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