Performance of an add-drop ring resonator for photonic applications


    Pablo Sanchis Kilders


The add-drop ring resonator is a device based on a ring resonator coupled to two optical waveguides. At the ring resonance, the input light is mainly coupled to the drop port and attenuated at the through port. On the contrary, out of the ring resonance the input light will mainly go into the through port and attenuated at the drop port.


- Analyze the influence of the transmission coefficients in the through and drop ports.
- Analyze the influence of losses in the ring resonator.
- Optimize the device performance depending on the target application.


The normalized optical power at the through and drop ports is simulated as a function of the single-pass phase shift in the ring. The responses will depend on the amplitude transmission coefficients in the through and drop ports (tth and tdp) and the amplitude loss coefficient of the ring resonator (A). The loss coefficient is in linear units so that A=1 corresponds to the lossless case and A=0 to the infinite loss case. The normalized optical power can be shown in dB (plotdB=1) or linear (plotdB=0) units. The insertion losses (IL) and extinction ratio (ER) at both output ports is also shown when plotting the results in dB units.


Transmission coefficient in through port

Transmission coefficient in drop port

Ring losses

Plot units


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