The SPS-53120G series single mode transceivers is small form factor pluggable module for bi-directional serial optical data communications such as SONET OC-12 / SDH STM-4 and Fiber Channel. It is with the SFP 20-pin connector to allow hot plug capability. This module is designed for single mode fiber and operates at a nominal wavelength of 1550 nm. A guaranteed minimum optical link budget of 34 dB is offered which can correspond to a link distance of over 120 km (assuming worst case fiber loss of 0.25 dB/km). The transmitter section uses a multiple quantum well 1550 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.