Video Over Fiber Using FM Techniques
We've examined AM transmission. Now the discussion turns to frequency modulation (FM). This scheme simplifies video transmission in some ways, while complicating it in other ways.
Basics of FM
Frequency modulation uses the instantaneous amplitude of a modulating signal (voice, music, data, etc.) to directly vary the frequency of a carrier signal. Modulation index beta (β) describes the ratio of maximum frequency deviation of the carrier to the maximum frequency deviation of the modulating signal.
FM General Equation
In an intensity-based system, the modulation index measures how much the modulation signal affects the light output. To determine this value, let the carrier be xc(t) = Ac•cos ( ...
Get Fiber Optic Video Transmission now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
