Ultra-sensitive all-optical sampling at 1.5 μm using waveguide two-photon absorption
Thomsen, Benn C. and Barry, Liam P. and 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
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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.
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