Liu, Fenghai2; Rasmussen, Christian Jørgen2; Pedersen, Rune Johan Skullerud2
1 Department of Photonics Engineering, Technical University of Denmark2 Department of Electromagnetic Systems, Technical University of Denmark
Larger optical penalties than predicted by a Gaussian crosstalk model are found both in our experiments and in the literature when investigating signals including multiple interferometric crosstalk contributions. We attribute this to an imperfect signal extinction ratio. In this letter, simple analytical relations for crosstalk induced power penalties are derived taking the signal extinction ratio into account and excellent agreement with 10-Gb/s experiments is obtained. Both theory and experiment show the importance of the signal extinction ratio in connection with interferometric crosstalk.