Distributed Feedback Laser (DFB Laser) is a type of diode laser that uses a corrugation in the electrically pumped part of the laser to achieve a specific laser wavelength. This corrugation consists of a structured pattern of ridges and grooves in the active layer of the laser. This structure creates an optical feedback loop which allows light of a specific wavelength to be reflected back into the active layer of the laser, thus producing laser light of a single, predetermined wavelength. This technique is used in fiber optic cables to ensure that the signal is transmitted over a long distance with minimal loss.
DFB lasers are the most widely used type of laser in fiber optic cables, as they can provide a high degree of precision and control over the wavelength of the laser. This is important for transmitting data over long distances, as it ensures that the signal does not degrade or become distorted by interference. DFB lasers also require very little power to operate and are relatively inexpensive to produce, making them an ideal choice for applications where cost and efficiency are important.
In addition to their use in fiber optic cables, DFB lasers are also used in a range of other applications such as medical imaging, communications, and sensing. As they are able to produce a specific wavelength, they can be used to measure the intensity of light in a particular area, allowing for more accurate measurements of light in a variety of settings. They are also used in laser surgery, as they can be used to accurately target and burn away tissue without damaging surrounding areas.
Overall, distributed feedback lasers are an essential component of fiber optic cables, as they allow for precise control over the wavelength of the laser and ensure that the signal is transmitted with minimal loss. They are also used in a variety of other applications, making them a versatile and useful tool for a variety of purposes.
