What is: and what is not: an optical isolator
Journal article published in 2013 by
Dirk Jalas,
Alexander Petrov,
Manfred Eich,
Wolfgang Freude,
Sh Fan,
Zf Yu,
Roel Baets,
Milos Popovic,
Andrea Melloni 
,
John D. Joannopoulos,
Mathias Vanwolleghem,
Cr Doerr,
Hagen Renner
,
John D. Joannopoulos,
Mathias Vanwolleghem,
Cr Doerr,
Hagen Renner
This paper is made freely available by the publisher.
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Abstract
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.