We propose a CO2-laser writing technique for the fabrication of long-period waveguide gratings on polymer waveguides. This technique is based on introducing corrugation on the waveguide surface and a refractive-index modulation in the waveguide material by scanning a beam of CO2-laser pulses along the waveguide. We demonstrate this technique by writing gratings on epoxy-clad benzocyclobutene channel waveguides. The rejection band of a typical fabricated grating has a contrast of ~12 dB and a 3-dB bandwidth of ~15 nm at the wavelength 1568 nm, which is the result of coupling from the core mode to the first cladding mode on the second diffraction order.
CO2-Laser Writing of Polymer Long-Period Waveguide Gratings
2008-12-01
473233 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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