Description     Claims     Drawing  

JPS57196592A   [0003] 
US61564375A   [0016] 
US61586327A   [0019]  [0041] 
US050026A   [0041] 

Simultaneously at two wavelengths (5.0 and 7.5 [micro]m) singlemode and tunable quantum cascade distributed feedback lasers   [0003] 
Theory of Cascaded Quarter Wave Shifted Distributed Feedback Resonators   [0038]