| http://www.w3.org/ns/prov#value | - In particular, as illustrated in FIG. 3, a fiber of the Si/Al or Si/Ge type which is doped with Er3+ and which is suitable for use in optical amplifiers, has a high intensity emission peak at a wavelength of 1536 nm, while at greater wavelengths, up to about 1560 nm, there is an area in which the emission still has a high intensity but lower than that of the peak area.
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