Description
By providing channel spacings of 50 GHz (0.4 nm), 100 GHz (0.8 nm) or 200 GHz (1.6 nm), several hundreds of wavelengths can be placed on a single fiber. Most typical DWDM systems use 40 or 80 channels, although this number can be as high as 160.
The ITU-T G.694.1 frequency grid specifies the wavelengths used in DWDM. They are found in the C-band (1525-1565 nm) and L-band (1565-1620 nm), which is a spectral range that proves very attractive for DWDM. The reason is because it allows amplification with erbium-doped fiber amplifiers (EDFA).
Long-haul, metro and now cellular backhaul networks
DWDM is the most suitable technology for long-haul transmission because of its ability to allow EDFA amplification. This is why it was adopted in these networks a few decades ago. Given the growing need for bandwidth to driven by data-hungry applications (smartphones, video streaming, etc.), DWDM has now found its way into metro networks, and is even being used in some cellular backhaul deployments.
DWDM network testing
DWDM networks must be tested for loss, connector cleanliness, dispersion and spectral quality. EXFO offers all the right tools to ensure smooth DWDM operation, including inspection probes, OTDRs, power meters, dispersion testers and optical spectrum analyzers.
740C xWDM OTDR Series
C-band DWDM and 18-wavelength CWDM tunable OTDR series for metro Ethernet, remote PHY and passive C-RAN link characterization.
FOT-5205 - DWDM channel checker
Handheld channel checker for monitoring DWDM channels and measuring their power
FTB 5GPro
FTB-5500B - PMD analyzer
Delivers fast and reliable performance in a field-ready unit for all chromatic and polarization dispersion testing needs, from verifying the capacity of legacy fiber to upgrading a network to a given rate.
FTB-5600 - Distributed PMD analyzer
The only distributed PMD analyzer on the market, offering simplified PMD assessment for identification of faulty sections on links.
FTB-5700 - Single-ended dispersion analyzer
Optimized CD/PMD characterization with single-ended testing of multiple links from one location
FTBx-5245/5255 - Optical spectrum analyzers for the field
In addition to delivering all the tools needed for maximum field efficiency, the FTBx-5245/5255 provides improved reliability, accuracy and speed of test. It can be housed in the compact and portable FTB-2 Pro and FTB-4 Pro platforms or in the rack-mountable LTB-8 platform.
FTBx-5245 5255 Lab - Optical spectrum analyzers for the lab
Highly accurate, easy-to-use intelligent optical spectrum analyzers (OSAs) for analysis of CWDM and DWDM networks.
Optical Wave Expert - DWDM Channel Checker and OTDR
Now available in MaxTester and FTBx format. A handheld tester combining DWDM channel power validation with OTDR capabilities on a single port.