Polarization degenerate solid-state cavity quantum electrodynamics

Quantum Matter and Optic

High-efficiency, high-speed VCSELs for optical interconnects

High-efficiency, high-speed, tapered-oxide-apertured vertical-cavity surface-emitting lasers (VCSELs) emitting at 980 nm have been demonstrated. By carefully engineering the tapered oxide aperture, the mode volume can be greatly reduced without adding much optical scattering loss for the device sizes of interest. Consequently, these devices can achieve higher bandwidth at lower current and power dissipation. In addition, the parasitics are reduced by implementing deep oxidation layers and an improved p-doping scheme in the top mirror. Our devices show modulation bandwidth exceeding 20 GHz, a record for 980 nm VCSELs. Moreover, 35 Gb/s operation has been achieved at only 10 mW power dissipation. This corresponds to a data-rate/power-dissipation ratio of 3.5 Gbps/mW. Most importantly, our device structure is compatible with existing manufacturing processes and can be easily manufactured in large volume making them attractive for optical interconnects

Uni-Traveling-Carrier Balanced Photodiode With Tunable MMI Coupler for Optimization of Source Laser RIN Suppression

A balanced uni-traveling-carrier (UTC) waveguide photodiode (PD) has been fabricated and characterized. The balanced PD incorporates a multimode interference (MMI) coupler as a light combiner/splitter with tunability of the output power splitting ratio. The individual UTC-PDs demonstrate a 1 dB compression current of 80.5 mA and a third-order output intercept point of 46.1 dBm at 60 mA, both representing the highest reported for a waveguide PD. The ability to fine tune the output power splitting of the MMI coupler allows for optimization of source laser relative-intensity noise suppression.United States. Defense Advanced Research Projects Agency (PHOR-FRONT program under United States Air Force contract number FA8750-05-C-0265