The TSI Model FBL-2 fiberlight™ Multicolor Beam Generator provides high power handling capacity in a compact easy-to-align package. It needs no vertical or horizontal alignment in the beam path. Frequency shift is built in, and all three beam pairs are available on all fiberlight models. This simplifies the expansion path, and makes the system easy to upgrade, all the way to a three-component phase Doppler system.

Four fiberoptic couplers are included with the FBL-2. These represent over ten years of refinement and offer reliable fiber coupling, with easier optimization even after a fiber is removed from the coupler.