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Optical Filter

Photonics Spectra
Oct 2010
Yenista OpticsRequest Info
 
Yenista Optics has introduced its diffraction grating-based XTM-50 manually tunable optical filter with adjustable bandwidth down to 6.25 GHz (50 pm). The filter has a wavelength tuning range from 1450 to 1650 nm and a bandwidth adjusting range from 50 to 800 pm. It allows engineers to extract channels with low insertion loss and no distortion of signal, thanks to its 0.2-dB flatness and 550-dB/nm steep edges. The filter provides a solution for studying new modulation formats, high-bit-rate transmission and cascaded reconfigurable optical add/drop multiplexers.


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GLOSSARY
diffraction grating
A glass substrate carrying a layer of deposited aluminum that has been pressure-ruled with a large number of fine equidistant grooves, using a diamond edge as a tool. Light falling on such a grating is dispersed into a series of spectra on both sides of the incident beam, the angular dispersion being inversely proportional to the line spacing. By proper shaping of the diamond edge, however, the grooves can be formed in such a way as to concentrate most of the energy into a single spectral...
optical filter
A device with characteristics of selective transmittance, capable of passing a certain part of the electromagnetic spectrum while being opaque to the other portions. Means of producing filters varies considerably. Color filters (for the visual) usually consist of glass, gelatin or plastic containing dyes or pigments. Band pass filters are found in signal processing and are commonly fabricated via electronics and complex circuitry and are designed to pass and reject parts of the spectrum based...
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