Welcome to Digitally Tunable Filters page
Tunable filters consist of a collimating optical assembly, an adjustable narrow bandpass filter, and a focusing optical assembly to collect the light again. Tunable filters are available in three versions - a manually adjustable version, a motor driven version for OEM applications, and a digital version.
The digital tunable filter is a hand held unit with a keypad, display, and computer interface. The device works on the principle that by adjusting the angle of incidence between the filter and the incident beam one controls the wavelength at which the filter transmits. The digital version is calibrated such that the user directly enters the wavelength to transmit via the keypad or remotely, through the computer interface. An RS232 interface with cable is standard with GPIB to RS232 converter offered as an optional accessory.
Filter linewidths are normally defined in terms of Full Width at Half Maximum (FWHM). The standard filter used in tunable filters has a smooth, rounded transmission spectrum that is the result of a single Fabry Perot type cavity. A Fabry Perot cavity is simply made up of two reflectors separated by a fixed spacer of some thickness. Other filter profiles are available. For instance, flat top bandpass filters are made by stacking multiple cavities together. By increasing the number of cavities one can increase the roll-off slope therefore improving the outof-band rejection level. For more information on custom filters please contact OZ Optics.
OZ Optics tunable filters now utilize a new optical technique to control Polarization Dependent Losses (PDL). This new design reduces PDL to below 0.3dB, while at the same time making the spectral response polarization insensitive. This feature makes it ideal for today's DWDM system applications.
Tunable filters using singlemode, multimode and Polarization Maintaining (PM) fibers are offered.In general, OZ Optics uses polarization maintaining fibers based on the PANDA fiber structure when building polarization maintaining components and patchcords. However OZ Optics can construct devices using other PM fiber structures. We do carry some alternative fiber types in stock, so please contact our sales department for availability. If necessary, we are willing to use customer supplied fibers to build devices.
| 1. Digitally Tunable Color Filters and Beam Scanners | ||
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Digitally Tunable Color Filters and Beam Scanners. Total internal reflection would be switched on and off spatial segments. NASA's Jet Propulsion Laboratory ...| 2. ECS EPrints Service - Digitally tunable continuous-time filters ... | ||
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| 3. Tunable bandpass sigma-delta digital receiver - Patent 6218972 | ||
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| 4. INTRODUCTION TO DIGITAL FILTERS WITH AUDIO APPLICATIONS | ||
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| 5. Digital FIR Electronic Signal Filters, MatLab GUI, from Frequency ... | ||
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