Silica-based planar lightwave circuits on silicon (Si) substrates have become important in optical communication systems . The planar ring resonator, which has been used in frequency-stabilized light sources, is one such device. Recently, a finesse-variable ring resonator was reported . This was realized by integrating a Mach-Zehnder waveguide coupler whose coupling ratio was tunable. However, the finesse is limited because the propagation loss in the resonator can not be compensated for with the device.
© 1993 Optical Society of AmericaPDF Article
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