An optical semiconductor device includes {HEAD ~ a plurality} of {TAIL ~ electrodes} formed on a common side of a substrate 
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An optical semiconductor device includes { HEAD ~ a plurality } of { TAIL ~ electrodes } formed on a common side of a substrate
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH