Optical fiber sampling optical grating and planar optical wave guide sumpling grating

Abstract

The invention relates to an optical fiber sampling grating and a plane light waveguide sampling grating, where the refractivity variation of the gratings along the fiber core / waveguide axis is periodical and expressed by product of refractivity function and sampling function of a mother grating, where the refractivity function of the mother grating is deltan(z)=delta n0 Sin (4 pi n0 z / lambda B), wherein delta n0 is refractivity variation amplitude of grating, ne is effective refractivity of fiber core / waveguide, and lambdaB is Prague wavelength of grating; Fourier transform of the sampling function has a property that its two sides are symmetrical and change linearly or approximately linearly, adopting Sinc2, second-order rational function or Sinc-Sinc2 combined function; and the Sinc2 sampling optical fiber grating and Sinc2 sampling plane waveguide grating have linear or approximately linear delay spectrum envelopes and paths of each wavelength are symmetrical, able to generate large numbers of constant delay steps less than 1ps and allow wideband operation of signal.

Description

technical field [0001] The invention relates to a photon element, in particular to a fiber sampling grating and a planar optical waveguide sampling grating used as a high-resolution and high-speed signal processor. Background technique [0002] In many cases of communication, signals take different times to travel through different channel media and exhibit different delays (delay is a relative relationship in time) when reaching the next receiver or processor. ps(10 -12 Seconds) short delays have many important applications, such as high-resolution delayed signal processing in microwave phased array beamforming. THz optical sampling is generated by means of multi-wavelength light sources, thereby realizing many high-speed and broadband signal processing functions. Traditional electronic delay lines are only capable of generating ns(10 -9 second) level of short delay, and cannot work in broadband due to frequency dependence. The general fiber delay line overcomes the dif...

AI Technical Summary

Problems solved by technology

Since 1ps corresponds to a fiber length of 0.2mm, writing gratings each time may cause errors caused by adjustments, so when the number of gratings to be written is large, this problem is more serious, so superimposed gratings write gratings multiple times Manufacturing characteristics determine that it is difficult to achieve a large and constant 1ps delay with this method

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