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Dimmable filter

An optical filter and filter technology, which is applied in the field of optical communication devices, can solve problems such as difficult optical path compensation optimization and difficult adjustment, and achieve the effect of reducing insertion loss and polarization-dependent loss, and simple optical structure design

Active Publication Date: 2013-02-06
SHANGHAI BRANCH FUZHOU GAOYI COMM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, 4 parallel optical paths need to be generated on the back and forth optical paths. On the one hand, it is not easy to adjust, and on the other hand, it is not easy to realize the compensation and optimization of the optical paths.

Method used

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Examples

Experimental program
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Effect test

Embodiment 2

[0030] Example 2: Will Figure 1a , Figure 1b The walk-off crystal 206 which plays the role of polarization splitting in the center is replaced with a PBS prism (polarization beam splitter), and the optical path can be changed to Figure 3a , Figure 3b situation shown. exist Figure 3a In the top view of , after the light input by the collimator 101 passes through the combination of the walk-off crystal 201 and the half-wave plate 203, it becomes two beams of vertically polarized light. reflection. The two beams of light pass through the Faraday rotator 109, the half-wave plate 110, the prisms 111 and 112, the filter 113 and the situation reflected by the rectangular prism 114 for two times next. Figure 1a , Figure 1b same. When the light travels from left to right to the PBS prism 306, the polarization changes to the horizontal direction, passes through the PBS prism 306, and then passes through the combination of the half-wave plate 204 and the walk-off crystal 202 ...

Embodiment 3

[0031] Example 3: If the Figure 1a , Figure 1b The Walk-off crystals in the original scheme of Example 1 are all replaced with PBS, then it can produce Figure 4a , Figure 4b scheme shown. The light input by the collimator 101 is redirected by the reflective prism 401 and then enters the PBS prism 403, and is divided into two beams of horizontal polarization and vertical polarization.

[0032] First look at one beam of horizontal polarization wherein, change direction through reflective prism 402 and then pass through the half-wave plate 404 whose optical axis direction is 45 °, become vertical polarization, then with Figure 1a , Figure 1b Similarly, after passing through the Faraday rotator 109 , the half-wave plate 110 , the prisms 111 and 112 , and the filter 113 , and being reflected by the rectangular prism 114 , the propagation direction is opposite to the original, and the position changes. when this light is on Figure 4a After passing through filter 113, pris...

Embodiment 4

[0035] Embodiment 4: In addition to the above two cases, slightly changing the light spot shaping part in Embodiment 1 will produce Figure 5a , Figure 5b scheme shown. This solution is almost completely consistent with the solution in Embodiment 1, except that the directions of prism 111 and prism 112 are deflected by 90° relative to the prism group in Embodiment 1, and there is no difference in realization principle.

[0036] In addition, the combination of shaping prisms in all the above embodiments can be replaced by a combination of cylindrical lenses, such as Image 6 shown. The rectangular prisms, rhombic prisms and reflective prisms in all the above schemes can also be replaced by reflecting mirrors. The resulting scheme is completely consistent with our original scheme in terms of realization principle.

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Abstract

The invention relates to the field of optical communication devices, in particular to a dimmable filter. A beam at the input end of the dimmable filter is divided into two spatially separated paths which have o beams through a polarizing beam-splitting element unit and a half-wave plate, wherein the o beam of a first beam path is exchanged to a second beam path through a polarizing rotating element unit, a beam shaping element unit and an optical filter element sequentially and through one right-angle prism and is reversely output to be an e beam; the o beam of a second beam path is also exchanged to the first beam path and is reversely output to be the e beam; one path of reversely output e beams of the first beam path and the second beam path is reverted to be the o beam through the half-wave plate, and is combined with the other path of e beam by a polarizing beam-combining element unit and is output to an output end collimator; and the optical filter element is tunable. The dimmable filter has a simple optical structure design, effectively reduces insertion loss and polarization dependent loss and also miniaturizes the devices.

Description

technical field [0001] The present invention relates to the field of optical communication devices, in particular to a tunable optical filter, which is applied to a reconfigurable optical up-down multiplexing / demultiplexing device (ROADM) and an optical cross-connect (OXC) system and transmission in a DWDM system. sensory network, etc. Background technique [0002] Tunable optical filter is a basic optical component, which is essentially a bandpass filter, that is, only specific wavelength signals are allowed to be transmitted, and other wavelength signals are reflected. It can be applied to reconfigurable optical up-down multiplexing / demultiplexing (ROADM) and optical cross-connect (OXC) systems and sensor networks in DWDM systems. For example, it is used to offset the gain slope of the optical amplifier, thereby reducing the deviation between channels of the optical signal power of each receiving end. The tuning method of the existing tunable optical filter is generally ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/01G02F1/09
Inventor 王春亮耿立升赵强
Owner SHANGHAI BRANCH FUZHOU GAOYI COMM CO LTD
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