Final answer:
WDM is a true version of FDM for fiber optics that allows multiple streams of data to be sent through one cable using different light wavelengths. It uses the principle of refraction and total internal reflection to transmit signals efficiently.
Step-by-step explanation:
True or false: WDM is a version of FDM used in fiber-optic cables. The statement is true. Wavelength Division Multiplexing (WDM) is indeed a version of Frequency Division Multiplexing (FDM) that is specifically adapted for use in fiber-optic communication.
WDM works by sending multiple streams of data, each on a separate wavelength (or color) of light, through the same fiber-optic cable without interfering with each other. This is a form of optical multiplexing that takes advantage of the high bandwidth and low loss properties of optical fibers.
The phenomenon of refraction is crucial in the functioning of fiber optic cables. When light signals enter the fiber optic medium at a certain angle, they are bent due to refraction, which allows them to be guided down the fibers.
This is known as the principle of total internal reflection—a foundational principle for fiber optics, to efficiently transmit signals over long distances while minimizing loss and crosstalk.
True. Wavelength Division Multiplexing (WDM) is a technique used in fiber-optic cables to transmit multiple signals simultaneously. It allows multiple wavelengths of light to be transmitted over a single fiber, effectively increasing the capacity of the cable. This is achieved by using different colors (wavelengths) of light to represent different signals.