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Integrated optical systems offer high component density in a compact, stable and robust platform. However, there are many situations in which it is useful to transition from an integrated waveguide to an optical fiber, such as long distance transmission. The loss associated with coupling between the two platforms can be critical in applications such as quantum information processing (QIP).
We propose a simple method based on the spectrum analysis of transmission through an unbalanced Mach-Zehnder interferometer to characterize waveguide propagation loss and 2×2 waveguide coupler's coupling coefficient simultaneously. We show it is possible to determine the propagation loss and the coupling of each coupler.
Goal of the presented work is the development of an optical bus-coupler, which enables easy connection between two waveguides without interrupting the bus. It is possible to realize optical bus systems by connecting several modules onto one waveguide with a core-core-coupler. In this paper we present the concept of a bus-coupler, which is suitable for a bidirectional coupling with a definable ratio...
We represent the polarization dependent loss of graphene placed directly onto silicon waveguides. Graphene introduces 7.7 dB higher losses for TM mode in a 150 µm long waveguide, which is sufficient for an integrated polarizer.
We demonstrate low-loss fiber-to-chip coupling using 7.3 μm long silicon strip waveguide cantilever couplers. Average coupling losses are measured to be less than 0.62 dB per connection throughout the optical telecommunications C band.
A dual core spot size converter was developed for reducing a coupling loss between an optical fiber and a III–V compound semiconductor optical waveguide. It can be fabricated without a crystal regrowth process.
We report a suspended-core chalcogenide fiber with a record Kerr nonlinearity of 31 300 W-1 km-1 and an attenuation of 4.6 dB/m. The dispersion, the effective area and the number of modes propagating in the fiber are investigated.
A novel technique to suppress the higher-order mode in a bent large-mode-area triple-cladding fiber is experimentally presented. 3-dB suppression of LP02 mode is observed on a fabricated triple-cladding fiber with 130-mm diameter bend.
Square lattice with much higher node-to-strut ratio is promising for significantly extending bandgaps in hollow-core fibres. First such fibres are achieved here. Minimum loss of 67dB/km is demonstrated along with potential for much extended bandgaps.
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