26dB optical gain in a rib waveguide dye-doped polymer amplifier operating at 625nm

Mark A. Reilly, Miguel Ramon, Claudio Marinelli, Christopher N. Morgan, Marilu Ariu, Ruidong Xia, Richard V. Penty, Ian H. White, Donal D.C. Bradley

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


We demonstrate optical signal amplification in a solid-state dye-doped polymer with a rib waveguide structure. The device consists of a 1μm × 120μm poly(methyl methacrylate) (PMMA) waveguide, doped with 1% by weight Rhodamine 640 dye, spin coated onto a silica substrate. A 625nm pulsed signal and a co-linear 575nm pump are facet coupled into the waveguide and optical amplification of the signal is demonstrated. Depending on the signal intensity, a maximum internal gain in the 21-26dB range at 625nm is achieved using a 1.2cm long waveguide. The device exhibits a promising signal-to-noise ratio in the 9-16dB range and has the potential for tuning in a 40-50nm wavelength window with the same dye, and throughout the visible spectrum using other dyes. The wavelength operating range of this device is also analyzed. We therefore present a compact, easy to fabricate, high gain block suitable for use in conjunction with plastic optical fibers, which have a low-loss window at around 640nm. Since most of the optical amplification takes place in a short region (< 10μm), an even more compact device geometry can be envisaged using a shorter waveguide.
Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Jul 21 2005
Externally publishedYes

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