Femtosecond optical frequency comb-based tandem interferometer Dong Wei, Satoru Takahashi, Kiyoshi Takamasu and Hirokazu Matsumoto J. Eur. Opt. Soc.-Rapid Publ., 4 (2009) 09043 Published online: 11 September 2009 DOI: 10.2971/jeos.2009.09043