Fig. 5From: Widely Tunable Single/Dual RF Signal Generation by a Monolithic Three-Section DFB LaserDual-mode a optical and b RF spectra under different current combinations. The currents of the S2 and M sections are kept the same while the current of the S1 section is varied from 20 to 70 mA (shown in a). In the trace A, λM<λS1<λS2, and the sequence becomes λM<λS2<λS1 in the trace HBack to article page