The quest for on-chip optical isolators has recently spawned many new isolator structures. However, there has been some confusion about the requirement of nonreciprocity. Here, we review the essential characteristics of an isolator.
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Christopher R. Doerr is working at Acacia Communications Inc.
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Jalas, D., Petrov, A., Eich, M. et al. What is — and what is not — an optical isolator. Nature Photon 7, 579–582 (2013). https://doi.org/10.1038/nphoton.2013.185
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DOI: https://doi.org/10.1038/nphoton.2013.185
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