Fig. 1. Output power as a function of bias current.

Fig. 2. Optical spectrum at 2 A.

Fig. 3. RF spectrum with optical compression at 2.24 A (Iph=1.6  mA).

Fig. 4. Fundamental tone with and without optical compression.

Fig. 5. Sampling scope trace of detected pulse train for passive mode-locking.

Fig. 6. Autocorrelation trace with optical compression at 2.14 A.

Fig. 7. General principle.

Fig. 8. View of the monolithic chip for millimeter-wave transmission.

Fig. 9. General view of the test setup.

Fig. 10. Electrical and optical spectra obtained for different laser biasing conditions.

Fig. 11. Wireless data transmission experiment diagram.

Fig. 12. Eye diagram for 200  MBit/s transmission.

Fig. 13. Setup for precise control and stabilization of broadband arbitrary frequency sweeps by fibered self-heterodyne technique. Abbreviations are defined in the text.

Fig. 14. (a) Setup for the predistortion correction, using an out-of-loop optical frequency discriminator. (b) Nominal frequency sweep. (c) Predistorted control voltage. (d), (e) Error from the nominal frequency sweep: in blue for the free-running laser (with the predistorted control voltage) and in green for the optoelectronic feedback loop in which the optical frequency sweep is phase locked to a reference electronic signal.

Fig. 15. Solid-state DFL source cavity principle. V1 and V2 are the voltages that allow the independent control of the two frequencies.

Fig. 16. Phase noise of one of the optical modes (red curve) and phase noise of the beat note at 10 GHz (blue curve).

Fig. 17. Locking scheme of one of the DFL optical lines on a high-Q FRR. PDH: Pound–Drever–Hall setup. PID: proportional-integral-derivative controller.

Fig. 18. Phase noise of one of the optical modes: free running (red curve) and locked (orange curve). Phase noise of the beat note when locked (blue curve).