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