The present invention to provide an optical assembly that includes an optical device, an alignment member, and a sleeve assembly. In a segregation process executing heat treatment in an in-oxidiz-able gas atmosphere, a silicon nitride layer segregates out at the interface of the silicon substrate and the silicon oxide film. Each of the lenses has at least one aspheric surface, and the following conditions are satisfied: 0. One or more conductive traces are formed on the upper side of the adhesive tape and adhesive is provided on the other side to secure the tape to the two dice.