The Polarization Maintaining Fused Wavelength Division Multiplexer is combine or separate light at different wavelengths. It charaterized with very low insertion loss, high extinction ratio and excellent environmental stability. This product can also be used to multiplex other wavelengths. including 980/1030 nm (pulsed laser applications) and 1064/1550 nm (Erbium-Ytterbium pumping). Low power (300 mW, 500 mW) and high power (20W) handling are available.They are ideal for polarization maintaining fiber amplifiers, fiber lasers, and high speed communication system and instrumentation applications.