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Reference.org
C band (infrared)
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<p>In <a href="/facts/Infrared/44XdJNcc">infrared</a> <a href="/facts/Optical_communications/gshoNBto">optical communications</a>, C-band (C for "conventional") refers to the <a href="/facts/Wavelength/kcJU0ymz">wavelength</a> range 1530–1565 nm, which corresponds to the amplification range of erbium doped fiber amplifiers (<a href="/facts/EDFA/1Fj9Pfes">EDFAs</a>). The C-band is located around the <a href="/facts/Fiber-optic_communication/dc6S0Hg5">absorption minimum</a> in <a href="/facts/Optical_fiber/5ruuIFbj">optical fiber</a>, where the loss reaches values as good as 0.2 dB/km, as well as an atmospheric transmission window (see figures). The C-band is located between the short wavelengths (S) band (1460–1530 nm) and the long wavelengths (L) band (1565–1625 nm). It includes the 100 GHz-spaced <a href="/facts/DWDM/xSkNRxfu">DWDM</a> <a href="/facts/ITU/xnT5QSEl">ITU</a> channels 16 (1564.68 nm, 191.6 THz) to 59 (1530.33 nm, 195.9 THz). </p>