We demonstrate an integrated bandpass filter with the. Photonic microsystems specifically, their wavelength dependence allows grating modulators to be used as tunable optical filter and tunable optical synthesizers. 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. Onchip programmable optical filter based on multimode interference. The filter consists of a phase modulator with hibi pigtails sandwiched between. When a wideband spectrum is injected to the input port, the tunable filter will. 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. A tunable optical filter works on the principle of polarization dispersion. Design and analysis of a cascaded microring resonatorbased. It is tunable continuously over a wide spectral range up to 80 nm. The mirror separation of a few micrometres leads to a free spectral. 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.
Related content an optical technique for the detection of surfacedefects in ferromagnetic samples john philip, c babu rao, baldev raj et al. Pdf tunable optical filters with wide wavelength u. The bragg mirrors are used to realize two optical filter configurations. Semrock has now developed a revolutionary new optical filter technology. The first is a tunable fabryperot cavity composed of two mirrors, where. Manual tunable optical filters,tunable fiber optic filters. Lltf laser line tunable filter volume bragg gratings. Temperature control is important since the birefringence of the. A thermooptical tunable filter based on the vernier effect of cascaded microring resonators, which can expand the free spectrum range fsr and the tuning range, has been designed and simulated. Agiltron further offers high optical power handling up to 10 w.
An electrically tunable optical filter with ultrafast tuning time of a few picoseconds is proposed and demonstrated. Narrowband tunable optical filter of wltfnm or ne series is built based on freespace optics combing with diffraction grating to produce a gaussianshape transmission. The fs02 braggmeter tunable optical filter features a proprietary cavity design without guiding optics resulting in a compact, robust and vibrationresistant device. In this paper, we propose an additional noise free, independent center frequency and bandwidth tunable optical filter based on stimulated brillouin scattering sbs losses. Optoplexs tunable optical filter, including tunable bandpass filter and tunable edge filter, is an integrated module, consisting of microoptics and electronics. In this paper, we propose a novel tunable transversal photonic rf notch filter based on opto. In this paper, we describe an electrostatically tunable optical bandpass filter that is fabricated in 110 silicon. 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. The incomparable efficiency and outofband rejection offered by our unique optical filtering technology are ideal for tunable excitation sources in fluorescence and raman spectroscopy. A benchmark for the heat transfer problem, related to modeling of a tunable optical filter, is presented. In this section, two applications of memstuned microresonators with a varying cavity length are addressed.
When a wideband spectrum is injected to the input port, the tunable filter will select a target band for output and. For convenience, many of our optical filters are available mounted or in a kit. Microsized tunable liquid crystal optical filters arxiv. Mems monolithic inplane tunable optical filter in both indium phosphide and silicon. When a wideband spectrum is injected to the input port, the. In a grating based tunable filter, an input beam that includes multiple wavelengths is directed into an input fiber of a circulator. The company designs, develops, manufactures, and markets high performance fiberoptic products to communications networks, and provides customized solutions to instrument, defense, spectroscopy and sensing industries. However, the free spectral range fsr is limited to about 7. Optical filters thorlabs optical filters include an extensive collection of dielectriccoated filters, colored glass filters, neutral density filters, spatial filters, and a tunable optical filter based on liquid crystal technology. In this paper we present a novel memsbased concept for tunable optical filters for use in wavelengthdivision multiplexing wdm systems.
Structure of the tunable optical filter based on freespace optics. The transmission band is formed by the superposition of the polarized channel spectra. This is the first demonstration of a waveguidecoupled mems tunable optical filter in any material system. View pdf catalogues and other online documentation. Tuning is achieved using a piezoelectric actuator controlled.
By placing one mirror of a waveguidebased fabryperot interferometer on an electrostaticallyactuated beam, a tunable filter is constructed. Thus by applying a different voltage, the location of the peaks can be moved and a filter can be tuned. Pdf freespace tunable and drop optical filters using vertical. Our filter housings are designed to be easy to integrate into existing optical systems. Wl photonics wltfe6 series tunable optical filter is built on the athermal platform of rystal ench with high quality diffraction grating. When receiving a stream of optical signals of a plurality of wavelengths from the inputport in, the 2port tunable optical filter directs a. 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. Easily hold a versachrome filter and mount it to a manual or motorized. 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. 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. The authors present a new method for realising a continuously tunable reflectively tapped optical transversal filter processor. Design and analysis of a cascaded microring resonator.
The frequency spacing between two successive transmission peaks is know as free spectral range see figure 2. Manually tunable bandpass filter tf tuning range 0. Thorlabs optical filters include an extensive collection of dielectriccoated filters, colored glass filters, neutral density filters, spatial filters, and a tunable optical filter based on liquid crystal technology. The beam is collimated and then is reflected by a rotationally actuated mirror. By suppressing the outofband signal with two broadened symmetric sbs losses, tunable pass bandwidths from 500 mhz to 9. Pdf tunable optical filters with wide wavelength range based on. Polarization interference filters are described which can have a pass band ranging from a fraction of an angstrom to several hundred angstroms in width. Acoustooptic tunable filters are useful for selecting specific wavelengths for excitation light in confocal and multiphoton fluorescence microscopy. Semrock versachrome the first widely tunable thinfilm.
The pass band can be shifted to any desired region of the spectrum. The filter directs a selected narrow transmission band among the input lights to the output port. Gaussianshape tunable optical filter over 780nm up to 120nm wavelength tuning range down to 0. Photonwares produces fiber coupled tunable filters with industrial leading performance and value. Line width analysis of a tunable optical filter based on. 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. Tunable silicon optical filters using deformable bragg gratings or tunable fabryperot fp cavities were recently proposed 1 and demonstrated 2 3 4. We present a polarizationindependent tunable optical filter with variable bandwidth based on silicononinsulator soi waveguides. There are a variety of different tunable optical filter technologies that have been developed. A single lyot stage is generally not particularly useful, but if. Polarizationindependent tunable optical filter with. Tunable optical filter we present a compact tunable optical filter for spectroscopy applications.
The filter centre frequency is also controllable with 1 ghz increments. 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. The filter operates by establishing a radiofrequency standing acoustical wave in an appropriate crystal and creating, in effect, a bulk transmission diffraction grating. The center wavelength of the selected passband can. A continuously tunable optical notch transversal filter is demonstrated with a decade tuning range, the highest reported to date. Osa sharp tunable and additional noisefree optical filter. Narrowband tunable optical filter of wltfnm or ne series is built based on free space optics combing with diffraction grating to produce a gaussianshape transmission. 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. 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. A tunable optical filter is ideal for any application requiring wavelength tuning. Thinfilm filters tunable over a wide range of wavelengths by adjusting the. The filters are based on a microscopic etalon microcavity that has been developed in our lab.
Tunable filters micron optics a world leader in optical. Optoplex corporation is a leading supplier of cuttingedge photonic components, modules and subsystems for dynamic wavelength management and signal conditioning. 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. We present the details of a new tunable optical filter, suitable for selecting different bands of wavelength in the uv, visible and ir regions. We have both gaussian, using dielectric multilayer coatings, and flattop, using gratings, filter profiles available. Pdf tunable thermooptic filter for wdm applications. Thermally tunable optical filter array, proceedings of spie.
Manual tunable fiber optical filter 1nm photonwares co. Tuning is achieved through thermal modulation of the resonators optical thickness. Acoustooptic tunable filters florida state university. Sharp tunable and additional noisefree optical filter. This tunable bandpass filter is used to select the wavelength of interest, across the 1535 to 1565 nm wavelength range with 0. In this paper, we propose an additional noisefree, independent center frequency and bandwidth tunable optical filter based on stimulated brillouin scattering. Thin film filters tunable over a wide range of wavelengths by adjusting the.
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. B depends on both the optical signal wavelength and the frequency of the driving rf source, this device can be used to make a tunable optical filter. Often, the basic working principle is based on the lyot filter but many other designs can be used. However, all tend to require compromise in at least some critical performance characteristics in order to achieve tunability, thus demanding a careful. A thin film coated interference filter is located between two angled fiber optic collimators. Jun 16, 2003 a novel memsbased tunable optical filter, an essential component for monitoring and reconfiguration of optical wavelengthdivision multiplexing networks, is presented. Ghz and the independent center frequency tunability are demonstrated. Widely bandwidthtunable silicon filter with an unlimited free. Narrowband tunable optical filters gaussianshape narrowband tunable optical filter of wltfnm or ne series is built based on free space optics combing with diffraction grating to produce a gaussianshape transmission.
Manual pm fiber optic tunable filter patent pending based on a proprietary thin film cavity filter technology, agiltron offers pm fiber optic tunable filter with central wavelengths ranging from 450 nm to 2000 nm. An integrated tunable optical filter tof based on thermooptic effect in silicon on insulator soi rib waveguide is designed and simulated. These tunable filters are based on the fixed filters discussed by lyot and evans. Braggmeter optical tunable filter is an industrial component ideal for most optical filtering applications in test and measurement. The device is based on a fabryperot interferometer employing multiple solidstate silicon cavities and siliconbased dielectric bragg mirrors. Polarizationindependent tunable optical filter with variable.
Fabryperot filters are best suited in terms of miniaturization and optical throughput. Additionally, various tuning mechanisms for thinfilm filters are highlighted. This is based on the use of long chirped fibre bragg gratings as tapping elements. Deep reactiveion etching is the main process that is used to fabricate the. 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. These tunable filters are based on two proprietary technologies that utilize athermal multi etalon cavities or gratings, offering attractive features of covering near all wavelength, very low loss, unparallel low cost, setandhold operation, wide tuning range, ultrabroad band visible to lwir. It can be independently controlled by an uart interface or an i2csmbus serial bus and features a userprogrammable channel grid. Pdf a novel concept for micromechanical tunable optical filter tof with poroussiliconbased photonic crystals which. Vlsi processor, the broadband light source can be spectrally sliced and attenuated, hence realizing a two. Line width analysis of a tunable optical filter based on free. It is widely used in dwdm systems dynamic wavelength selection, dwdm signal separation, optical performance monitoring, field tunable optical noise filtering and optical amplifier noise suppression, etc. B, and the rf frequency f is used as the tuning mechanism. Dicon fiberoptics, a recognized leader in designing and manufacturing optical components offers a range of tunable optical filters to suit any application. Tunable optical filters come in many shapes, sizes, and complexities.
The center wavelength of the selected passband can be tuned continuously over the entire range. Sharp tunable and additional noisefree optical filter based on. A single lyot stage is generally not particularly useful, but if several of them are stacked together, the free spectral range can be increased, while the pass band. Fiberoptic filter is an optical fiber instrument used for wavelength selection, which can select desired wavelengths to pass and reject the others. Tunable optical filter optoplexs tunable optical filter, including tunable bandpass filter and tunable edge filter, is an integrated module, consisting of microoptics and electronics.
Tunable optical filter principles meadowlark optics. The filter features high isolation, low insertion loss, low backreflection and low polarization sensitivity. It can be used to apply model reduction algorithms to a linear firstorder problem. 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. For the filter application, the diffracted beam is collected around the bragg angle. Pdf freespace mems tunable optical filter on 110 silicon. The main difference with the original lyot filter is that the fixed wave plates are replaced by switchable.
862 1231 1387 1281 399 120 1517 1537 1397 886 1212 1286 173 667 879 712 1462 1512 501 306 1225 816 194 601 203 1550 745 507 809 1493 1132 1092 60 191 1178 972 1391 312 579 324 1235 1161 332 409 304 129 1380 1247