Modules including multiple rows of adapters for high density optical fiber distribution frame

A fiber optic telecommunications frame is provided including termination modules positioned on left and right sides of the frame. The frame further includes left and right vertical cable guides. The frame includes a horizontal passage linking the left and right panels and the cable guides. The termination modules hold fiber optic modules with front termination locations. The fiber optic modules can house couplers, such as splitters, combiners, and wave length division multiplexers. A retention mechanism retains each fiber optic module in a partially removed position from the termination module. An adapter retainer may be removably mounted within an open front of the fiber optic modules, and a fiber optic module may include a plurality of rows of adapters.