The TRSL-9140G series single mode transceivers is small form factor, low power, high performance module for bi-directional serial optical data communications such as SONET OC-48 / SDH STM-16, gigabit Ethernet and Fiber channel. This module is designed for single mode fiber and operates at a nominal wavelength of 1310 nm. A guaranteed minimum optical link budget of 26 dB is offered which can correspond to a link distance of over 40 km (assuming worst case fiber loss of 0.45 dB/km). The transmitter section uses a multiple quantum well 1310 nm DFB laser and is a class 1 laser compliant according to International Safety Standard IEC-60825. The receiver section uses an integrated InGaAs Avalanche photodetector preamplifier mounted in an optical header and a limiting post-amplifier IC. A PECL logic interface simplifies interface to external circuitry.