We study the optical performances of microring resonator modulators fabricated on 200 mm SOI wafers to select the ring resonator modulators for targeted ONoC and optical interposer applications. Counter-doped ring resonator modulators were fabricated to guarantee the absence of unexpected p-i-n junctions in the ring waveguide due to overlay misalignments inherent to successive fabrication steps. The fabricated add-drop ring resonator modulators showed good DC performances with a VπL at 1.55 V.cm. Finally, ultra-low loss waveguides were realized to allow long distance data transport on photonic chips.
When increasing channel bit rate beyond 10Gb/s or when operating over fiber lines with sparse or no in-line dispersion
compensation, Kerr-like non-linear effects can be considered as second order with respect to dispersive effects, because
pulse broadening can expand over numerous neighbor pulses, before optical non-linear effects imprint their signature
noticeably. To accurately emulate the interactions between pulses in this case, a few studies emphasized that Pseudo-
Random Binary Sequences (PRBS) should be used, with exponential dependence of the required PRBS length on bit rate
and accumulated dispersion. In this paper, we explain our strategy to numerically estimate the required number of
random, noisy bits for Monte-Carlo simulations, and show that it weakly increases in presence of pulse to pulse
correlations and commonly tolerated levels of non-linearities (i.e. leading to transmission penalties as high as 1.5dB, for
reference BERs of 10<sup>-2</sup>, 10<sup>-3</sup> or 10<sup>-5</sup>) . Then we determine the actual required PRBS length that yields the same
(sufficient) BER accuracy as the MC method. We demonstrate its actual dependence on BER, and show that MC theory
provides a reliable upper bound in FEC-assisted, highly dispersive systems.
A new concept of optical fiber dynamic strain sensor has been theoretically studied and its proof-of-the-principle
experimentally demonstrated. It is based on two wave mixing by gain saturation in an optically pumped erbium
doped optical fiber. The main feature of this sensor is insensitivity to slow varying perturbations, which is of
major interest for underwater acoustic applications for instance.