A zero-clearance receptacle for single mode optical fiber couplers. A high voltage tolerant transistor formed over a semiconductor substrate includes: a well region of a first conductivity type; a first impurity region as the source region; and a second impurity region as a drain region. When the circuit forming metal plate is formed, the electronic part is bonded directly to the other side of the circuit forming metal plate. The blue filter layer allows only blue light to pass therethrough and absorbs other color light. The unsaturated alkoxylated alcohol contain various amounts of ethylene oxide, propylene oxide and butylene oxides elected to optimize their interfacial properties with different types of crude oil with different brines.