Abstract
An overview of microring resonator architectures, fabricated using both fiber and integrated technologies, whose function is to reflect nearly the entire incident signal within a specified band of frequencies, is presented. The signal components that lie outside this band, called the stopband, are either transmitted through the device to exit through another port, or dissipated. The stopband reflectivity is ideally close to unity, while outside the stopband the reflectivity is very small; the device performs the function of a band-limited optical mirror. A primary application for such a mirror is in semiconductor laser devices, where its frequency selective properties are exploited to eliminate unwanted resonances of an active medium with a broad gain characteristics. Another application involves the mirror group delay characteristics in reflection, which can, in some architectures, be shaped to compensate for the group delay distortion of an incident signal, or control the Q factor of an oscillator. Comparisons of the reflection coefficient provided by various architectures in terms of resonator loss and as a function of the coupling strength to the input waveguide are included.
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Acknowledgments
Ioannis Chremmos acknowledges the support of the Alexander Onassis Public Benefit Foundation. Otto Schwelb acknowledges the support of the Natural Sciences and Engineering Research Council of Canada.
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Schwelb, O., Chremmos, I. (2010). Band-Limited Microresonator Reflectors and Mirror Structures. In: Chremmos, I., Schwelb, O., Uzunoglu, N. (eds) Photonic Microresonator Research and Applications. Springer Series in Optical Sciences, vol 156. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-1744-7_6
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