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Optical Notch Filter PIC Using Cascaded Gratings
Tool Used: OptSim Circuit
This application is based on the Reference [1]. Two identical reflective Bragg gratings are separated by a narrow gap as shown in Fig. 1.
The layout uses phase modulating component in the ring resonator structure as shown in Fig. 1.
Figure 1: Schematic layout of two reflective gratings
The filter with above arrangement will result in a narrow resonance due to reflections from both gratings. Traditional modeling tools for the fiber optic systems where signals are unidirectional won¡¯t be able to model this phenomenon. On the other hand, OptSim Circuit is ideally suited for this type of modeling.
The OptSim Circuit layout for the PIC of Fig. 1 is shown in Fig. 2 below.
Figure 2: OptSim Circuit layout of two reflective gratings schematic of Fig. 1
Figures 3 and 4 show transmission and reflection spectra respectively.
Figure 3: Transmission spectra due to the coherent combination of two reflecting Bragg gratings
Figure 4: Reflection spectra due to the coherent combination of two reflecting Bragg gratings
References:
1 J. Lumeau, V. Smirnov, and L. B. Glebov, "Phase-shifted volume Bragg gratings in photo-thermo-refractive glass," Optical Components and Materials V, Proceedings of SPIE, vol. 6890, 2008.