This band pass filter operates in either the c 1527 to 1570 nm or l 1570 to 1610 nm band and allows the center frequency to be set with a 4 ghz 32 pm typical accuracy. Acoustooptic tunable filters are useful for selecting specific wavelengths for excitation light in confocal and multiphoton fluorescence microscopy. We present a compact tunable optical filter for spectroscopy applications. Move suspended top mirror by electrostatic or thermal tuning. Us6490075b1 acoustooptic tunable filter hyperspectral. In contrast, hyperspectral imaging systems incorporate optical elements such as liquid crystal tunable bandpass filters or diffraction gratings, which create spectral channels with significantly narrower bandwidths. Newports tunable bandpass fiber optic filter is used to adjust the center wavelength of a narrow passband within a 30 nm range around 1550 nm. Different types of optical filters and their realistic application. Pdf in this paper, we describe an electrostatically tunable optical bandpass filter that is fabricated.
The filter features high isolation, low insertion loss, low backreflection and low polarization sensitivity. The otf930 benchtop type tunable filter has wide variety of filter profile options with combining filter type and number of cascaded filters s1, s2, s3 to suit many fiber optic applications. Color cameras represent the entire spectral range of an image by using three relatively wide spectral channelsred, green, and blue. For this purpose a fabryperot structure was chosen and. Santecs unique linear sliding technology is a breakthrough in filter design that enables precise and continuous wavelength tuning with constant optical properties such as pdl, bandwidth and insertion loss. A single lyot stage is generally not particularly useful, but if. By placing one mirror of a waveguidebased fabryperot interferometer on an electrostaticallyactuated beam, a tunable filter is constructed. The filter comprises a ferrofluidbased emulsion cell emulsion sandwiched between two transparent sheets, a miniature solenoid and a variable direct current source for changing the magnetic field. Dicon fiberoptics directing light with mems technology. Optoplex tunable optical filter optical tunable filter. Pdf a 1d photonic band gap tunable optical filter in 110 silicon. Leading provider of fiber optic wavelength tuning and conditioning solutions narrowband tunable optical filters gaussianshape narrowband tunable optical filter of wltfnm or ne series is built based on freespace optics combing with diffraction grating to produce a gaussianshape transmission. By offering a single mode oscillation and narrow spectral output, distributed feedback dfb semiconductor laser diodes offer excellent optical light sources as well as optical filters for fibre based communications and dense wavelength division multiplexing dwdm systems.
It can be independently controlled by an uart interface or an i2csmbus serial bus and features a userprogrammable channel grid. Gaussianshape tunable optical filter over 780nm up to 120nm wavelength tuning range down to 0. The field dependent tunable optical properties of ferrofluids have been used in developing optical sensors 15,16, tunable optical filters 17, tunable photonic devices 18 etc. It is tunable continuously over a wide spectral range up to 80 nm. Mems mirror tilt angle user can chose the central wavelength of the filter. Mems tunable optical filter with control board overview s tunable optical filter is based on mems technology and is designed for itu c and l band with a fwhm bandwidth of 0. Programmable optical tunable filter otf930 80 nm tunable filter. Coarse tuning by index tuning of compound mirrorscouplers. Manual etalon based fiber optic tunable filter patent pending based on a proprietary thin film cavity filter technology, agiltron offers fiber optic tunable filter with central wavelengths ranging from 450 nm to 2000 nm. Polarizationindependent tunable optical filter with variable. The wavelength tuning is achieved by applying a control voltage. Electrically tunable optical filter utilizing a deformable multilayer mirror download pdf. Single knob tuning for both coarse and fine widely tunable dbr lasers.
A tunable optical filter is ideal for any application requiring wavelength tuning. An electrically tunable optical filter utilizing a deformable multilayer mirror construction. Both of these filters can also be made tunable, such that the central wavelength can be chosen by the user. This tunable filter can be customized to different operation wavelengths and scanning ranges. Dicon fiberoptics, a recognized leader in designing and manufacturing optical components offers a range of tunable optical filters to suit any application. Semrock versachrome the first widely tunable thinfilm optical filters. A novel to our knowledge concept for a tunable birefringent filter with a high dynamic range is proposed and demonstrated by using a stack of liquidcrystal retarders having different thicknesses following an arithmetic sequence. Thinfilm filters are the ideal solution for wavelength selection in most optical systems due to exceptionally high transmission close to 100%, very steep spectral edges, and blocking of optical density 6 or higher over wide spectral regions for. The most desirable characteristic for a tunable optical filter is the reconfigurability in both the central wavelength and the 3 db bandwidth, which meets the need for dynamic channel allocation to increase the spectral efficiency and transmission capacity. In one embodiment, the acoustooptic tunable filter hyperspectral imaging system includes a motion platform for positioning the acoustooptic tunable filter hyperspectral imaging system over successive ycoordinates of a region in a direction substantially parallel to a direction of motion of the motion platform. In addition the channel spacing must be greater than the. Tunable optical filter having a large dynamic range. Tunable optical filter optoplexs tunable optical filter, including tunable bandpass filter and tunable edge filter, is an integrated module, consisting of microoptics and electronics.
An rfphotonic filter and downconverter system based on a compact and fully tunable silicon optical filter. Microsized tunable liquid crystal optical filters arxiv. The filter operates by establishing a radiofrequency standing acoustical wave in an appropriate crystal and creating, in effect, a bulk transmission diffraction grating. An optical filter is a device that selectively transmits light of different wavelengths, usually. Us5739945a electrically tunable optical filter utilizing a. Highly efficient tunable filter for broadband light source.
Applications include sideband noise suppression in erbiumdoped fiber amplifiers edfas and for use in tunable laser transmission systems. Semrock has now developed a revolutionary new optical filter technology thinfilm filters tunable over a wide range of wavelengths by adjusting the angle of incidence with essentially no change in spectral performance patent pending. Manually tunable optical filter tunable range 15 nm manual adjustment of the central wavelength optional in the cband 1520 1570 nm fwhm optional 0. The instrument is designed to allow filters to be cascaded to increase filter isolation with. Tunable optical filter we present a compact tunable optical filter for spectroscopy applications. The filters have a low insertion loss, fast response time, wide tunable range to cover total cband, or lband, or both. Narrowband tunable optical filters gaussianshape narrowband tunable optical filter of wltfnm or ne series is built based on freespace optics combing with diffraction grating to produce a gaussianshape transmission. Distributed feedback laser diodes and optical tunable filters. Osa tunable optical filter having a large dynamic range. Manual tunable optical filters,tunable fiber optic filters. Tunable filters that transmit a 2d imaging beam variety of tunable optical filter technologies, but all compromise at least some critical performance characteristics liquidcrystal tunable filter lctf acoustooptic tunable filter aotf linearvariable filter lvf. Tunable optical filters come in many shapes, sizes, and complexities. Often, the basic working principle is based on the lyot filter but many other designs can be used.
Tunable op ti cal filters polarimeters tunable optical filter principles retarder as the waveplate enables the birefringence to be a function of the applied voltage. Tunable optical filter principles meadowlark optics. This is the first demonstration of a waveguidecoupled mems tunable optical filter in any material system. Tunable optical filters standard tunable optical filters typical filter curves for the tofvis a tunable optical filter consists of multiple liquid crystal variable retarders filter stages protected in a temperaturecontrolled housing. Novel tunable liquid crystal fabryperot filters for fiber. Various schemes have been proposed for such tunable optical filters.
Download pdf file motorized tunable bandpass filter dicons motorized tunable bandpass filter is a ttldriven component that tunes the center wavelength of a narrow passband filter over a 30nm range within the 1550nm window. Tuning is achieved using a piezoelectric actuator controlled. Optoplexs tunable optical filter, also known as optical tunable filter or tunable bandpass filter, is an integrated module, consisting of micro optics and electronics when receiving a stream of optical signals of a plurality of wavelengths from the inputport in, the 2port tunable optical filter directs a selected channel to the outputport ou. Tunable optical filters band rejection is the measure of how much light, which is not within the pass band, gets through the filter. Other specifications including the tuning accuracy of the peak transmission can be optimized in custom filters. Thermally tunable optical filter array, proceedings of spie. They are solidstate filters without moving parts and the tuning voltages are low. Mems tunable optical filter with control board overview sercalos tunable optical filter is based on mems technology and is designed for itu c and l band with a fwhm bandwidth of 0. Semrock versachrome the first widely tunable thinfilm. Tuning range for versachrome 12% spectrum of a semrock versachrome filter for unpolarized light as it is angletuned from 0. Each retarder is between crossed polarizers with its optic axis oriented azimuthally at 45 to the polarizer axis. We present the details of a new tunable optical filter, suitable for selecting different bands of wavelength in the uv, visible and ir regions. The basic characteristics of the filter selection process are illustrated below.
We propose new tunable liquid crystal fabryperot filters for fiber optical telecommunication application. Pdf different types of optical filters and their realistic. Jun 16, 2003 thermally tunable optical filter array thermally tunable optical filter array hohlfeld, dennis 20030616 00. Mems tunable optical filter overview sercalos tunable optical filter is based on mems technology and is designed for itu o, c and l band with 50 ghz or 100 ghz channel spacing. The device is based on a fabryperot interferometer employing. Sep 01, 2019 a new, simple and compact approach for tunable wavelength filtering is introduced with a device called flexible wavelength selector. The tunable filter passes only a narrow bandwidth of light while blocking all others within the desig nated spectral range. Mems monolithic inplane tunable optical filter in both indium phosphide and silicon. Tunable rf antennas and filters for advanced communication. This new device combines the flexibility of a monochromator with the imaging functionality of a thinfilm interference filter, and is ideal for use in both illumination and image acquisition in optical microscopes. This thesis presents the design, the fabrication and the characterization of a new class of siliconbased tunable optical filters. The lightwaves2020 highspeed tunable filter is a tunable optical filter to choose specified wavelengths over a certain range.
A liquid crystal tunable filter lctf is an optical filter that uses electronically controlled liquid crystal lc elements to transmit a selectable wavelength of light and exclude others. With 80 nm tuning range, low insertion loss and manual tuning with tuning knob. Pdf tunable optical filter having a large dynamic range. When a wideband spectrum is injected to the input port, the tunable filter will select a target band for output and.
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