Video multiplexer over fiber is the device that convert 1 to multi-channel analog video signal into optical signal via a variety of encoding,then transmit via fiber media, since there are two technology of analog conversion and digital conversion in the process of video signal converting into optical signal, so video multiplexer over fiber can be divided into analog video multiplexer over fiber and digital video multiplexer over fiber. The Optical multiplexer principle is that modulate the signal into optical,transmit video via fiber.

Modulation mode

The Optical multiplexer principle is that modulate the signal into optical,transmit video via fiber, usually has the following modulation mode: 

1) amplitude modulation or Intensity modulation system(AM): all-analog system,inside optical unit emitting diode (LED)’s brightness or intensity changes linearly with the input video amplitude. Amplitude modulated optical signal transmitted to the optical receiving unit through the optical fiber , then convert the signal into analog baseband video. 

2) frequency modulation or pulse frequency modulation (FM): is also an analog system, RF carrier Linear frequency adjust via the input video signal, and modulated carrier also used for optical transmitting unit LED or laser, the frequency-modulated signal transmit the optical receiving unit via optical fiber, the analog video multiplexer over fiber convert signal to digital baseband video.

Video multiplexer over fiber: