The 1 mW triplexer laser module was designed for use in fibre-optical testing devices for which several wavelengths are required. The wavelengths 1310 nm, 1490 nm, and 1550 nm, which can be used simultaneously, are integrated into a small housing and coupled into an SM fibre. The series includes the option of photodiodes for example the triplexer, TRI-L2P1-15.13.IN incorporates lasers with wavelengths of 1550 nm and 1310 nm, as well as an InGaAs PIN PD into a small main-body footprint of 12.50 x 19.05 x 13.70 mm, and coupled with a 9/125 µm single-mode fibre pigtail for easy board mounting. The output power is 0.5 mW. The main advantages of the Triplexer module are its compact, economical by unit cost and cost of system integration.