Variable optical attenuator based on liquid crystal cladding polymer optical waveguide

A technology of optical waveguide and polymer, which is applied in the direction of light guide, optics, instruments, etc., can solve the problems of inability to realize integration, large volume, etc., and achieve the effect of increasing dynamic tunable range, large tuning efficiency, and compact structure

Active Publication Date: 2013-07-10
ZHEJIANG UNIV
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Problems solved by technology

The traditional VOA based on liquid crystal materials utilizes the different responses of liquid crystals to O light and E light, and combines birefringent crystals to realize the function of optical attenuator, which is too large to be integrated.

Method used

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  • Variable optical attenuator based on liquid crystal cladding polymer optical waveguide
  • Variable optical attenuator based on liquid crystal cladding polymer optical waveguide
  • Variable optical attenuator based on liquid crystal cladding polymer optical waveguide

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with accompanying drawing.

[0022] Such as figure 1 As shown, a tunable optical attenuator based on a liquid crystal cladding polymer optical waveguide adopts a vertical electrode structure, which specifically includes a silicon substrate 1, a lower electrode 2, a silicon dioxide lower cladding layer 3, and a polymer optical waveguide Core layer 4 , liquid crystal lower alignment layer 5 , liquid crystal spacer layer 6 , liquid crystal layer 7 , liquid crystal upper alignment layer 8 , and upper electrode 9 . The silicon substrate 1 is a heavily doped silicon material with a conductivity of 2×10 -2 More than Ω·cm; directly above the silicon substrate 1, a 7-10 μm thick silicon dioxide lower cladding layer 3 is grown by chemical vapor deposition, and its refractive index is 1.45; directly below the silicon substrate 1, a layer of metal nickel is electroplated by electroless plating , this layer of me...

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Abstract

The invention discloses a variable optical attenuator based on liquid crystal cladding polymer optical waveguide. The variable optical attenuator comprises a silicon base, a bottom electrode, a silica lower cladding, a polymer optical waveguide core layer, a liquid crystal lower directional layer, a liquid crystal partition layer, a liquid crystal layer, a liquid crystal upper directional layer and a top electrode. Transmitting light can be transmitted with low loss in the polymer optical waveguide core layer under the condition of no impressed voltage; refractive index of the liquid crystal layer is gradually increased when the impressed voltage is gradually increased; and the transmitting light is gradually spread into the liquid crystal layer acting as the waveguide cladding layer and is not served as a guide film to transmit, so that loss is increased and functions of the variable optical attenuator can be realized. The variable optical attenuator based on the liquid crystal cladding layer polymer optical waveguide has the advantages that the variable optical attenuator has a compact structure and is convenient and easy to manufacture, do not have limits to long wavelength, and working bandwidth is large, and practical requirements in the photo-communication field, the integrated optics field and the like can be met.

Description

technical field [0001] The invention belongs to the field of optoelectronic devices, and in particular relates to an adjustable optical attenuator based on a liquid crystal cladding polymer optical waveguide. Background technique [0002] Variable Optical Attenuator (VOA) is an indispensable key device in optical communication system. The main function of the VOA is to reduce the optical signal or balance the optical power difference between channels. Especially with the application of dense wavelength division multiplexing (DWDM) technology and EDFA in optical communication systems, gain flattening or channel power equalization must be performed on multiple optical signal transmission channels, and dynamic saturation must be performed at the optical receiver. All of these make VOA an indispensable key device. VOA has become the core component of optical devices such as dynamic channel equalizer (DCE), variable power optical multiplexer (VMUX), and optical add-drop multipl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13G02F1/137G02B6/122
Inventor 时尧成蔡涛刘清坤何赛灵
Owner ZHEJIANG UNIV
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