- optical element
- optical emission
- optical emissivity analyzer
- optical encryption
- optical endoscopy and cold light source
- optical engine
- optical equipment
- optical excitation
- optical excitation of carrier
- optical extraction without prejudice
- optical feedback
- optical fiber
- optical fiber amplifier
- optical fiber and cable
- optical fiber and optical communication
- optical fiber biosensor
- optical fiber cable
- optical fiber communication
- optical fiber connector
- optical fiber device
- optical fiber dispersion compensation
- optical fiber face plate
- optical fiber flange adapter
- optical fiber for communication
- optical fiber geophone