Fig. 1. Schematic of SS-LC-DFB laser structure

Fig. 2. Simulation results. (a) Relationship between W_s and κ; (b) layer refractive index distribution of simulation model; optical field distributions of (c) LC-DFB, (d) SS-LC-DFB (W_s=1 μm), and (e) SS-LC-DFB(W_s=3 μm)

Fig. 3. Carrier distributions. (a) LC-DFB; (b) SS-LC-DFB; (c) lateral distribution of carrier concentration in active region

Fig. 4. SS-LC-DFB laser. (a) Scanning electron microscope (SEM) image; (b) optical microscope image of COS package

Fig. 5. P-I-V characteristic curves of SS-LC-DFB laser

Fig. 6. Device spectrum and peak wavelength as a function of injection current. (a) SS-LC-DFB; (b) LC-DFB

Fig. 7. Optical spot distributions. (a)‒(c) SS-LC-DFB; (d)‒(f) LC-DFB