Approved Optics E1MG-LX-A is a single-mode transceiver - a small form factor pluggable module for bi-directional serial optical data communications such as Gigabit Ethernet 1000BASE-LX and Fiber Channel 1x SM-LX-L FC-Pl. This module is designed for single-mode fiber and operates at a nominal wavelength of 1310nm.

The transmitter section uses a multiple quantum well laser and is a class 1 laser compliant, according to International Safety Standard IEC-60825. The receiver section uses an integrated GaAs detector preamplifier (IDP) mounted in an optical header and a limiting post-amplifier IC.