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Reflecting Bragg Grating (RBG) Specifications

Specifications for reflecting Bragg grating (RBG) in PTR glass

Product code for Reflecting Bragg Gratings (RBG) has the following main structure:

RBG-WL-DE :
WL – resonant wavelength (nm)
DE – diffraction efficiency (%)

Additional grating parameters are:

IA-EA-T×W×H-AR :

IA – incident Bragg angle (deg)

EA – exit angle after the grating (deg)

T, W, H – grating thickness, width, and height (mm×mm×mm)

AR – optional antireflection coating (narrowband NB or broadband BB); if not specified – uncoated grating (U)

Reference parameters can be requested to specify grating design for particular applications:

GL-AS-WS-d-n-RIM-SL :

GL – grating losses (%)

AS – angular selectivity (mrad)

WS – wavelength or spectral selectivity (nm)

d – grating period (um)

n – refractive index at resonant wavelength

RIM – refractive index modulation (ppm)

SL – grating slant angle inside the glass wafer (deg)

Transmitting Bragg gratings can be designed and manufactured within the following range of their parameters
See Table 1
Reflecting Bragg gratings can be designed and manufactured within the following range of their parameters in Table 1:
See Table 1
For a sample grating RBG-980-80, the full set of the grating parameters and their tolerances is shown in Table 2:
See Table 2

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