Abstract: Each of a pair of members has a mating surface extending from one edge to another. When they are mated together, with optical fibers, they act as a housing. At least one member includes formed grooves on its mating surface, extending from one edge to another thereof. Each groove from one edge of the mating surface to a point medial to the one edge and the other edge is formed to at least partially hold an unjacketed optical fiber therein. Each groove from such point to the other edge is formed to at least partially hold a jacketed optical fiber therein. Each groove in at least one of the members can be uniformly formed from the one edge of the mating surface to the respective point, and can be uniformly formed from the respective point to the other edge of the mating surface. Each groove can change from one uniform formation to a different uniform formation at the respective point.