Ex parte KOMATSU - Page 10

          Appeal No. 1997-4033                                                        
          Application No. 08/589,584                                                  

          LD, which is attractive for Wavelength Division Multiplex                   
          (WDM) systems and coherent optical transmission systems.                    
          Sasaki also explains that these devices include portions                    
          having different band gap energies: "In these devices, the                  
          active layer and the passive waveguide layer, where bandgap                 
          energy of each layer is different, should be smoothly joined                
          along the waveguide direction" (Sasaki at 373, 2d col.).  In                
          the DFB-LD/modulator (Fig. 8), the mask stripe width was 10 Fm              
          for the DFB-LD region and 4 Fm for the modulator region                     
          (Sasaki at 377, 2d col.).  In the three-section tunable DBR-LD              
          (Fig. 11), the mask stripe was 10 Fm for the active region and              
          4 Fm for the other regions (id. at 378, 2d col.).                           
               The examiner's case for the obviousness of the subject                 
          matter of claim 22 is as follows (Answer at 3):                             
                    Rolland teaches a Mach-Zehnder modulator structure                
               including a thick width Y-portion and two thin width                   
               active region arms.  The thick width portion is disclosed              
               as 4 micron[s] wide. . . .                                             
                    Sasaki teaches on page 378 a mask stripe width of 10              
               micron[s] in the active region and 4 micron[s] in the                  
               other regions.  Refer to Figure 11.  On page 374 it is                 
               clearly taught that a wide mask (or narrow width                       
               modulator) results in thick MQW layers which results in                


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