The Pass 1550nm Reflect 1310nm & 1490nm FWDM Filter Wavelength Division Multiplexer is a precision optical component engineered for fiber optic communication systems requiring efficient wavelength management. It passes 1550nm signals with low insertion loss while reflecting 1310nm and 1490nm wavelengths with high isolation, enabling reliable separation of upstream and downstream channels over a single fiber. Utilizing thin-film filter technology and featuring an epoxy-free optical path, this FWDM filter ensures excellent thermal stability, long-term reliability, and high-performance signal routing. It is ideal for applications such as FTTH, PON, and optical monitoring, and supports custom configurations for fiber type, connector, length, and packaging.