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Completely lighting strength equilibria apparatus and method based on cascades non-linearity

A technology of optical intensity and second-order nonlinearity, applied in the field of optical communication, can solve problems such as device structures that have not been reported yet, achieve the effects of reducing optical power requirements, strong feasibility and realizability, and reducing device size

Inactive Publication Date: 2008-04-16
BEIHANG UNIV
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Problems solved by technology

The cascaded nonlinear effect has been used in all-optical switching and modulation devices, but the device structure for all-optical power equalization has not been reported

Method used

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  • Completely lighting strength equilibria apparatus and method based on cascades non-linearity
  • Completely lighting strength equilibria apparatus and method based on cascades non-linearity
  • Completely lighting strength equilibria apparatus and method based on cascades non-linearity

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Embodiment Construction

[0051] The equalization device in FIG. 1 includes a polarization control device, a polarizer, an input lens, a second-order nonlinear optical material, an output lens, a compensator, and an analyzer. The input light with fluctuating intensity is collimated and incident, and is output after passing through the equalization device.

[0052] Assume that after the input light passes through the polarizer, the light intensity I IN = 2εE 0 2 , where E 0 is the amplitude of s-light and p-light, ε is the permittivity of air, ε≈1, then the complex amplitude of s-light and p-light is shown in formula (8)

[0053] E p = E 0 e iωt E s = ...

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Abstract

The invention discloses a device and method capable of realizing full light intensity equalization in digital space or optical fiber optical communication system. The device adopts an optical material with a second-order nonlinear optical characteristic and makes use of nonlinear phase shift caused by cascade nonlinear effect to realize optical phase modulation related with light intensity. The device also realizes variation in output light intensity through parts such as a polarizer, an analyzer and a phase compensator, realizes equalization of variation in input light intensity by setting a due phase delay relationship, and obtains the output signal with nearer light intensity distribution.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a method for performing all-optical power equalization on digital optical signals with strong light intensity fluctuations. Background technique [0002] In free space laser communication systems, light waves propagate in space media such as the atmosphere. In the atmosphere, the inhomogeneity and random fluctuation of the distribution of temperature, air flow, aerosol, etc. cause the optical refractive index to have an obvious random distribution in space and random changes with time, resulting in turbulence effects. For the optical signal transmitted in the atmosphere, when passing through the above-mentioned random atmospheric medium, the phase of the beam at different spatial positions will be randomly affected, resulting in its intensity, phase and propagation direction and other parameters fluctuating randomly with the change of turbulent conditions . For me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35G02F1/355G02F1/01G02B27/28
Inventor 郑铮赵欣安琳刘建胜
Owner BEIHANG UNIV
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