This paper reports recent advances on arrayed waveguide grating (AWG) multi/demultiplexers based on silica-based
planar lightwave circuits (PLC). After briefly summarizing the fabrication and properties of PLCs, this work describes a
Mach-Zehnder interferometer (MZI)-synchronized AWG with reagrd to reduced loss, and athermalization. The paper
then reports our recent demonstration of the integration of a PLC-based wavelength selective switch (WSS) and an
integrated single-chip VMUX/DEMUX.
We have developed a 2 by 2 digital optical switch (DOS) composed of four 1 by 2 DOS elements and a thermo-optic wavelength tunable filter using silicone resin waveguides. The 2 by 2 DOS operated with a switching power of 380 mW, a very low crosstalk of less than -60 dB, and a low insertion loss of less than 2.5 dB at 1.55 micrometers . The tunable filter operated with a maximum power of 2.5 W, a tuning range of > 30 nm, a crosstalk of < -30 dB, and response time of < 60 ms. We also applied our polymer tunable filter to a WDM/SCM LAN system to confirm its practicality.
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