These 2x2 Polarization-Maintaining (PM) Fiber Couplers are designed for operation at 2000 nm and are available with a 50:50, 75:25, 90:10, or 99:1 coupling ratio. How measured fiber parameters help to choose the best coupling and collimation optics. A stable measurement setup is fundamental for any successful measurement. A major cause of frustration and error is the need to continuously readjust optomechanical equipment because of continuous instabilities. These specialized devices enable controlled light splitting while preserving polarization states, a critical requirement in numerous. The 2x2 PM Coupler by Thorlabs operates in the spectral range of 530 nm. With a coupling ratio of 99:1 and an extinction ratio of ≥16 dB, it supports a maximum power level of 100 mW (with connectors) to 250 mW (spliced).
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