What Are the Advantages of Using TV Optical Cable?
A method of realizing television transmission using an optical cable composed of optical fibers as a medium.
- Chinese name
- TV optical cable transmission
- Foreign name
- TVon optical fiber cable
- Applied discipline
- Communication
- A method of realizing television transmission using an optical cable composed of optical fibers as a medium.
TV Optical Cable Transmission Features
- Optical cable is a broadband and large-capacity transmission method, with stable transmission performance, not affected by electromagnetic interference and weather conditions. Compared with cable transmission, it has obvious advantages in terms of transmission loss, bandwidth, anti-interference, weight, and volume. . Suitable for long and short distance broadband transmission.
TV optical cable transmission principle and method
- Take the analog baseband transmission system as an example, as shown in the figure. The video signal is light-emphasized by the input circuit, low-pass filter, and drive circuit. The sound signal is also light-emphasized on the LED after frequency modulation. The pilot signal is used to monitor the change in transmission attenuation of the entire system, and add this change to the automatic gain control (AGC) circuit to ensure the stability of the system's operation. The dimmed light emitted by the LED is sent to the photodetector (PIN or APD) of the receiver via the optical path system, demodulated and restored to an electrical signal, and processed by filters and other equipment to send video and sound signals respectively.
- Transmission quality is mainly determined by the linearity of light emitting diodes (LEDs) and semiconductor lasers (LDs).
- In addition to coaxial cable transmission in China, cable television (CATV) is mainly used for optical cable transmission, and the latter will become the direction for the development of CATV.