Demonstration of Compact and Low-Loss Athermal Arrayed-Waveguide Grating Module Based on 2.5%-$\Delta$ Silica-Based Waveguides

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We demonstrated a compact and low-loss athermal arrayed-waveguide grating (AWG) module utilizing silica-based planar lightwave circuit (PLC) technology. Spot-size converters based on a vertical ridge-waveguide taper were integrated with a 2.5%-$\Delta$ athermal AWG to reduce the loss at chip-to-fiber interface. Spot-size converters based on a segmented core were formed around resin-filled trenches for athermalization formed in the slab to reduce the diffraction loss at the trenches. A 16-channel athermal AWG module with 100-GHz channel spacing was fabricated. The use of a 2.5%-$\Delta$ athermal chip with a single-side fiber array enabled a compact package of the size of $41.6\times 16.6\times 4.5$ mm3. Athermal characteristics and a small insertion loss of 3.5–3.8 dB were obtained by virtue of low fiber-to-chip coupling loss and athermalization with low excess loss.
2008-10-25