1402 THE BELL SYSTEM TECHNICAL JOURNAL, NOVEMBER 1956 



converter for a given change in operating wavelength. This loss is given 

 by the following formula: 



Mismatch loss 



= 10 log 



4Zd 



10 



R2 



1 + 



R2 



+ 



+ 



wLo tan 2iri/\g, 



db (5) 





For the wafer miit, calculation shows that the rectifier is matched to the 

 waveguide at a wavelength of 5.4 X 10"^ meters for d/a = j and ^ = 

 3.14 X 10^ . If now the wavelength is changed to 6.3 X 10~^ meters, 

 without re tuning (17 per cent change) the mismatch loss calculated by 

 (5) is 1.6 db. It was stated in the text that a number of wafer units gave 

 measured mismatch losses of from 1.6 to 4.0 db for a 17 per cent change 

 in wavelength without retuning. This is considered to be a reasonable 

 correlation between calculations and measurements. 



