1. Product Title 2CH MWDM Polarization Maintaining Module – 1301/1311 nm PM Wavelength Combiner 2. Product Overview GracyFiber 2CH MWDM Polarization Maintaining (PM) Module is a compact passive optical wavelength combining component designed for polarization-sensitive optical systems. The module combines two MWDM channels centered around 1301 nm and 1311 nm using polarization-maintaining fiber and provides stable wavelength routing performance in a compact module package. 3.