Recent progress on silica-based planar lightwave circuit for flexible and transparent photonic networks

Silica waveguide planar lightwave circuit (PLC) technology is very useful for fabricating the compact and high performance optical devices used in transparent and flexible networks. Wavelength multiplexers and optical switches for ROADM and OXC are still being developed to achieve higher performance and they are integrated to provide the compactness required for future applications. New devices for the advanced modulation format can also be made with PLC technology.