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 ?
For many years, Canal wall down Mastoidectomy (CWDM) was considered to be the gold standard for the management of cholesteatoma.
Since 2003, Inneos has developed and manufactured embedded optical modules with CWDM technology used to transmit high definition video in medical, industrial, and consumer A/V markets.
(6) They found that compared with ICWM, CWDM offered significantly superior visualization of the lateral epitympanum, posterior crus of the stapes, and sinus tympani.
Two separate four CWDM wavelengths may require 3 coupling lengths.
CWDM systems do not require amplifiers, and they use less-expensive, non-stabilized lasers in conjunction with broadband filters to provide a wider spacing that supports up to 18 wavelengths.
The Ekinops 360 platform allows for long-haul fiber spans at a fraction of the cost, size, and complexity of other CWDM and DWDM systems.
Prized for its low cost and simplicity, coarse wavelength division multiplexing (CWDM) technology has had significant attention in both research and applications in recent years, and has broadened the market considerably.
The configuration continuously sweeps over several lasers from 1,250 nm to 1,650 nm to characterize CWDM, FTTx, or WDM optical components.
In support of standards currently under development by the IEEE 802.3 Higher Speed Study Group, Apogee Photonics is developing a family of uncooled coarse wavelength division multiplexing (CWDM) lasers that will support aggregate data rates of more than 100Gb/s.
Additionally, the agile optical networking solution must support both Coarse Wavelength Division Multiplexing (CWDM) and Dense Wavelength Division Multiplexing (DWDM) on the same network elements, provide a seamless migration strategy for investment protection and support legacy services to maintain existing customers and revenues.
CWDM devices are gradually increasing while WDM and SONET/SDH remain stagnant.
Other versions support SpectraStream Coarse Wavelength Division Multiplexing (CWDM) technology, providing conversion of optical signals into CWDM-compatible optical signals.