A device and method for online writing grating with high sidelobe suppression ratio
A technology with high rejection ratio and high side lobe, which is applied in optics, light guide, cladding fiber, etc., to achieve the advantages of difficulty in use and reliability, and reduce the effect of fiber jitter
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Embodiment 1
[0029] Such as figure 1 As shown, the device for writing a grating array with a high sidelobe suppression ratio online includes a laser writing device 1, a shaping concave lens 2, a shaping convex lens 3, a focusing cylindrical lens 4, a gradient attenuation film 5, a phase mask 6 and a bare fiber 7 , the shaping concave lens 2 and the shaping convex lens 3 are used in pairs to expand and shape the beam emitted by the laser writing device, the focusing point of the focusing cylindrical lens 4 is located 1-2mm behind the position of the optical fiber, and the The gradient attenuation sheet 5 is located 3-5 cm behind the focusing cylindrical lens, and the phase mask 6 is located 3-5 mm in front of the bare fiber 7 .
[0030] Such as figure 2 The structural diagram of the gradual attenuation sheet 5 shown in the figure shows that the attenuation loss in the central area is relatively low, with the lowest point being 0dB, and the loss at the upper and lower edges is relatively l...
Embodiment 2
[0035] The device for on-line writing grating array with high side lobe suppression ratio includes a 193nm excimer laser, shaping lens group, a focusing lens, a phase mask and a gradient attenuation film. The laser emits a rectangular pulsed beam with a certain frequency interval through parameter setting. After the beam is shaped and expanded by a set of optical lenses, it is focused on the bare fiber behind the phase mask after passing through a gradual attenuation sheet. At , the single-pulse in-line writing grating array is realized. The shaping lens group includes a concave lens and a convex lens, which shape the output spot of the laser to make the energy of the spot uniform. The focusing lens is a spherical plano-convex cylindrical lens, the convex surface of the lens faces the side of the phase mask, and the focal point of the focusing lens is located on the rear optical fiber. The gradient attenuation sheet is a plane lens, the center of which is a low loss area, and...
Embodiment 3
[0037] A method for online writing a grating array with a high sidelobe suppression ratio, which includes the following steps:
[0038] Step 1: Control the movement speed of the optical fiber, preset the parameters of the laser writing device 1 when it is in a stable state, and select the appropriate beam pulse intensity;
[0039]Step 2: Adjust the shaping lens group, including the shaped concave lens 2 and the shaped convex lens 3, to obtain a suitable spot length for writing the grating; through the adjustment of the shaping lens group, the grating writing length ranges from 6mm to 10mm, so that the bandwidth of the writing grating and The spectral shape quality meets the requirement of use.
[0040] Step 3: According to the adjusted light spot length of the written grating, select a gradient attenuation film 5 with a suitable upper and lower width;
[0041] Step 4: Adjust the focusing cylindrical lens 4 to focus the light beam in the horizontal direction, and the focus is ...
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