Ultra-sensitive all-optical sampling at 1.5 μm using waveguide two-photon absorption
Thomsen, Benn C., Barry, Liam P.ORCID: 0000-0001-8366-4790, Dudley, John M. and Harvey, John D.
(1999)
Ultra-sensitive all-optical sampling at 1.5 μm using waveguide two-photon absorption.
Electronics Letters, 35
(17).
pp. 1483-1484.
ISSN 0013-5194
We demonstrate a simple and ultra-sensitive all-optical sampling system suitable for the characterization of high capacity (> 100 Gbit/s) single channel systems operating around 1.5 µm. The system is based on the nonlinear effect of two-photon-absorption in a commercial 1.3 µm semiconductor laser and, using only direct detection of the unamplified two photon absorption photocurrent, we have achieved a temporal resolution of around 2 ps, and a sensitivity of less than 2 mW².