Which options represent the recognised singlemode fiber standards?

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Multiple Choice

Which options represent the recognised singlemode fiber standards?

Singlemode fibers are designated with the OS prefixes in IEC terminology. The recognized singlemode standards are OS1 and OS2, both typically 9/125 µm fibers used for different deployment environments (OS1 for indoor use and OS2 for outdoor/long‑haul applications). The OM family (OM1–OM5) are multimode fibers, not singlemode. SM1/SM2 are not standard singlemode designations in current practice, and OS3/OS4 are not the commonly referenced singlemode categories. So OS1 OS2 best represent the recognized singlemode fiber standards.

Singlemode fibers are designated with the OS prefixes in IEC terminology. The recognized singlemode standards are OS1 and OS2, both typically 9/125 µm fibers used for different deployment environments (OS1 for indoor use and OS2 for outdoor/long‑haul applications). The OM family (OM1–OM5) are multimode fibers, not singlemode. SM1/SM2 are not standard singlemode designations in current practice, and OS3/OS4 are not the commonly referenced singlemode categories. So OS1 OS2 best represent the recognized singlemode fiber standards.

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