MMI-coupled ring resonators in GaInAsP-InP

The characteristic response of single and double GaInAsP-InP ring resonator s in the form of race tracks with a radius of 100 and 200 mum are presented , The used multimode interference (MMI) coupler is as short as 150 mum. A c ontrast of 13 dB, a finesse of six, and free spectral ranges of 50 and 100 GHz have been achieved for the single ring resonator, The double ring reson ator has a full-width at half-maximum (FWHM) of 0.25 nm for the throughput port and 0.4 nm for the drop port.