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Generation of multiple-pitch gratings in WDM devices by using a single computer-generated phase mask

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3 Author(s)
Seok Ho Song ; Electron. & Telecommun. Res. Inst., Taejon, South Korea ; Ho Hyung Suh ; El-Hang Lee

Use of a single computer-generated phase mask (CGPM) for monolithic fabrication of submicronmeter multiple-pitch gratings is proposed. The CGPM is a computer-generated Fourier hologram generating multiple diffracted beams with equal intensity from a single incident beam. The submicronmeter grating periods differing by as little as a few angstroms are estimated with basis of the multiple diffraction angles. As a result of preliminary experiment, an array of nine gratings has been achieved by using a CGPM with 2-μm minimum feature size. Limit of the CGPM period due to increase in wavelength spacing of WDM devices is also discussed.

Published in:

IEEE Photonics Technology Letters  (Volume:9 ,  Issue: 1 )