How to Tell the Difference Between Fiber Optic Transmitters and Light Sources
:: What are fiber optic transmitters? Optical transmitters generate the light signals carried by a fiber optic communication system. a transmitter includes a light source but also includes signal generation circuit and components such as an electro-optic modulator. The transmitter contains electronics that modulate the light source. At low speeds, the transmitter directly modulates light emission by varying the drive current to the light source. But the transmitter needs a high performance external modulator such as a electro-optic modulator for high speed applications. It maintains a constant drive current to the light source, producing a steady output beam, which passes through the external modulator that produces the 1 and 0 signals. ...
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