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2. Distributed Bragg reflector - Wikipedia

   en.wikipedia.org/wiki/Distributed_Bragg_reflector

   Time-resolved simulation of a pulse reflecting from a Bragg mirror. A distributed Bragg reflector (DBR) is a reflector used in waveguides, such as optical fibers.It is a structure formed from multiple layers of alternating materials with different refractive index, or by periodic variation of some characteristic (such as height) of a dielectric waveguide, resulting in periodic variation in the ...

3. Dielectric mirror - Wikipedia

   en.wikipedia.org/wiki/Dielectric_mirror

   The reflectivity of a dielectric mirror is based on the interference of light reflected from the different layers of a dielectric stack. This is the same principle used in multi-layer anti-reflection coatings , which are dielectric stacks which have been designed to minimize rather than maximize reflectivity.

4. Distributed Bragg reflector laser - Wikipedia

   en.wikipedia.org/wiki/Distributed_Bragg...

   A distributed Bragg reflector laser (DBR) is a type of single frequency laser diode. Other practical types of single frequency laser diodes include DFB lasers and external cavity diode lasers. A fourth type, the cleaved-coupled-cavity laser has not proven to be commercially viable. VCSELs are also single frequency devices. [1]

5. Fiber Bragg grating - Wikipedia

   en.wikipedia.org/wiki/Fiber_Bragg_grating

   A fiber Bragg grating (FBG) is a type of distributed Bragg reflector constructed in a short segment of optical fiber that reflects particular wavelengths of light and transmits all others. This is achieved by creating a periodic variation in the refractive index of the fiber core, which generates a wavelength-specific dielectric mirror .

6. Laser diode - Wikipedia

   en.wikipedia.org/wiki/Laser_diode

   Such dielectric mirrors provide a high degree of wavelength-selective reflectance at the required free surface wavelength λ if the thicknesses of alternating layers d 1 and d 2 with refractive indices n 1 and n 2 are such that n 1 d 1 + n 2 d 2 = λ/2, which then leads to the constructive interference of all partially reflected waves at the ...

7. PayPal fixes outage that affected thousands worldwide - AOL

   www.aol.com/news/paypal-outage-affects-thousands...

   The company experienced a system issue that affected multiple products including account withdrawals, peer-to-peer payment service Venmo, online checkout and crypto. PayPal said the issue, which ...