Low loss coupling to sub-micron thick rib and nanowire waveguides by vertical tapering
2013; Optica Publishing Group; Volume: 21; Issue: 3 Linguagem: Inglês
10.1364/oe.21.003582
ISSN1094-4087
AutoresSteve Madden, Zilong Jin, Dongseok Choi, Swapan Debbarma, Douglas Bulla, Barry Luther‐Davies,
Tópico(s)Advanced Fiber Laser Technologies
ResumoHighly nonlinear planar glass waveguides have been shown to be useful for all optical signal processing. However, the typical SMF-28 fiber to waveguide coupling loss of ~5dB/end remains a barrier to practical implementation. Low loss coupling to a fiber using vertical tapering of the waveguide film is analyzed for rib and nanowire waveguides and experimentally demonstrated for ribs showing polarization and wavelength independence over >300nm bandwidth. Tapers with essentially zero excess loss led to total losses from the waveguide to fiber core of 1.1dB per facet comprising only material absorption (0.75dB) and mode overlap loss (0.36dB), both of which can be eliminated with improvements to processing and materials.
Referência(s)