T&S CWDM optical demultiplexer has 4 wavelength channels at the output. It is built using silica on silicon planar lightwave circuit (PLC) technology. Its single-chip construction is highly reliable and stable, together with its compact size, it can significantly simplify the transceiver assembly and provide a cost-effective solution for many applications. Applicable to QSFP+, QSFP28 and QSFP-DD transceivers using CWDM optical lane