperature drift to the multiplexer demultiplexing a filter passband.
CWDM (Coarse Wavelength Division Multiplexing) systems, coarse wavelength division multiplexing system, can be a low-cost WDM transmission technology for MAN access layer. Principle, CWDM may be the use of the optical multiplexer to several wavelengths of light signals multiplexed with a single optical fiber for transmission, at the receiving end from the link, using the optical demultiplexer fiber mixed signal is decomposed into different wavelengths signal, attached to the respective receiving apparatus. The main difference is that with all the DWDM: 0.2nm to a single.2nm wavelength interval according to the DWDM method is concerned, CWDM includes a wider wavelength interval, the accepted standards wavelength intervals of 20 nm.

CWDM technology optimum use with the characteristics of your short transmission distance with the MAN, without by EDFA amplification band limited, but might be about the entire optical fiber transmission window within the 1310-1560 nm wavelength interval much wider than DWDM system wave stars multiplexing. As a result of wide wavelength interval, the transmission distance is short, CWDM without choosing the expensive high wavelength stability and a high dispersion tolerance of the laser, which may greatly reduce the laser cost. In addition, CWDM without selecting costly dense wavelength division demultiplexer and multiplexer, simply select the cheap coarse wavelength division multiplexer and demultiplexer; without complex control technology to maintain high system requirements; Simply using less costly compared to the multichannel laser without the need for EDFA, send or receive like a relay. Reduce device cost and system requirements, CWDM system cost than DWDM systems have dropped significantly.
Even though cost is lower cost than DWDM, CWDM systems and DWDM interface to aid multi-service SDH interface, as an example, can provide IP / Ethernet over SDH, ATM, over SDH; provide direct fiber connection port for the routers and ATM switches, IP / Ethernet over Optical and ATM over Optical. CWDM system can also use OUT (optical transmission unit) and OADM (optical add / drop multiplexing) with the use of standard wavelength DWDM system interconnect ring or access DWDM backbone layer.CWDM 1310nm SDH system compatibility has been traditionally used in MAN, the current DWDM can not do this. The CWDM technology also offers the potential applied to the long-distance transmission capacity, broadband LAMAN (Raman) optical amplifiers into the commercial the CWDM technology there's prone to enter in the long-distance transmission market.
CWDM by larger wavelength interval in order that the optical transceiver modules and passive optical multiplexer / demultiplexer, cost reduction, and business transparency, simple operation and maintenance, scalability advantages, so from the industry attention, but CWDM cost advantage just isn't outstanding, the equipment just isn't perfect, the tiny number of optical channels. With the increase of the market and technology development, located in the metropolitan area network access layer CWDM technology can have a good prospect of application.
Fiberstore can be a fiber optic supplier having a variety of fiber optic products in store able to shipped to you.For instance,buy some CWDM ,you maybe need the CWDM OADM module,it is built to optically add/drop one or multiple CWDM channels into one or two fibers.Whether your network has 1 or 2 cores of fiber, redundant network, ring or linear network design etc, we are able to offer various OADM configurations to tailor fit your network architect. Please contact us for additional information.