| http://www.w3.org/ns/prov#value | - Curved waveguides have applications to active devices such as ring lasers and integrated optical devices such as Mach-Zehnder modulators. [0047]FIG. 13a shows distributed feedback (DFB) laser structure 1300 in accordance with the invention where Al0.98Ga0.02As buried layer 1320 is accessed through etched cavities 1321 for oxidation.
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