Combination component with three ports for light polarization
A technology that combines components and light polarization, applied in the coupling of polarizing components and optical waveguides, etc., can solve the problems of high cost, no reverse blocking, bulky, etc., and achieve the effect of improving quality
Inactive Publication Date: 2006-08-16
IND TECH RES INST
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[0005] In order to provide such an element, many different approaches have been proposed in the previous case, such as the U.S. Patent No. 6331913. Although it has the functions of polarized light synthesis and separation, the structure is quite complicated, the cost is still quite high, and the volume is quite large. It is bulky and does not have the function of reverse blocking, and an additional photoblocker is required
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[0031] According to the three-port optical polarization combining element disclosed in the present invention, such as figure 1 As shown, it includes a birefringent crystal 10, a wedge crystal 20, and an aspheric lens 30. One side of the birefringent crystal 10 is the first optical port 11, and the other side is bonded to the wedge crystal 20, and the wedge crystal 20 is bonded on its plane. The birefringent crystal 10 and the aspherical crystal 30 are placed between the wedge crystal 20 and the second optical port 12 and the third optical port 13 . After entering the birefringent crystal 10, the first light ray 101 exiting the first optical port 11 will be split into two second light rays 102 and third light rays 103 with orthogonal polarization states, and then enter the wedge crystal 20 to change the deflection The output angle then enters the aspheric crystal 30 for deflection and is coupled into the second optical port 12 and the third optical port 13 . The operation is r...
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Two birefringence crystals installed at a side of second light port and a side of third light port receives lights with orthographic polarization states from the said light ports, and makes one of the lights generate a shift. A Faraday rotation crystal receives light from the said pair of birefringence crystal, and outputs the light with their polarization state being rotated a prearranged angle. A halfwave plate receives light from the Faraday rotation crystal and outputs the light with their polarization state being rotated a prearranged angle oppositely. A birefringence crystal installed at a side of first light port receives lights from the halfwave plate, and merges two lights into one light entering into the first light port. The invention uses non-reversible property of the halfwave plate and Faraday rotation crystal to isolate inverted noise and protect laser.
Description
technical field [0001] The invention relates to a three-port optical polarization combining element, which is applied in a high-density wavelength multi-task optical fiber transmission system, in particular to a three-port optical polarization combining element which is a passive high-power combiner and has the function of isolating reverse noise. Background technique [0002] In the era of information explosion, the circulation and transmission of information often become the biggest key to success, and the vigorous development of the Internet has connected the whole world into a global village, shortening the distance of communication between people and the popularity of information transmission And speed, therefore, the transmission distance of information and the flow of data are constantly increasing, and the demand for higher optical power is becoming more and more important, and it can cater to this trend. [0003] Erbium-doped fiber amplifier (EDFA) and Raman amplifi...
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IPC IPC(8): G02B6/27G02B5/30
Inventor 陈明鸿黄承彬胡杰
Owner IND TECH RES INST