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Planar waveguide WDM technology: from components to systems

Recent explosive growth of Internet traffic greatly accelerates the needs of telecommunication and networking bandwidth. To satisfy this rapid increase in demand of bandwidth, WDM is the technology of choice. To implement an advanced WDM system, there are needs of various high performance and high complexity photonic devices: multiple wavelength laser arrays, wavelength multiplexer and/or demultiplexer, wavelength router/switches, wavelength add-drop switch, etc. Spectrometer on a chip (SOC) is one of the key enabling technologies to meet those needs. In this paper we review the advancement of planar waveguide WDM technology—from SOC components to integrated SOC WDM systems.