Brendan Roycroft

TL;DR: In this paper, a sequence of partially reflective slots etched into an active ridge waveguide of a 1.5 mum laser structure is found to provide sufficient reflection for lasing, and two such active mirrors together with an active central section are combined in a Vernier configuration to demonstrate a tunable laser exhibiting 11 discrete modes over a 30 nm tuning range with mode spacing around 400 GHz and side-mode suppression ratio larger than 30 dB.

TL;DR: In this article, a two-section diode with different slot patterns in each section allowing Vernier tuning was proposed and demonstrated, achieving a discontinuous tuning range of 30 nm with a side mode suppression greater than 30 dB.

TL;DR: In this paper, a set of guidelines for the practical design of lensed fiber for the optical coupling of semiconductor lasers in butterfly packages using laser welding is proposed, which optimized the tradeoff between coupling efficiency and alignment tolerance.

TL;DR: In this article, a comparison between waveguide and surface normal photodiodes with the latter showing good sensitivity up to 15 Gb/s was made and a strong electro-optic effect using the quantum confined Stark effect in strain-balanced multiple quantum wells was demonstrated and used in a Mach-Zehnder modulator capable of operating at 10 Gb /s.