Peter A. Andrekson

High-power single-element pseudomorphic InGaAs/GaAs/AlGaAs single-quantum-well lasers for pumping Er-doped fiber amplifiers

A 980 nm ridge waveguide pseudomorphic InGaAs/GaAs/AlGaAs single quantum well laser with a maximum single-ended output power of 240 mW from a facet coated device has been fabricated from a graded index separate confinement heterostructure grown by molecular beam epitaxy. The laser oscillates in the fundamental spatial mode, allowing 22% coupling efficiency into a 1.55 micrometers single-mode optical fiber. Life testing at an output power of 30 mW per facet from uncoated devices reveals a superior reliability to GaAs/AlGaAs quantum well lasers but also the need for protective facet coatings for long term reliability at power levels required for pumping Er-doped fiber amplifiers.

Single-wavelength 40 Gb/s soliton field transmission experiments over 400 km fibre without in-line control

We report single-wavelength 40-Gbit/s soliton transmission over 400-km installed fiber lines in Sweden. Both polarization-division multiplexed and parallel solitons were transmitted. The system performance is dominated by the polarization-mode dispersion.