New structural design of passive optical array waveguide grating-wavelength division multiplexing to upgrade the multiplexing/demultiplexing characteristic

作者：Vanani Ali Salehi^*; Ghayour Rahim

来源：Optical Engineering, 2011, 50(10): 105004.

DOI：10.1117/1.3638067

• array waveguide grating
• wavelength division multiplexing
• Rowland circle
• taper
• dense wavelength division multiplexing

In this paper an 8x1 array waveguide grating-wavelength division multiplexing (AWG-WDM) is optimized for its applications in WDM networks, with the wavelength selective switch as the multiplexer/demultiplexer. With the new method of optimization proposed in this work, a higher bandwidth and lower crosstalk and insertion loss are achieved. The procedure of optimization for finding the best parameters such as the waveguide separation at the output circle, a new structure for Rowland circle, a new structure for the tapered waveguide, and displacement of the foci of the Rowland circle from its standard construction are presented and the results are discussed. We designed a silica-based 8 channel AWG-WDM with the channel spacing of 1.6 nm and the central wavelength of 1550 nm. The occupied area of the phased arrayed waveguides is 2.2 x 1.3 cm(2), and the total device size is 3.6 x 1.28 cm(2). The 3dB bandwidth of AWG-WDM is 3.31 x 10(-4) mu m. The insertion loss of the side channels (1 or 8) is about 2.65 dB for this design, where it is about 3.77 dB for the device based on the standard Rowland circle structure.

• 出版日期2011-10