LCOS (liquid crystal on silicon) optical filter
A technology of optical filter and silicon-based liquid crystal, which is applied in the direction of instruments, optics, nonlinear optics, etc., can solve the problems of uneven beam deflection angle and low precision
Inactive Publication Date: 2015-01-28
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0003] The invention provides a silicon-based liquid crystal optical filter, which solves the problems of uneven beam deflection angle and low precision of existing LCOS optical filters
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[0052] Below in conjunction with accompanying drawing and embodiment the invention is further described.
[0053] like figure 1 As shown, the embodiment of the present invention is composed of a transmission type diffraction grating, a convex lens, an LCOS panel and a signal control circuit, and the transmission type diffraction grating, convex lens and LCOS panel are sequentially arranged on the optical path;
[0054] The selected incident wavelength division multiplexing (WDM) beam contains four channels, the channel spacing is 100GHZ, and the wavelength is λ 1 = 1.5484 microns, λ 2 = 1.5492 microns, λ 3 = 1.550 microns, λ 4 =1.5508 microns, the number of lines of the transmission diffraction grating is 2400 lines / mm, the convex lens is a Fourier lens, and the focal length is 100 mm;
[0055] like figure 2 As shown, the LCOS panel of this embodiment includes a liquid crystal cell matrix, a column data driver and a row scanning driver, and the liquid crystal cell matrix...
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The invention relates to a LCOS (liquid crystal on silicon) optical filter, and belongs to an optical electronic device, which aims at solving the problems of nonuniform defection angle of light beams and low precision in the existing LCOS optical filter. The LCOS optical filter consists of a transmission type diffraction grating, a convex lens, a LCOS panel and a signal control circuit, wherein the transmission type diffraction grating, the convex lens and the LCOS panel are sequentially arranged on an optical path, the signal control circuit consists of a static random memory and a central processing unit, the central processing unit is respectively connected with a line data driver and a row scanning driver of the LCOS panel, a voltage comparison table is stored in the static random storage, and table items of the voltage comparison table comprise liquid crystal unit addresses and corresponding digital voltage codes. The LOCS optical filter has the advantages that the number and the precision of the deflection angles are greatly improved, the length of a center wave and the step length and precision of the bandwidth adjusting are correspondingly and greatly improved, and a function of adjustable bandwidth and center frequency is realized. The LCOS optical filter can be applied to occasions with different requirements in the fields of optical electronics and optical communications, and an on-site programmable property is realized.
Description
technical field [0001] The invention belongs to optoelectronic devices and is applicable to the fields of optoelectronics and optical communication. Background technique [0002] The main technical means to realize multi-port tunable optical filters at home and abroad include microelectromechanical system (MEMS) rotating mirror technology, digital micromirror device (DMD) technology, liquid crystal (LC) technology and liquid crystal on silicon (LCOS) technology. Liquid crystal on silicon technology can realize high-resolution adjustment steps, so as to realize continuous adjustment of bandwidth and central wavelength, but the current main principle of liquid crystal on silicon to realize beam deflection is based on the principle of beam deflection based on periodic blazed gratings, and the discrete deflection angle β Determined by the following formula: β=sin -1 (λ / Md), where λ is the wavelength of the beam, M is the phase order in one cycle, and d is the width of each phas...
Claims
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IPC IPC(8): G02F1/29
Inventor 罗风光明博
Owner HUAZHONG UNIV OF SCI & TECH