![](/assets/images/picto-drapeau-france-3a76576a5d60a512053b4612ab58dae5.png)
3. Single-mode sources
3.1 Distributed Bragg grating (DFB) lasers
During transmission on an optical fiber, the different wavelengths propagate at different speeds: this is the effect of chromatic dispersion. If we use pulses emitted by a multimode laser (emitting at several wavelengths) such as a Fabry-Perot laser, these will widen during transmission and overlap, so that the maximum distances for correct transmission will only be a few hundred meters. To overcome this drawback, lasers emitting at a single wavelength have been developed since the 1980s. The principle is to use wavelength-selective mirrors, i.e. mirrors that reflect only a very narrow spectral range. The most common of these lasers are Distributed FeedBack Lasers (DFB). The mirror is distributed along the cavity: a grating is etched above...
Exclusive to subscribers. 97% yet to be discovered!
You do not have access to this resource.
Click here to request your free trial access!
Already subscribed? Log in!
![](/assets/images/logo-eti-286623ed91fa802ce039246e516e5852.png)
The Ultimate Scientific and Technical Reference
This article is included in
Optics and photonics
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Single-mode sources
Bibliography
Exclusive to subscribers. 97% yet to be discovered!
You do not have access to this resource.
Click here to request your free trial access!
Already subscribed? Log in!
![](/assets/images/logo-eti-286623ed91fa802ce039246e516e5852.png)
The Ultimate Scientific and Technical Reference