Hybrid silicon ring lasers

Hybrid silicon platform provides a solution to integrate active components (lasers, amplifiers, photodetectors, etc.) with passive ones on the same silicon substrate, which can be used for building an optical interconnect system. Owing to the advantages in footprint, power consumption, and high-speed modulation, hybrid silicon microring lasers have been demonstrated as a potential candidate for on-chip silicon light source. In this paper we review the progress to improve the performance of recently demonstrated compact microring lasers with ring diameter of 50 μm. A simple approach to enhance optical mode and electron-hole recombination, which results in threshold reduction and efficiency improvement is developed. This is done by appropriately undercutting the multiple quantum well (MQW) region to force carriers to flow towards the outer edge of the microring for better gain/optical mode overlap. We observe a reduction of the threshold of over 20% and up to 80% output power enhancement. The model and the experimental results highlight the benefits, as well as the negative effects from excessive undercutting, including lower MQW confinement, higher modal loss and higher thermal impedance. A design rule for MQW undercutting is therefore provided. Application as on-chip optical interconnects is discussed from a system perspective.

[1]  M. Smit,et al.  A fast low-power optical memory based on coupled micro-ring lasers , 2004, Nature.

[2]  T. Krauss,et al.  An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers , 2002 .

[3]  J. Bowers,et al.  Experimental and theoretical thermal analysis of a Hybrid Silicon Evanescent Laser. , 2007, Optics express.

[4]  Charlotte R. Bennett,et al.  Demonstration of multi-core photonic crystal fibre in an optical interconnect , 2006 .

[5]  Qianfan Xu,et al.  Silicon microring resonators with 1.5-microm radius. , 2008, Optics express.

[6]  L. Di Cioccio,et al.  A Compact SOI-Integrated Multiwavelength Laser Source Based on Cascaded InP Microdisks , 2008, IEEE Photonics Technology Letters.

[7]  Qianfan Xu,et al.  Micrometre-scale silicon electro-optic modulator , 2005, Nature.

[8]  H. Haus,et al.  Microring resonator channel dropping filters , 1997 .

[9]  W. Marsden.  I and J , 2012 .

[10]  L. Kimerling,et al.  Effect of size and roughness on light transmission in a Si/SiO2 waveguide: Experiments and model , 2000 .

[11]  Nicolas Volet,et al.  Turn-on delay and Auger recombination in long-wavelength vertical-cavity surface-emitting lasers , 2010, Photonics Europe.

[12]  F. Xia,et al.  Ultracompact optical buffers on a silicon chip , 2007 .

[13]  Di Liang,et al.  Electrically-pumped compact hybrid silicon microring lasers for optical interconnects. , 2009, Optics express.

[14]  L. Coldren,et al.  Diode Lasers and Photonic Integrated Circuits , 1995 .

[15]  R Baets,et al.  Electrically pumped InP-based microdisk lasers integrated with a nanophotonic silicon-on-insulator waveguide circuit. , 2007, Optics express.