Tunable filters are used for regulating the wavelength and adjusting the bandwidth. It is ideal for any wavelength tuning requiring application. Additionally, tunable filtersare the tools which are used for large number of applications including reduction of channel spacing, DWDM (Dense Wavelength Division Multiplexing) systems testing, cascaded emulation of a reconfigurable optical add-drop multiplexer, active module and component testing, and testing of transponders. There are many types of tunable filters available, which are used for a number of applications. For instance, an AOTF (acousto-optic tunable filter) is an electronically tunable solid state filter that helps in modulating the wavelength of several laser lines from one or more sources. Alteration in the acoustic frequency changes the crystal’s diffraction properties that enables faster wavelength tuning. Additionally, it is used for applications including hyper spectral and fluorescence imaging.
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Growing adoption of acousto-optic tunable filters for a wide range of applications around the world, and increasing adoption of liquid crystal tunable filters for electronic imaging application is expected to boost the global tunable filter market. In the acousto-optic tunable filters, there are no moving parts, which ensures an efficient, stable, and reliable tuning of the wavelength. The applied RF frequency on the acousto-optic transducer controls the wavelength that is transmitted. It helps in comprehensive analysis of a spectrum by altering the frequency related to the various ranges of wavelength. Liquid crystal tunable filters (LCTFs) are largely used for machine vision applications including charge coupled devices, as it offers superior image quality. Additionally, LCTF uses liquid crystal elements that can be controlled electrically to select a particular light of a wavelength for sending through the filter excluding other wavelength. The growing adoption of tunable filters for applications such as fluorescence microscopy and hyper spectral imaging and spectroscopy is expected to create novel opportunities for the global tunable filter market.
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Significant investment in R&D to innovate novel tunable filter technology and higher initial cost could be a restraining factor for emerging players in the tunable filter domain, eventually affecting the growth opportunities for the tunable filter market globally. Furthermore, presence of low quality tunable filters in the market could also hamper the growth of the global tunable filter market. However, increasing investment from well-established players in the development of tunable filter technology is expected to overcome this restraint in the near future.