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I am confused by this edit, where the edit summary claims that optical activity "does not exemplify non-reciprocal optics". Is optical activity not non-reciprocal? I would think that it would be. A fuller explanation would be appreciated.--Srleffler (talk) 03:37, 5 October 2009 (UTC)[reply]
Although most commonly available in fiber, optical circulators could be free-space, or chip-based. I hope to improve the article to reflect this sometime later, but if another editor could already start working on this, it would be great! Quantumavik (talk) 02:16, 21 December 2017 (UTC)[reply]