Different Fiber Pigtailed Laser Diode sources are available, operating at different IR wavelengths and power levels. Fiber Pigtailed Laser Diodes (FPLD) with demonstrated long term reliability and high level technical performances are sourced from world leading manufacturers and provided with Fiber to Fiber Coupler (FFC) to efficiently couple the power laser beam into the user (output) fiber. FFC design is based on free space lens ensuring a reliable and repeatable delivery of laser power into the user fiber, hence right to the working area. FFC device is suitable to couple laser power into larger than 150um core output fibers.Additionally to the efficient coupling of the power (primary) laser beam, Fiber to Fiber coupler integrates the wavelength combination of a bright red secondary (aiming) beam or Class III B laser diodes with therapeutic function operating at 660nm, coaxially coupled into the user (output) fiber.