Patent ID: 11921366
Assignee: CORNING INCORPORATED
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 17:
18. A method of coupling light from a first core of a multicore optical fiber to a second core of the multicore optical fiber, the method comprising:
directing a plurality of photons generated by a photon generator optically coupled to an input end of the multicore optical fiber comprising a plurality of cores disposed in a cladding into the first core of the plurality of cores, wherein:
the plurality of cores comprise the first core and the second core; and
the first core comprises a first propagation constant β1, the second core comprises a second propagation constant β2, the cladding comprises a cladding propagation constant β0, and, 
        
          
            β
            1
          
          -
          
            β
            2
          
        
        
      
      
        
        
          
            β
            2
          
          -
          
            β
            0
          
        
        
      
    
    <
    
      1
      2
    
  
  ;, and
engaging the multicore optical fiber with a modulator, thereby generating a long period fiber grating comprising a grating period Ω in the multicore optical fiber, wherein (2π)/(|β1−β2|)=Ω such that the first core is coupled with the second core wherein:
the first core and the second core comprise a modal mismatch M12;, M
    12
  
  =
  
    
      
      
        
          β
          1
        
        -
        
          β
          2
        
      
      
    
    
      2
      ⁢
      
        C
        12, where C12 is a coupling coefficient for coupling from the first core to the second core; and
M12 is greater than 10.