High-quality pulse compressor for WDM/OTDM applications

The paper reports the results of a high-quality pulse source incorporating a gain-switched laser diode followed by a novel compact two-cascade fibre compression scheme. The pulse compression scheme incorporates a dispersive delay line and a nonlinear pulse compressor based on a dispersion-imbalanced fibre loop mirror (DILM). We analyse and demonstrate for the first time significant improvement of the loop performance by means of the chirped pulse switching. As a result, the DILM provides high-quality nonlinear pulse compression as well as rejection of the nonsoliton component. In the experiment, 20ps pulses from a gain switched laser diode are compressed to a duration of 300fs at a repetition rate in range 70MHz-10GHz. The pulses are pedestal free and transform-limited. Spectral filtering of the output signal by means of a bandpass filter results in generation of wavelength-tuneable picosecond pulses with a duration defined by the filter bandwidth. Alternatively, signal filtering by an arrayed waveguide grating (AWG) results in multichannel picosecond pulse generation for WDM and OTDM applications. The pulse source is built of standard components and is of compact and potentially robust design.

Compact three-dimensional silicon termination solutions for high voltage SOI SuperJunction

This paper demonstrates and discusses novel "three dimensional" silicon based junction isolation/termination solutions suitable for high density ultra-low-resistance Lateral Super-Junction structures. The proposed designs are both compact and effective in safely distributing the electrostatic potential away from the active device area. The designs are based on the utilization of existing layers in the device fabrication line, hence resulting in no extra complexity or cost increase. The study/demonstration is done through extensive experimental measurements and numerical simulations. © 2012 IEEE.