Asymmetrical optical interleaving with different bandwidth ratios based on MGTI structure

The asymmetrical optical interleaver which is investigated is a modified Michelson interferometer (MI) that both of their reflecting mirrors are replaced by two mirror Gires-Tournois etalons (GTEs). Four simulated groups of spectrums are obtained by choosing appropriate value of structure parameters such as GTE front surface mirror reflectance, the cavity length of GTE and interferometer arm length difference. Every simulation result has high channel isolation, wide flat-top passband and different periods. The ratio of output port (wide bandwidth) to another output port (narrow bandwidth) at 3dB passband (bandwidth ratio) is respectively 1.69, 1.83, 2.13 and 2.14. The effects of these structure parameters upon output spectrums are systematically investigated. Numerical simulation results prove that asymmetrical interleavers of different bandwidth ratios could be obtained by using this MGTI. Flat-top characteristics of output spectrums such as passband bandwidth and channel isolation are influenced by GTE front surface mirror reflectance. The reflectance has different effects on them. Different frequency periods can be obtained by choosing appropriate GTE cavity length and interferometer arm length difference.