CWDM


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Related to CWDM: SDH

CWDM

(Course WDM) An optical transmission method that is used for shorter distances than dense WDM (DWDM). Also known as "wide WDM," CWDM transmits fewer channels and uses wider spacing between the channels for distances up to 60 km. Wider spacing up to 25 nm, compared to 1.6nm and smaller for DWDM, tolerates more temperature fluctuation.

Standardized by the IEEE in 2004 for 10 Gigabit Ethernet, CWDM components are much less costly than DWDM because the laser does not have to be stabilized, and an external modulator is not required. The laser can be modulated directly by changing the drive current. CWDM operates between 1265 and 1625 nm compared to DWDM's tighter 1530-1620 range. See WDM.
References in periodicals archive ?
It specializes in developing and manufacturing high performance optical transceivers and telecom sub-system components with particular applications to metro and long-haul transmission, Datacom, CWDM and DWDM.
In order to connect communication devices into the MUX, the optics from each device must be converted to specific CWDM wavelengths.
Our CWDM service is a cost-effective, robust solution that delivers premium networking power and impact for the leading mid-sized business facing such challenges.
With the newly added CWDM GPON, Source Photonics offers all next generation PON solutions.
Optowiz, launched in 2007 with headquarters office in Korea, specializes in developing and manufacturing high performance optical transceivers and telecom sub-system components with particular applications to metro and long-haul transmission, Datacom, CWDM and DWDM.
Thanks to our new CWDM OTDR, they have access to eight wavelengths in a single compact platform, without swapping modules," said Etienne Gagnon, EXFO's Vice-President of Product Management and Marketing.
The iConverter CWDM MUX/DEMUX and OADM products are completely passive and require no external power.
CWDM systems are mainly being deployed in metropolitan areas where network operator customer groups are densely concentrated and can be reached within a reasonable system link span without the need of optical amplifiers.
The new transceivers are offered at all wavelengths specified in the ITU-standard CWDM grid (G.
The CWDM OTDR solution was developed to help cable operators, dark fiber providers and telecommunications service providers characterize maintain and troubleshoot CWDM fiber networks more comprehensively than ever before.
The PM 1008's aggregation capabilities enable service providers and enterprises to reduce the number of wavelengths used in CWDM or DWDM networks, reducing costs while increasing transport capacities.
Motorola's new E-CWDM technology increases downstream service delivery capacity over cable networks by transmitting multiple CWDM optical signals over a single fiber optic connection, enabling operators to segment serving areas into three, four or five discrete areas.