Abstract: A fiber optics wavelength add/drop module and wavelength division multiplexer is presented based on multi-fiber collimators. In one embodiment, the device has a total of six input/output fibers to resemble a dual three-port add/drop devices configuration. In another embodiment, the devices are cascaded to make an integrated multiplexer/demultiplexer module. In another embodiment, the output fibers are connected by special fibers to produce a miniature bend to form a compact device. The configuration can raduce the number of components by at least a factor of two, thus reducing the cost and size, and enhancing the reliability.