Abstract: In an optical coupler for dividing or combining lights of different wavelengths, at least one wavelength separating filter connector terminal is provided at least one light input and output terminals. The wavelength separating filter connector comprises first and second optical fibers which are in contact with each other by placing an optical wavelength separating filter film between the first and second optical fibers, so that an isolation is large between separated lights.

Abstract: An optical fiber connector for connecting an optical fiber plug with an adapter wherein said plug has one or more ferrules for receiving one or more optical fibers each ferrule having an associated spring disposed coaxial with an outer periphery therewith, and a slip-out prevention member fixed to each ferrule to retain the spring in position. A first housing member receives said one or more ferrules, spring members and slip-out prevention members. A second housing accommodates the first housing and is slidably disposable therewith. The plug engages an adapter and is secured thereto by sliding the second housing member relative to the first housing member.