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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 .
Figure 1: A schematic of a refractive index change of a 2π-FBG-type addressed fiber Bragg structure (a), its spectral response (b). λ B is the central (Bragg) wavelength, Ω is the address frequency, S 1 (λ) - S 3 (λ) denote transfer matrixes describing the uniform sections of the AFBS, S φ (λ) denotes transfer matrix describing the phase ...
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 ...
An acousto-optic modulator (AOM), also called a Bragg cell or an acousto-optic deflector (AOD), uses the acousto-optic effect to diffract and shift the frequency of light using sound waves (usually at radio-frequency). They are used in lasers for Q-switching, telecommunications for signal modulation, and in spectroscopy for frequency control.
The Bragg bandwidth is only independent of length in the strong grating limit. More generally, the bandwidth depends on both the length and the variation in the index. In the weak grating limit, the bandwidth depends only on the grating length and not the index variation [2] [3]. In addition, further clarification would help for some of the ...
When off the light beam is undiverted, the intensity of light directed at the Bragg diffraction angle is zero. When switched on and Bragg diffraction occurs, the intensity at the Bragg angle increases. So the acousto-optic device is modulating the output along the Bragg diffraction angle, switching it on and off.
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The grating waveguides consists of many waveguides, each having a constant length increment (ΔL). Light is coupled into the device via an optical fiber (1) connected to the input port. Light diffracting out of the input waveguide at the coupler/slab interface propagates through the free-space region (2) and illuminates the grating with a ...