| Optical Access Network | Optical Access Node | Optical Access SONET Interface System | Optical Access Switch | Optical Active Cable |
| Optical Add Drop | Optical Add Drop Multiplexer | Optical add-drop multiplexer | Optical Add/Drop Node | Optical Add/Drop Switch |
| Optical Aircraft Measurements Program | Optical Air Data System | Optical Alignment Facility | Optical Alignment Group | Optical Alignment Transfer System |
| Optical amplification | Optical amplifier | Optical Amplifier | Optical Amplifier Module | Optical Amplifier/Optical Demultiplexer |
| Optical Amplifier Section | Optical Analog Receiver | Optical Analog-to-Digital Converter | Optical and Atm | Optical and Electronic Projection Services |
| Optical and Electro-Optical | Optical and Fiber Communications Reports | Optical and Quantum Electronics | Optical and Radar Federated Earth Observation | Optical and Space Systems Division |
| Optical Angular Motion Sensor | Optical Answer Print | Optical answer sheet | Optical Answer Sheet | Optical Application Router |
| Optical Application-Specific Integrated Circuit | Optical Arbitrary Waveform Generation | Optical Arbitrary Waveform Technology | Optical Array Logic | Optical Associates Inc. |
| Optical Associates Limited Partnership | Optical Attenuation Test Set | Optical Augmentation | Optical Automatic Gain Control | Optical Automatic Library |
| Optical Automation Systems | Optical Axis-to-Target View | Optical Back Scatter | Optical Backscatter Reflectometer | Optical Balanced Receiver |
| Optical Band Pass Filter | Optical Bandwidth Test Set | Optical Bar Camera | Optical Beam Deflection Method | Optical Beam-Forming Network |
| Optical beam induced current | Optical Beam Induced Current | Optical Beam Induced Resistance Change | Optical Beam Rider Sensor | Optical Beam Smoke Detector |
| Optical Beat Interference | optical bench | Optical Bench | Optical Bench Alignment Support Structure | Optical Bench Alignment System |
| Optical Bench Enclosure | Optical Bench Enclosure Thermal Control | Optical Bgp | Optical Bidirectional Line Switched Ring | Optical Bi-Directional Path-Switched Ring |
| Optical & Biomedical Engineering Laboratory | Optical Biopsy System | Optical Bleaching Agent | Optical Bloch Equations | Optical Booster Amplifier |
| Optical Border Gateway Protocol | Optical Braille Recognition | Optical Branch | Optical Break Lock | Optical Brightening Agent |
| Optical Broadband Exchange | Optical Burst-Switched Network | Optical Burst Switching | Optical Burst Switching in Just Enough Time | Optical Burst Transport |
| Optical Business Unit | Optical Bus Interface Module | Optical Cable Code | Optical Cable Corporation | Optical Cable Distributor Fiber |
| Optical Cable Entrance Facility | Optical Cable Interface | Optical Cable Interface Unit | Optical Cable Signal Repeater | Optical Cable Transmission System |
| Optical Calibration Sphere Experiment | Optical Card Reader Writer | Optical Carrier | Optical Carrier 1 | Optical Carrier 12 |
| Optical Carrier 12 - 622.08 Mbps Leased Line | Optical Carrier 1536 | Optical Carrier 192 | Optical Carrier 24 | Optical Carrier 3 |
| Optical Carrier 3072 | Optical Carrier 3 - 155.52 Mbps leased line | Optical Carrier 48 | Optical Carrier 48 - 2.48832 Gbps Leased Line | Optical Carrier 768 |
| Optical Carrier level 3 - Concatenated | Optical Carrier Level N | Optical Carrier Level One | Optical Carrier Levels | Optical Carrier Level X |
| Optical Carrier Supply Module | Optical Carrier-Suppressed Single Sideband | Optical Carrier Suppression and Separation | Optical Cdma | optical center |
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