Characteristic Analysis Of Transmission For The Arrayed Waveguide Grating Wavelength Division Multiplexer

Arrayed waveguide grating, the key component of dense wavelength division multiplexing, has the advantage of high resolution, high integration and more channels, etc. It has become the research hotspot in the optical communication field.Based on Rayleigh-Sommerfeld diffraction scalar integral formula, the distributing formula of far diffraction field of planar waveguide and the equation of spatial frequency at half maximum intensity of central bright fringe of far diffraction field of planar waveguide in TEo mode are educed. The relation between the width of central bright fringe together with full width at half maximum of central bright fringe and every waveguide parameter is analyzed. The conclusions are useful to measure parameter of planar waveguide and to analyse focal field distribution of arrayed waveguide grating.In most existing literature, the focal field property of arrayed waveguide grating is analyzed only when complex lightwave input from central waveguide, and its method is complicated. In this paper, on the condition that the transverse field of planar waveguide is expressed in gauss function, the simple expression of the focal field distribution and insert loss of arrayed waveguide grating is derived by computing two Fourier transform, which affords handy theoretical basis for designing arrayed waveguide grating.One new method to analyse focal field of arrayed waveguide grating is brought forward, which is named the impulse response function method. The method is simple and feasible. The system of AWG is not linear shift-invariant system, so the output characteristic of the central wavelength inputting from different waveguide is different. Their different characteristic is compared. Lastly, crosstalk characteristic, losscharacteristic and phase error of AWG are analyzed.