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Fabrication of an integrated optical filter using a large-core multimode waveguide vertically coupled to a single-mode waveguide

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Abstract

We demonstrate the feasibility of the process for fabricating a single-mode waveguide and a large-core multimode waveguide aligned vertically on the same substrate. Using this process, we propose and demonstrate a filter that drops optical signal propagating in a single-mode waveguide to a multimode waveguide in the specific wavelength interval by a long-period grating. We use perfluorocyclobutane and benzocyclobutane for the cladding and core of the single-mode waveguide, respectively. The large core of the multimode waveguide is made of Norland Optical Adhesive 61. For the grating period of 315.9 µm, the fabricated filter has the center wavelength of 1537.7 nm, at which the maximum attenuation is 17.8 dB.

©2003 Optical Society of America

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Figures (5)

Fig. 1.
Fig. 1. Schematic view of a gain-flattening filter in the form of an integrated optical device
Fig. 2.
Fig. 2. Schematic view of the fabricated filter (a) 3-dimensional view, and (b) Its cross-section
Fig. 3.
Fig. 3. Fabrication of the multimode waveguide aligned to the single-mode waveguide with the PDMS mode (a) Alignment of the PDMS mold with the aligning marks, and (b) Filling the channels with the prepolymer by capillarity
Fig. 4.
Fig. 4. Microscope picture of the cleaved facet of the fabricated filter
Fig. 5.
Fig. 5. The filter response measured with the ASE noise as a light source when the grating-interaction length is (a) 11 mm, and (b) 16 mm

Equations (2)

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N MMW N SMW = m λ 0 Λ
0.8 Λ L [ 1 Λ ( d N MMW d λ d N SMW d λ ) λ = λ 0 ] 1 λ 0 ,
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