VMUX (Variable Optical Attenuator Multiplexer) is used in DWDM systems and Reconfigurable Optical Add/drop Multiplexer (ROADM) systems. VMUX modules are composed of AWG devices and PLC-VOA Arrays, which can achieve pre-equalize of optical power in 40~60 channels individually. Featuring small size, low cost, low power dissipation, high integration, and high reliability.