/Modelling of optical feedback in hybrid III-V on Si lasers for optical frequency combs and laser stabilization

Modelling of optical feedback in hybrid III-V on Si lasers for optical frequency combs and laser stabilization

Leuven | More than two weeks ago

Optical frequency combs and low linewidth hybrid lasers for WDM applications

Lasers are ubiquitous in modern technology and their use spans from daily life (e.g. laser printer) to some most complex scientific experiments (such as LIGO), and laser transceivers constitute the backbone of the internet network. The need of integrating the lasers closer to electrical ICs in datacenters to meet the requirement of even more larger bandwidths driven by the surge of increased data traffic has made laser integration one of the highest priorities of the silicon photonics industry. 

As part of increasing data traffic, wavelength division multiplexing (WDM) is one of the workhorse of silicon photonics. Increased data traffic pushes towards dense WDM but is hampered by the maximum of lasers that can be integrated on a silicon PIC. One solution may lie in the use of the nonlinear optical phenomenon called dissipative Kerr solitons (DKS) in a microresonator that can be coupled to on-chip laser. While on-chip lasers are very sensitive to optical feedback, the coupled system enables optical injection locking which stabilizes the laser while generating an optical frequency comb that can meet the needs for DWDM.

This research will focus on modelling the dynamics of a laser diode coupled to high-Q SiN resonator with different focus points:

  • Literature review about optical injection locking and dissipative Kerr solitons in Si/SiN microresonators;
  • Development of models revealing the laser dynamics with optical feedback with scripts to be written in Python;
  • Solving the Lugiato-Lefever equation modelling the dissipative Kerr soliton regime;
  • Study through numerical simulations of the coupled laser-microresonator system in the self-injection locking regime;
  • Definition of guidelines for the design of future devices enabling the generation of optical frequency combs for DWDM applications.

 

Modelling

 

Type of project: Internship

Duration: Min 6 months

Required degree: Master of Science, Master of Engineering Science, Master of Engineering Technology

Required background: Physics, Electrotechnics/Electrical Engineering, Nanoscience & Nanotechnology

Supervising scientist(s): For further information or for application, please contact: Charles Caer (Charles.Caer@imec.be)

Imec allowance will be provided for students studying at a non-Belgian university.