Apparatus for coupling electromagnetic energy and method of making

Abstract

An electromagnetic coupler comprising: a coupling waveguide adapted for receiving input modes along an input axis, propagating coupling modes along a coupling axis, and transmitting output modes along an output axis, the output axis being not parallel to the coupling axis; and an output waveguide disposed adjacent the coupling waveguide and adapted for receiving the output modes.

1 . An electromagnetic coupler comprising: 
 a coupling waveguide adapted for receiving input modes along an input axis, propagating coupling modes along a coupling axis, and transmitting output modes along an output axis, said output axis being not parallel to said coupling axis; and    an output waveguide disposed adjacent said coupling waveguide and adapted for receiving said output modes.    
     
     
         2 . The coupler of  claim 1  wherein at least one of said coupling waveguide and said output waveguide comprises a photonic band gap material.  
     
     
         3 . The coupler of  claim 1  wherein at least one end of said coupling waveguide is tapered.  
     
     
         4 . The coupler of  claim 3  wherein said at least one end of said coupling waveguide has a widthwise taper.  
     
     
         5 . The coupler of  claim 4  wherein said coupling waveguide has a taper angle in a range from about 5 degrees to about 10 degrees.  
     
     
         6 . The coupler of  claim 3  wherein said at least one end of said coupling waveguide has a heightwise taper.  
     
     
         7 . The coupler of  claim 6  wherein said coupling waveguide has a taper angle of about 45 degrees.  
     
     
         8 . The coupler of  claim 1  wherein said coupling waveguide further comprises an active layer disposed adjacent said output waveguide.  
     
     
         9 . The coupler of  claim 8  wherein said active layer comprises at least one quantum well.  
     
     
         10 . The coupler of  claim 9  wherein said quantum well comprises a multilayer quantum well.  
     
     
         11 . The coupler of  claim 8  wherein said active layer comprises a material exhibiting at least one effect selected from the group consisting of the electro-optic effect, Kerr effect, thermo-optic effect, and acousto-optic effect.  
     
     
         12 . The coupler of  claim 8  wherein said active layer comprises a material adapted for promoting lasing in coupling waveguide.  
     
     
         13 . The coupler of  claim 1  further comprising an input waveguide disposed adjacent said coupling waveguide and adapted for transmitting said input modes along said input axis, said input axis being not parallel to said coupling axis.  
     
     
         14 . The coupler of  claim 13  wherein at least one of said input waveguide, said coupling waveguide, and said output waveguide comprises a photonic band gap material.  
     
     
         15 . An electromagnetic coupler comprising: 
 a coupling waveguide adapted for receiving input modes along an input axis, propagating coupling modes along a coupling axis, and transmitting output modes along an output axis, said output axis being not parallel to said coupling axis; and    an output waveguide disposed adjacent said coupling waveguide and adapted for receiving said output modes,    at least one of said coupling waveguide and said output waveguide comprising a photonic band gap material,    at least one end of said coupling waveguide being tapered.    
     
     
         16 . The coupler of  claim 15  wherein said at least one end of said coupling waveguide has a heightwise taper.  
     
     
         17 . The coupler of  claim 15  wherein said at least one end of said coupling waveguide has a widthwise taper.  
     
     
         18 . The coupler of  claim 15  wherein said coupling waveguide further comprises an active layer disposed adjacent said output waveguide.  
     
     
         19 . The coupler of  claim 18  wherein said active layer comprises at least one quantum well.  
     
     
         20 . The coupler of  claim 18  wherein said active layer comprises a material exhibiting at least one effect selected from the group consisting of the electro-optic effect, Kerr effect, thermo-optic effect, and acousto-optic effect.  
     
     
         21 . The coupler of  claim 18  wherein said active layer comprises a material adapted for promoting lasing in coupling waveguide.  
     
     
         22 . The coupler of  claim 15  further comprising an input waveguide disposed adjacent said coupling waveguide and adapted for transmitting said input modes along said input axis, said input axis being not parallel to said coupling axis.  
     
     
         23 . A method of making an electromagnetic coupler comprising the acts of: 
 providing a coupling waveguide adapted for receiving input modes along an input axis, propagating coupling modes along a coupling axis, and transmitting output modes along an output axis, said output axis being not parallel to said coupling axis; and    disposing an output waveguide adjacent said coupling waveguide so as to receive said output modes.    
     
     
         24 . The method of  claim 23  wherein at least one of said coupling waveguide and said output waveguide comprises a photonic band gap material.  
     
     
         25 . The method of  claim 23  further comprising tapering at least one end of said coupling waveguide.  
     
     
         26 . The method of  claim 25  wherein said act of tapering at least one end of said coupling waveguide comprises producing a heightwise taper.  
     
     
         27 . The method of  claim 25  wherein said act of tapering at least one end of said coupling waveguide comprises producing a widthwise taper.  
     
     
         28 . The method of  claim 23  wherein said coupling waveguide further comprises an active layer disposed adjacent said output waveguide.  
     
     
         29 . The method of  claim 28  wherein said active layer comprises at least one quantum well.  
     
     
         30 . The method of  claim 29  wherein said quantum well comprises a multilayer quantum well.  
     
     
         31 . The method of  claim 28  wherein said active layer comprises a material exhibiting at least one effect selected from the group consisting of the electro-optic effect, Kerr effect, thermo-optic effect, and acousto-optic effect.  
     
     
         32 . The method of  claim 28  wherein said active layer comprises a material adapted for promoting lasing in coupling waveguide.  
     
     
         33 . The method of  claim 23  further comprising disposing an input waveguide adjacent said coupling waveguide, said input waveguide being adapted for transmitting said input modes along said input axis, said input axis being not parallel to said coupling axis.  
     
     
         34 . The method of  claim 33  wherein at least one of said input waveguide, said coupling waveguide, and said output waveguide comprises a photonic band gap material.  
     
     
         35 . A method of making an electromagnetic coupler comprising the acts of: 
 providing a coupling waveguide adapted for receiving input modes along an input axis, propagating coupling modes along a coupling axis, and transmitting output modes along an output axis, said output axis being not parallel to said coupling axis;    disposing an output waveguide adjacent said coupling waveguide so as to receive said output modes;    tapering at least one end of said coupling waveguide,    at least one of said coupling waveguide and said output waveguide comprising a photonic band gap material.    
     
     
         36 . The method of  claim 35  wherein said coupling waveguide further comprises an active layer disposed adjacent said output waveguide.  
     
     
         37 . The method of  claim 35  further comprising disposing an input waveguide adjacent said coupling waveguide, said input waveguide being adapted for transmitting said input modes along said input axis, said input axis being not parallel to said coupling axis.