| http://www.w3.org/ns/prov#value | - Alternatively, the concave portion 10A may be formed in the area except the area facing the central part in the width direction (transverse direction) of the ridge 29.The lower cladding layer 21 is, for example, composed of n-type AlInP, and has a strip-shaped concave portion 21A which has a depth smaller than the depth D.sub.1 of the concave portion 10A, and a width smaller than the width W.sub.1
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