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Long-term frequency stability of three absolutely referenced lasers at 1547.8 nm located at different places which were separated by 30 Km

 

Shevy, Y. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Laser Frequency Stabilization and Noise Reduction 1995 : 9 - 10 February 1995, San Jose, California
Bellingham/Wash.: SPIE, 1995 (SPIE Proceedings Series 2378)
ISBN: 0-8194-1725-4
pp.206-211
Conference "Laser Frequency Stabilization and Noise Reduction" <1995, San Jose/Calif.>
English
Conference Paper
Fraunhofer HHI ()
frequency measurement; laser frequency stability; measurement standards; optical communication equipment; long-term frequency stability; optical communication; absolutely referenced lasers; relative optical frequency stabilities; optical reference units; heterodyned; 1547.8 nm; 30 km

Abstract
The relative optical frequency stabilities of three optical reference units at 1547.82 nm were examined. The reference units were located at different places in Berlin and connected via several kilometres of optical fibre. The three optical signals were heterodyned to measure the frequency stabilities, which were better than 2*10-11 (2.5 KHz).

: http://publica.fraunhofer.de/documents/N-13389.html