Most OEOs utilize the transmission characteristics of an optical modulator together with a fiber-optic delay line to convert light energy into stable, spectrally pure RF/microwave reference signals.
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Another type of opto-mechanical lens is the design of Joshua Silver, and uses liquid pressure against a diaphragm to control focus of a lens.
Next, the key elements of radio electronics, including filters, amplifiers, oscillators, mixers, and antennas are described.
Electronic oscillator, an electronic circuit that produces a periodic, oscillating signal, often a sine wave or a square wave