The POL in-line polarizer consists of a high-ER micro-polarizer in a stainless steel cylinder. The fiber pigtails can be connectorized with various popular connectors. This device offers low insertion loss, low back reflection, and high extinction ratio. A NoTail™ version of the POL, the NPOL, is also available. It has the advantage of eliminating polarization disturbances caused by fiber pigtails.