HYC provides WDM(Wavelength Division Multiplexer) with high isolation up to 50dB or ultra-low insertion loss as low as 0.25dB to meet special applications. Reflective WDM adopts reflected type structure, with all port's fiber on one side of the body, which can maximum reduce fiber coiling space. The size of the reflective type WDM can be almost half of the normal device, but the function and performance are the same as the regular WDM.