Title :
Compact Photonic Integrated Chip for Tunable Microwave Generation
Author :
Chen-Yu Chien ; Yen-Hua Lo ; Yu-Chang Wu ; Shun-Chieh Hsu ; Hung-Ruei Tseng ; Chien-Chung Lin
Author_Institution :
Inst. of Photonic Syst., Nat. Chiao-Tung Univ., Tainan, Taiwan
Abstract :
A tunable microwave generation is demonstrated by monolithically integrated photonic chip, which combines a mirror section and two distributed feedback (DFB) lasers. The focus ion beam technology was employed to achieve high-quality air/semiconductor slab for the mirror. Two DFB lasers (named slave and master lasers, respectively) can operate in a single fundamental mode when they are individually pumped. A microwave signal with the differential frequency between the two lasers can be obtained through optical heterodyning. A tunable microwave signal up to 25.5 GHz can be generated by adjusting the injected currents of the two DFB lasers. A four-wave mixing spectrum was measured and the linewidth of the generated radio frequency signal is 1.9 MHz.
Keywords :
distributed feedback lasers; integrated optics; laser mirrors; laser modes; microwave generation; microwave photonics; multiwave mixing; semiconductor lasers; DFB lasers; bandwidth 1.9 MHz; compact photonic integrated chip; distributed feedback lasers; focus ion beam technology; four-wave mixing spectrum; high-quality air-semiconductor slab; master lasers; mirror; monolithically integrated photonic chip; optical heterodyning; radio frequency signal; single fundamental mode; slave lasers; tunable microwave generation; Distributed Bragg reflectors; Distributed feedback devices; Laser modes; Masers; Optical mixing; Photonics; Semiconductor lasers; Semiconductor laser; heterodyne; microwave generation; radio frequency photonics;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2298983
