Distributed Bragg Reflection

Distributed Bragg Reflection (DBR) is a phenomenon of light reflection that occurs when a light wave strikes a stack of layers of different compositions, or a corrugated boundary between two semiconductors. This phenomenon can be observed in fiber optic cables, which rely on DBR for their operation. When light enters a fiber, it is reflected off the multiple layers of materials of different refractive indices, creating a “Bragg stack”. The wave is repeatedly reflected off each layer in the stack until it reaches its destination. The period of the layers and the refractive indices determine the wavelength of the light wave that is reflected, allowing the efficient transmission of data.

DBR can also be useful in other types of cables, such as coaxial cables. In these, the layers of insulation and conductors that form the cable act as a Bragg stack and can be used to reflect specific wavelengths of light. This is useful for creating a specific frequency range of signals, which can be used for transmitting data or other signals over the cable.

The use of DBR in cables also helps to reduce signal loss, as the waves are reflected and not absorbed. By reflecting the waves, the signal is kept stable and the desired frequency is maintained. This helps to ensure that the signal is transmitted efficiently and without interference.

Overall, Distributed Bragg Reflection is a phenomenon of light reflection that occurs in cables, allowing the efficient transmission of data and signals. It is used in both fiber optic and coaxial cables, and helps to reduce signal loss and maintain the desired frequency of signals.