| Abbreviation | Definition |
|---|---|
| OEU | Oregon Electric Utility |
| OF | Optical Fiber |
| OFAN | Optical Fiber Access Network |
| OFB | Output FeedBack |
| OFC | Optical Fiber Cable |
| OFC | Optical Fiber Communications |
| OFC | Oxygen Free Cable |
| OFDA | Optical Fiber Diameter Analyzer |
| OFE | Oxygen Free Electronic |
| OFHC | Oxygen-Free High-Conductivity (copper) |
| OFI | Optical Fiber Identifier |
| OFI | Optical Fiber Installation |
| OFIT | Optical Fiber Installation Tester |
| OFS | Optical Fiber Sensor |
| OFS | Optical Fiber System |
| OGE | Oklahoma Gas and Electric |
| OHTL | Overhead Transmission Line |
| OI | Opto Isolator |
| OID | Object IDentification |
| OIM | Orientational Imaging Microscopy |