English translation: optical communications component
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Explanation: Google found several hits for "optical communications components"--tons more for "optical communications"--but I notice that some pages like the following soon lapse into "fiber optic" (or F/O) or "optical fiber communications (OFC)".
P.S. 関連is one of those overused Japanese "noise" words that one learns not to take at face value. Another is 形 (except when it means inch).