Single-Mode Fiber Couplers provide sub-micron positioning resolution for coupling laser light into single-mode fibers. Single-Mode Fiber. Thorlabs offers a varied selection of single mode (SM), polarization-maintaining (PM), multimode (MM), and double-clad fiber couplers, as well as 1x8 and 1x16 SM PLC splitters; 1x4, 1x8, and 1x16 PM PLC splitters; wideband multimode circulators; RGB combiners; and WDMs. Accurate coupling ratio's from 50/50 to 1/99 are available with very tight uniformity. They are very reliable and inexpensive. 5 mm²) these components fulfill the highest requirements regarding thermal and physical stability. | Wavelength Combiner (WDM) - Fused coupler for wavelength combining / splitting. Optimum performance and operation under adverse environ-mental conditions are achieved through licensed use of fused biconical taper cou-pler patents, with proprietary refinements combined with rigorous.