optical bands

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optical bands

The spectrum for transmission in singlemode optical fibers has been broken into the following wavelength ranges, or bands. Typically, the wavelengths transmitted in multimode fibers are around 850 and 1310 nm, known originally as first window and second window. See satellite frequency bands.

                    Wavelength Range Band    Name       In Nanometers (nm)

 O-band  Original      1260 - 1360

 E-band  Extended      1360 - 1460

 S-band  Short         1460 - 1530

 C-band  Conventional  1530 - 1565

 L-band  Long          1565 - 1625

 U-band  Ultra-long    1625 - 1675
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References in periodicals archive ?
In my recent review article on STHs [16] I cited data in the literature for STH spin densities per unit dose increasing with increasing fictive temperature and remarked that fictive temperatures of silica-core optical fibers are much higher than those of bulk glasses, thus invoking fictive temperature as a possible reason for the difference between 2.16 and 2.60 eV STH optical bands in bulk silica [47] and the 1.63 and 1.88 eV bands in silica fibers [31, 44-46].
Thus, the experiment of [33] becomes additional evidence that radiation-induced optical bands centered near 1.63 and 1.88 eV in low-OH pure-silica-core optical fibers are truly attributable to STHs--even though these optical-fiber STHs differ from the bands at 2.16 and 2.60 eV that unambiguously characterize [STH.sub.2] and [STH.sub.1], respectively, in irradiated bulk silica [47].
At longer wavelengths, two optical bands (at 1454 and 1940 nm) are observed due to the intraband transitions.