| http://www.w3.org/ns/prov#value | - Alternatively, as shown in FIG. 4, a nth order diffraction grating 57 (i.e., a grating having a period of n??/2, where n is an integer) may be formed on the outer surface of the upper layer 26 of the device 21 in vertically superimposed longitudinal alignment with its active region 45 for operating the device 21 as a distributed feedback (DFB) laser.
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