In infrared optical communications, C-band (C for "conventional") refers to the wavelength range 1530–1565 nm, which corresponds to the amplification range of erbium doped fiber amplifiers (EDFAs). Optical Fiber Communications article in rp-photonics' Encyclopedia of Laser Physics and Technology (accessed Nov. 11 2010) The C-band is located around the absorption minimum in optical fiber, 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 DWDM ITU channels 16 (1564.68 nm, 191.6 THz) to 59 (1530.33 nm, 195.9 THz).
DWDM Channel Chart for 100GHz and 50GHz Systems: DWDM ITU Grid 100GHz Channels#GHznm#GHznm11901001577.03371937001547.7221902001576.20381938001546.9231903001575.37391939001546.1241904001574.54401940001545.3251905001573.71411941001544.5361906001572.89421942001543.7371907001572.06431943001542.9481908001571.24441944001542.1491909001570.42451945001541.35101910001569.59461946001540.56111911001568.77471947001539.77121912001567.95481948001538.98131913001567.13491949001538.19141914001566.31501950001537.40151915001565.50511951001536.61161916001564.68521952001535.82171917001563.86531953001535.04181918001563.05541954001534.25191919001562.23551955001533.47201920001561.42561956001532.68211921001560.61571957001531.90221922001559.79581958001531.12231923001558.98591959001530.33241924001558.17601960001529.55251925001557.36611961001528.77261926001556.56621962001527.99271927001555.75631963001527.22281928001554.94641964001526.44291929001554.13651965001525.66301930001553.33661966001524.89311931001552.52671967001524.11321932001551.72681968001523.34331933001550.92691969001522.56341934001550.12701970001521.79351935001549.32711971001521.02361936001548.52721972001520.25 DWDM ITU Grid 50GHz Channels#GHznm#GHznm11901001577.03371937001547.721.51901501576.6137.51937501547.3221902001576.20381938001546.922.51902501575.7838.51938501546.5231903001575.37391939001546.123.51903501574.9539.51939501545.7241904001574.54401940001545.324.51904501574.1340.51940501544.9251905001573.71411941001544.535.51905501573.3041.51941501544.1361906001572.89421942001543.736.51906501572.4842.51942501543.3371907001572.06431943001542.947.51907501571.6543.51943501542.5481908001571.24441944001542.148.51908501570.8344.51944501541.7591909001570.42451945001541.359.51909501570.0145.51945501540.95101910001569.59461946001540.5610.51910501569.1846.51946501540.16111911001568.77471947001539.7711.51911501568.3647.51947501539.37121912001567.95481948001538.9812.51912501567.5448.51948501538.58131913001567.13491949001538.1913.51913501566.7249.51949501537.79141914001566.31501950001537.4014.51914501565.9050.51950501537.00151915001565.50511951001536.6115.51915501565.0951.51951501536.22161916001564.68521952001535.8216.51916501564.2752.51952501535.43171917001563.86531953001535.0417.51917501563.4553.51953501534.64181918001563.05541954001534.2518.51918501562.6454.51954501533.86191919001562.23551955001533.4719.51919501561.8355.51955501533.07201920001561.42561956001532.6820.51920501561.0156.51956501532.29211921001560.61571957001531.9021.51921501560.2057.51957501531.51221922001559.79581958001531.1222.51922501559.3958.51958501530.72231923001558.98591959001530.3323.51923501558.5859.51959501529.94241924001558.17601960001529.5524.51924501557.7760.51960501529.16251925001557.36611961001528.7725.51925501556.9661.51961501528.38261926001556.56621962001527.9926.51926501556.1562.51962501527.60271927001555.75631963001527.2227.51927501555.3463.51963501526.83281928001554.94641964001526.4428.51928501554.5464.51964501526.05291929001554.13651965001525.6629.51929501553.7365.51965501525.27301930001553.33661966001524.8930.51930501552.9366.51966501524.50311931001552.52671967001524.1131.51931501552.1267.51967501523.72321932001551.72681968001523.3432.51932501551.3268.51968501522.95331933001550.92691969001522.5633.51933501550.5269.51969501522.18341934001550.12701970001521.7934.51934501549.7270.51970501521.40351935001549.32711971001521.0235.51935501548.9171.51971501520.63361936001548.52721972001520.2536.51936501548.1172.51972501519.86
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