Monitoring of longitudinal-wave velocity and attenuation of SrTiO 3 at low temperatures using picosecond ultrasound spectroscopy

Nagakubo A., Yamamoto A., Tanigaki K., et al. Monitoring of longitudinal-wave velocity and attenuation of SrTiO 3 at low temperatures using picosecond ultrasound spectroscopy. Japanese Journal of Applied Physics, 51(7) PART2, 07GA09 (2012) https://doi.org/10.1143/JJAP.51.07GA09

Two-mode PLC-based mode multi/demultiplexer for mode and wavelength division multiplexed transmission

We proposed a PLC-based mode multi/demultiplexer (MUX/DEMUX) with an asymmetric parallel waveguide for mode division multiplexed (MDM) transmission. The mode MUX/DEMUX including a mode conversion function with an asymmetric parallel waveguide can be realized by matching the effective indices of the LP01 and LP11 modes of two waveguides. We report the design of a mode MUX/DEMUX that can support C-band WDM-MDM transmission. The fabricated mode MUX/DEMUX realized a low insertion loss of less than 1.3 dB and high a mode extinction ratio that exceeded 15 dB. We used the fabricated mode MUX/DEMUX to achieve a successful 2 mode x 4 wavelength x 10 Gbps transmission over a 9 km two-mode fiber with a penalty of less than 1 dB. ©2013 Optical Society of Americ

Theory of Semantic Programming

Available from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

PLC-based LP11 mode rotator for mode-division multiplexing transmission

A PLC-based LP11 mode rotator is proposed. The proposed mode rotator is composed of a waveguide with a trench that provides asymmetry of the waveguide. Numerical simulations show that converting LP11a (LP11b) mode to LP11b (LP11a) mode can be achieved with high conversion efficiency (more than 90%) and little polarization dependence over a wide wavelength range from 1450 nm to 1650 nm. In addition, we fabricate the proposed LP11 mode rotator using silica-based PLC. It is confirmed that the fabricated mode rotator can convert LP11a mode to LP11b mode over a wide wavelength range. (C) 2014 Optical Society of Americ

PLC-Based LP11 Mode Rotator With Curved Trench Structure Devised From Wavefront Matching Method

A compact and low-loss PLC-based mode rotator is proposed. The mode rotator with the curved trench structure is designed based on the wavefront matching method, which is an optimization algorithm based on the beam propagation method. The proposed mode rotator is 45% in size (1 mm) and has lower loss (1/5) compared with the conventional structure that has a straight trench. Furthermore, the proposed mode rotator can achieve low-mode crosstalk