Arrayed waveguide grating device

Abstract

A grating device has a waveguide array cyclically arranged. A horned waveguide is used in a star coupler of the grating device. An optical signal is divided into streams. The streams are slanted from original central axes. Or, a waveguide having an asymmetrical structure is used. Thus, a flat-top pass-band of the optical signal is obtained. The present invention can be used in any optical device.

1 . A cyclic arrayed waveguide grating device using a horned waveguide, comprising: 
 a first star coupler, said first star coupler obtaining streams of an optical signal;    a waveguide array, said waveguide array obtaining said streams of said optical signal having a phase difference between each two neighboring streams;    a second star coupler, said second star coupler transmitting streams of said optical signal having various wavelengths; and    a horned waveguide,    wherein said cyclic arrayed waveguide grating device using said horned waveguide obtains a flat-top pass-band of said optical signal through said first star coupler and said second star coupler coordinated with said horned waveguide.    
   
   
       2 . The waveguide grating device according to  claim 1 , 
 wherein said first star coupler comprises: 
 a waveguide input, said waveguide input inputting said optical signal at a first end of said waveguide input; and  
   a first slab waveguide, said first slab waveguide being connected with a second end of said waveguide input at a first end of said first slab waveguide, said first slab waveguide being connected with first ends of said waveguide array at second ends of said first slab waveguide, said first slab waveguide obtaining and transmitting said streams of said optical signal.    
   
   
       3 . The waveguide grating device according to  claim 1 , 
 wherein said optical signal has a number of waveguides not less than one.    
   
   
       4 . The waveguide grating device according to  claim 1 , 
 wherein said waveguide array comprises a plurality of arrayed single-mode waveguides; and    wherein each two neighboring single-mode waveguides have a length difference.    
   
   
       5 . The waveguide grating device according to  claim 1 , 
 wherein said second star coupler comprises: 
 a second slab waveguide, said second slab waveguide being connected with second ends of said waveguide array at first ends of said slab waveguide to obtain interferential focuses of said streams of said optical signal having various wavelengths; and  
   waveguide outputs, said waveguide outputs being connected with second ends of said second slab waveguide, said waveguide outputs having said streams of said optical signal having various wavelengths coupled into various output ends.    
   
   
       6 . The waveguide grating device according to  claim 1 , 
 wherein said horned waveguide is located between a waveguide input of said first star coupler and a first slab waveguide of said first star coupler; and    wherein said flat-top pass-band of said optical signal is obtained through a plurality of compensating central axes of a plurality of waveguide outputs of said second star coupler coordinated with said horned waveguide    
   
   
       7 . The waveguide grating device according to  claim 1 , 
 wherein a plurality of said horned waveguides is located between a second slab waveguide of said second star coupler and a plurality of waveguide outputs of said second star coupler;    wherein said flat-top pass-band of said optical signal is obtained by a complementary asymmetrical two-peak light-field distribution through compensating central axes of said plurality of waveguide outputs of said second star coupler coordinated with said horned waveguide.    
   
   
       8 . The waveguide grating device according to  claim 1 , 
 wherein a plurality of said horned waveguides is located between a second slab waveguide of said second star coupler and a plurality of waveguide outputs of said second star coupler;    wherein said flat-top pass-band of said optical signal is obtained by an asymmetrical structure of said plurality of waveguide outputs through a complementary asymmetrical two-peak light-field distribution coordinated with said horned waveguide.    
   
   
       9 . The waveguide grating device according to  claim 1 , 
 wherein said horned waveguide has an end of said horned waveguide wider than the other end of said horned waveguide.    
   
   
       10 . The waveguide grating device according to  claim 1 , 
 wherein said horned waveguide has a shape selected from a group consisting of a functional shape a trigonometric-functional shape, a convex-curved shape, a tapered shape, a tapered-and-straight mixed shape, a two-sectional tapered shape, a three-sectional tapered shape, a tapered-and-convex-curved mixed shape, a taper-and-multimode-interference-structure mixed shape, a multimode interference structure shape, a directional coupler shape, a tapered directional coupler shape, a convex-curved taper type directional coupler shape, a Y branch's shape, a channel waveguide type branch's shape, a convex-curved taper type branch's shape, a taper and channel waveguide type branch's shape, a tapered multimode interference structure shape, a trigonometric-functional multimode interference structure shape, a convex-curved multimode interference structure shape, a concave-curved multimode interference structure shape, a two-sectional taper type concave multimode interference structure shape, a two-sectional taper type convex multimode interference structure shape, a two-sectional curved taper type convex multimode interference structure shape and a three waveguide type directional coupler shape.    
   
   
       11 . The waveguide grating device according to  claim 5 , 
 wherein, after said streams of said optical signal are transmitted into said second slab waveguide, multi-slit interferences are obtained at first and then constructive interferences are obtained at front ends of said second slab waveguide.