Applications of cyclotron based ion scattering

Ion scattering expts. were performed with a 3-30 MeV AVF cyclotron. The wide range of available energies combined with proper beam handling allows many scattering techniques to be performed. At 1st an example of ordinary Rutherford backscattering spectrometry will be demonstrated on model catalysts as studied in surface chem. High energy backscattering spectrometry with 8.8 MeV He ions, which enhances the sensitivity for O, was applied to study the O removal from corroded archaeol. artifacts upon treatment with a H2 plasma. Elastic recoil detection anal. is shown feasible with He ions having incident energies between 10 and 15 MeV once combined with a thin film detector. The development of a setup for ion channeling expts. with the cyclotron is reported and 1st results promise to increase the angular resoln. in lattice deformation studies. [on SciFinder (R)

A single etch-step fabrication-tolerant polarization splitter

A tolerant single etch-step passive polarization splitter on InP/InGaAsP is designed and fabricated. The device consists of a directional coupler with a wide and a narrow waveguide. Modal birefringence of the third-order modes for transverse electric (TE) and transverse magnetic (TM) polarizations is employed to selectively couple one polarization. Tapering is applied to increase the tolerances. The devices are characterized, and the measurement results show good agreement with the beam-propagation-method simulations: a splitting ratio larger than 95% for a width range of around 100 nm and over a large wavelength range, covering at least the C-ban

Digitized radio-over-fiber transceivers for SDM/WDM back-/front-haul

\u3cp\u3eIn this paper we analyze the perspective of digitized radio over fiber (DRoF) fronthaul, showing how to meet the requirements to cope with the future radio access networks (RANs). This entails the introduction of space division multiplexing (SDM) while increasing the flexibility and capacity of the DRoF transceivers.Since the evolution of the DRoF fronthaul is being revised and re-defined, in the blueSPACE project we propose two different DRoF transceiver options. The first option consists on simple transceiver, based on the recent standard specifications and, therefore, expected to be deployed in the short-term. The second options is a more advanced transceiver that features high flexibility, relying on a strong DSP and targeting a long-term deployment. Besides a basic characterization of both solutions, we also analyze additional aspects related to the design and implementation of these two DRoF solutions and their integration into an SDM based RAN. This includes the programmability and interaction with the control plane.\u3c/p\u3