UNIT I OPTICAL NETWORKING COMPONENTS
First- and second-generation optical networks, Components: couplers, isolators, circulators,multiplexers, filters, amplifiers, switches, and wavelength converters.
optical-networks_components.pdf | |
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Difference between transmission and reflection gratings :
A transmission grating is made of a transparent substance, so that the diffracted light goes through the grating and strikes a screen/detector/etc. on the other side.
Transmission gratings offer a basic simplicity for optical designs that can be beneficial in fixed grating applications such as spectrographs. The incident light is dispersed on the opposite side of the grating at a fixed angle. Transmission gratings are very forgiving for some types of grating alignment errors.
By necessity, transmission gratings require relatively coarse groove spacings to maintain high efficiency. As the diffraction angles increase with the finer spacings, the refractive properties of the materials used limit the transmission at the higher wavelengths and performance drops off. The grating dispersion characteristics, however, lend themselves to compact systems utilizing small detector arrays. The gratings are also relatively polarization insensitive.
A reflection grating is made of a reflective/opaque substance; so the diffracted light bounces off and strikes a screen/detector/etc. on the same side.
Transmission gratings offer a basic simplicity for optical designs that can be beneficial in fixed grating applications such as spectrographs. The incident light is dispersed on the opposite side of the grating at a fixed angle. Transmission gratings are very forgiving for some types of grating alignment errors.
By necessity, transmission gratings require relatively coarse groove spacings to maintain high efficiency. As the diffraction angles increase with the finer spacings, the refractive properties of the materials used limit the transmission at the higher wavelengths and performance drops off. The grating dispersion characteristics, however, lend themselves to compact systems utilizing small detector arrays. The gratings are also relatively polarization insensitive.
A reflection grating is made of a reflective/opaque substance; so the diffracted light bounces off and strikes a screen/detector/etc. on the same side.
For further details
http://www.ondaxinc.com/PDFs/whitepaper-…
http://optics.org/cws/product/P000000876
http://en.wikipedia.org/wiki/Diffraction…
http://www.optometrics.com/products_grat…
http://optics.org/cws/product/P000000876
http://en.wikipedia.org/wiki/Diffraction…
http://www.optometrics.com/products_grat…
cross_bar_switches.pdf | |
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optical_switches_.ppt | |
File Size: | 2915 kb |
File Type: | ppt |