München 2004 – scientific programme
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Q: Quantenoptik und Photonik
Q 33: Poster Pr
äzisionsmessungen und optische Messtechnik
Q 33.6: Poster
Thursday, March 25, 2004, 14:00–16:00, Schellingstr. 3
Long-distance transmission of optical frequencies using a commercial optical fibre network — •Gesine Grosche1, Michael Eggert1, David Humphreys2, Colin Campbell2, Jan Petersen3, Jes Henningsen3, and Bjarne Skipper4 — 1Physikalische-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig — 2National Physical Laboratory, Teddington, Middlesex, TW11 0LW, UK — 3Danish Institute of Fundamental Metrology, DK 2800 Lyngby, DK — 4NSCB, TDC Solutions, Teglholmsgade 1, DK0900 Copenhagen C, DK
We report experiments transmitting stable optical frequencies, or wavelength references, over 534 km using a commercial optical fibre network carrying live traffic. Wavelength references for optical telecommunications near 1550 nm were transmitted over a fibre link, which is part of a 16-channel dense-wavelength-division-multiplexing network with 200 GHz channel spacing. Optical frequency information was transmitted over 534 km with optical amplification, on a channel positioned between two data-transmitting channels.
For passive references, such as a fiber Bragg grating, we observed additional noise due to amplified spontaneous emission of the cascaded network amplifiers. For active references, such as a stabilized fibre laser, we monitored the wavelength and performed self-heterodyne beat measurements to detect frequency shifts and fluctuations. No frequency shifts or fluctuations exceeding the instability of the reference source (1 MHz) were detected.