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Tunable optical filters using compound ring resonators for DWDM

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4 Author(s)
C. Vazquez ; Dept. de Tecnologia Electron., Univ. Carlos III, Madrid, Spain ; S. Vargas ; J. M. S. Pena ; P. Corredera

The device is based on a loop mirror in a ring resonator. The loop mirror allows tuning by changing the coupling coefficient of a directional coupler. The loop mirror is implemented using a Sagnac configuration to have the same optical path between the signals to be interfered (copropagating and counterpropagating ones). The filter structure allows optical integration for having higher free-spectral ranges. Simple design equations for the filter parameters and the tuning are reported. Measurements on a passive optical fiber tunable filter are presented. There is a good agreement between measurements and theory.

Published in:

IEEE Photonics Technology Letters  (Volume:15 ,  Issue: 8 )