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Very low insertion loss arrayed-waveguide grating with vertically tapered waveguides

2000; Institute of Electrical and Electronics Engineers; Volume: 12; Issue: 9 Linguagem: Inglês

10.1109/68.874228

1941-0174

A. Sugita, A. Kaneko, Katsunari Okamoto, Mikitaka Itoh, A. Himeno, Y. Ohmori,

Optical Coatings and Gratings

We propose and demonstrate a very low insertion loss silica-based arrayed-waveguide grating (AWG) achieved using a novel structure, which has vertically tapered waveguides between arrayed-waveguides to reduce the slab-to-arrayed-waveguide transition loss. A spot-size converter is also incorporated in the AWG to reduce the fiber-to-waveguide coupling loss. The structure can be formed by a process involving the conventional photolithography and reactive ion etching. The structure provided a loss reduction of 1.5 dB. Moreover, we have successfully obtained a minimum insertion loss of 0.75 dB with a crosstalk of -40 dB and polarization-independent operation.