Tm mems tunable filter products optoplex c o r p o r a t i. Various schemes have been proposed for such tunable optical filters. Tunable optical filter principles retarder as the waveplate enables the birefringence to be a function of the applied voltage. The peak transmission is a function of the center wavelength of the pass band as well as the number of optics in the tunable filter. Tfs can be utilized from uv ultraviolet through ir infrared spectral regions. The wavelength tuning is made by manually rotating a precise micrometer. They deliver superior performance whatever your application. Narrowband tunable optical filter of wltfnm or ne series is built based on freespace optics combing with diffraction grating to produce a gaussianshape transmission. 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.
Acoustooptic tunable filters florida state university. This tunable bandpass filter is used to select the wavelength of interest, across the 1535 to 1565 nm wavelength range with 0. It can be used to apply model reduction algorithms to a linear firstorder problem. These filters have a fwhm 5 nm tunable bandpass and transmission window and exhibit maximum transmission, t 5% 60%, for polarized light. Exfos optical filters are wavelength tunable and bandwidth adjustable. Related content a micromachined inplane tunable optical filter using the thermooptic effect of crystalline silicon.
Tunable filters are available in three versions a manually adjustable version, a motor driven version for oem applications, and a digital version with a display and computer interface. Manual tunable fiber optical filter 1nm photonwares co. Light can be coupled between the two principal polarizations of birefringent fiber by using a traveling acoustic wave to produce a spatially periodic stress in the fiber. The highly reliable tuning mechanism uses an integrated micromirror with switching time below 50 ms and insertion loss below 3 db. The authors present a new method for realising a continuously tunable reflectively tapped optical transversal filter processor. Tunable optical filters can be bandpass filters, for example, where the center wavelength of the pass band can be tuned. Tuning is achieved using a piezoelectric actuator controlled. By changing the acoustic frequency, the wavelength at which. Microsized tunable liquid crystal optical filters arxiv.
In this paper, a single optical ring resonator connected to a sagnac loop is used to demonstrate theoretically a novel narrow band optical filter response that is based on sagnac phaseshift df. Simply stated, when light passes through a waveplate e. Manual tunable optical filters,tunable fiber optic filters. Optimization of tunable guidedmode resonance filter based.
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. This means that the peak transmission is highly dependent on the. Pdf tunable optical filter of porous silicon as key component for a. When a wideband spectrum is injected to the input port, the tunable filter will select a target band for output and. A continuously tunable optical notch transversal filter is demonstrated with a decade tuning range, the highest reported to date. A benchmark for the heat transfer problem, related to modeling of a tunable optical filter, is presented. This is based on the use of long chirped fibre bragg gratings as tapping elements. Polarizationindependent tunable optical filter with variable. Mems monolithic inplane tunable optical filter in both indium phosphide and silicon.
The main difference with the original lyot filter is that the fixed wave plates are replaced by switchable. The pass band can be shifted to any desired region of the spectrum. Often, the basic working principle is based on the lyot filter but many other designs can be used. The wavelength of light selected is a function of the frequency of the rf applied to the crystal. Efficient low loss design delivers high finesse, resolution and power handling performance fast response. Pdf tunable optical filter based on sagnac phaseshift. By placing one mirror of a waveguidebased fabryperot interferometer on an electrostaticallyactuated beam, a tunable filter is constructed. This is the first demonstration of a waveguidecoupled mems tunable optical filter in any material system. The filter centre frequency is also controllable with 1 ghz increments. When receiving a stream of optical signals of a plurality of wavelengths from the inputport in, the 2port tunable optical filter directs a. Dts0152 electrically controlled fabryperot tunable filters. A microstrip bandpass filter with 2 independently tunable. Mks tfs sensor platforms have been on the market since 2008 with more than 2500 systems deployed. The filter operates by establishing a radiofrequency standing acoustical wave in an appropriate crystal and creating, in effect, a bulk transmission diffraction grating.
The tunable optical filter is characterized by comprising n periodic filter bodies with adjustable wavelengths, n is larger than or equal to 2, and the n periodic filter bodies with adjustable wavelengths are not same in free spectrum range fsr and are sequentially cascaded through optical fibers. To fabricate a tunable optical filter with a fast response in the near infrared region, a tunable guidedmode resonance gmr filter using graphene was proposed and its. Fiber optic tunable filter patent pending based on a proprietary thin film cavity filter technology, agiltron offers fiber optic tunable filters with central wavelengths of 1060nm, 10nm, 1550nm and 2000nm. Easily hold a versachrome filter and mount it to a manual or. Fiber fabryperot tunable filters ffp interferometers filter controllers micron optics unique, patented fiber fabryperot ffp filters are characterized by their rugged, lowloss, supercavity performance featuring. However, all tend to require compromise in at least some critical performance characteristics in order to achieve tunability, thus demanding a careful analysis of the strengths and limitations of. Tunable filters consist of a collimating optical assembly, an adjustable narrow bandpass filter, and a focusing optical assembly to collect the light again. It can be independently controlled by an uart interface or an i2csmbus serial bus and features a userprogrammable channel grid. A thin film coated interference filter is located between two angled fiber optic collimators. It features a cascade of multiple stages, each one of. Based on a proprietary thin film cavity filter technology, agiltron offers fiber optic tunable filters with central wavelengths of 1060nm, 10nm, 1550nm and 2000nm.
Acoustooptic tunable filters are useful for selecting specific wavelengths for excitation light in confocal and multiphoton fluorescence microscopy. 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. Variety of tunable optical filter technologies, but all compromise at least. Mks instruments platform of innovative optical analyzers based on tunable filter spectroscopy tfs provides realtime gas analysis, while delivering customers a substantially lower total cost of ownership. Tunable optical filter principles meadowlark optics. A tunable optical filter is ideal for any application requiring wavelength tuning.
Polarizationindependent tunable optical filter with. The use of bulk optics in combination with diffraction gratings leads to high selectivity, low insertion losses and dispersion. It is tunable continuously over a wide spectral range up to 80 nm. In a grating based tunable filter, an input beam that includes multiple wavelengths is directed into an input fiber of a circulator. It is an integrated module consisting of a mems chip, microoptics and control electronics and interface. The highly reliable tuning mechanism uses an integrated micromirror with switching time below 50.
Tunable optical filter having a large dynamic range. A single lyot stage is generally not particularly useful, but if. Abstractwe present a polarizationindependent tunable optical filter with variable bandwidth based on silicononinsulator soi waveguides. An alldielectric tunable optical filter based on the thermooptic effect to cite this article. When receiving a stream of optical signals of a plurality of wavelengths from the inputport in, the. Optical coherence tomography optical performance monitoring spectrum analysis tunable optical noise filtering tunable channel drop for ultra dwdm tunable sources optical sensing product description the key to the simple and elegant design of the inline fabryperot tunable filter is the lensless all fiber construction. Tunable semiconductor lasers continue to be in just about everyones list of important components for future fiber optic networks. Pdf we present a microspectrometer based on a tunable interference filter for infrared or visible light that scans the desired part of the spectrum.
Polarization interference filters are described which can have a pass band ranging from a fraction of an angstrom to several hundred angstroms in width. An alldielectric tunable optical filter based on the. Meadowlark optics tunable optical filters facilitate spectral analysis of not only a collimated beam, but also more impor tantly an entire object. The coupling matrix with the lossy resonators is synthesized and used to analyze the characteristic of the. A costeffective implementation of a tunable optical filter is based on the resonant coupler principle 50,51. Semrock versachrome the first widely tunable thinfilm. Tm mems tunable filter products c o r p o r a t i o n mems technology optoplexs mems tunable optical filter is based on a patented microoptic design with mems tuning technology. Tunable filter elements in thru out drop add applications reconfigurable oadm. However, all tend to require compromise in at least some critical performance characteristics in order to achieve tunability, thus demanding a careful.
The optical design is an extension of dicons proven mems switch design, and. Tunable optical filter optoplexs tunable optical filter, including tunable bandpass filter and tunable edge filter, is an integrated module, consisting of microoptics and electronics. It demultiplexes the incoming multiwavelength signal and selects the desired wavelength channel using a tilting mems mirror as the tuning mechanism. 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. If unpolarized light is incident on the filter then the peak transmission will be half of the polarized peak transmission.
Pdf a novel concept for micromechanical tunable optical filter tof with poroussiliconbased photonic crystals which provide wavelength tuning of. The fs02 braggmeter tunable optical filter features a proprietary cavity design without guiding optics resulting in a compact, robust and vibrationresistant device. Dts0051 manually adjustable polarization insensitive. Tunable optical filter basics a tunable optical filter works on the principle of polarization dispersion. When a wideband spectrum is injected to the input port, the. Dicon fiberoptics, a recognized leader in designing and manufacturing optical components offers a range of tunable optical filters to suit any application. An aotf consists of a crystal in which radio frequencies rf acoustic waves are used to separate a single wavelength of light from a broadband source, fig. For a fixed acoustic frequency, maximum coupling occurs when the input optical wavelength is such that the beat length of the fiber equals the acoustic wavelength. Some of the exciting applications of this material includes leak free seals, smart cooling, micro robot, micromechanical sensor, nondestructive defect sensors, tunable optical filters, actuators. Manual tunable fiber optical filter 1nm etalonbased download product spec pdf based on a proprietary thin film cavity filter technology, agiltron offers fiber optic tunable filters with central wavelengths of 1060nm, 10nm, 1550nm and 2000nm. Although the tunable resonators have unloaded q lower than 100, the insertion loss of the filter is not increased.
Thus by applying a different voltage, the location of the peaks can be moved and a filter can be tuned. The beam is collimated and then is reflected by a rotationally actuated mirror. Tunable optical filter we present a compact tunable optical filter for spectroscopy applications. The polarizationindependent operation is achieved through the use of a polarization splitterrotator and a polarization rotatorcombiner, which are based on a bilevel adiabatic taper and an asymmetric directional coupler. Pdf tunable optical filter having a large dynamic range. The beam is then magnified and propagates onto and through a transmission diffraction grating which causes the different wavelengths of the transmitted beam to deflect into different. 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.
Manual tunable fiber optical filter 1nm etalonbased. The transmission band is formed by the superposition of the polarized channel spectra. Related content an optical technique for the detection of surfacedefects in ferromagnetic samples john philip, c babu rao, baldev raj et al. Tunable filter spectrometers mks instruments platform of innovative optical analyzers based on tunable filter spectroscopy tfs provides realtime gas analysis, while delivering customers a substantially lower total cost of ownership. Tunable optical filter precise control of filter centre frequency and bandwidth the waveshaper 100s tunable optical filter allows the user to set the the filter bandwidth from 10 ghz 0. The main factor, of course, is that these filters are not tunable and so a different optic is required for each desired wavelength. We present a compact tunable optical filter for spectroscopy applications.
When a wideband spectrum is injected to the input port, the tunable filter will. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. 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. An alldielectric tunable optical filter based on the thermo. We present the details of a new tunable optical filter, suitable for selecting different bands of wavelength in the uv, visible and ir regions. Manual tunable fiber optical filter 1nm agiltron inc. Pdf tunable optical filters with wide wavelength u. Tm mems tunable filter products optoplex c o r p o r a t i o n. There are a variety of different tunable optical filter technologies that have been developed. Gaussianshape tunable optical filter over 780nm up to 120nm wavelength tuning range down to 0. Additionally, various tuning mechanisms for thinfilm filters are highlighted. Pdf tunable optical filters with wide wavelength range based on. 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. Temperature control is important since the birefringence of the.
Alternative is a bank of fixed wavelength lasers rx tx node 2b node 4b node 3b node 1b node 1r node 3r node 2r node 4r. These tunable filters are based on the fixed filters discussed by lyot and evans. 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. 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. Dicons mems tunable filter is a compact 2port device based on dicons proprietary mems technology.
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