Journal
IEEE JOURNAL OF QUANTUM ELECTRONICS
Volume 57, Issue 2, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JQE.2021.3051410
Keywords
Photonic integrated circuits; coupled optoelectronic oscillations; parity-time symmetry; semiconductor mode-locked laser
Categories
Funding
- National Natural Science Foundation of China [61922069]
- NWO Zwaartekracht program on Integrated Nanophotonics
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB43000000]
- Open Fund of State Key Laboratory of Optoelectronic Materials and Technologies (Sun Yat-sen University)
- Doctoral Innovation Fund Program of Southwest Jiaotong University
- China Scholarship Council
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This study demonstrates a tunable PT-symmetric OEO using an integrated mode-locked laser, significantly reducing the footprint of OEOs and generating a stable single-mode oscillating signal. The tunable frequency range is achieved by manipulating the injection currents into the on-chip linear laser cavity.
Originating from the non-Hermitian quantum mechanics, the parity-time (PT) symmetry has been extensively explored to ensure a stable single-mode oscillation for optoelectronic oscillators (OEOs), while avoiding additional extremely challenging ultrahigh-Q filters. Enabled by the emerging photonics integrated circuit (PIC) technology, we report the tunable PT-symmetric OEO by using an integrated mode-locked laser, as a striking advance to reduce the footprint of OEOs. Stable single-mode oscillating signal at 24.5 GHz has been generated with a phase noise of -108 dBc/Hz @ 10 kHz frequency offset. In particular, a tunable frequency range from 24 to 25 GHz is achieved by manipulating the injection currents into the well-designed on-chip linear laser cavity. This work exhibits a breakthrough in conceptual integrated microwave photonic devices, and also accelerates the real-world applications of fundamental physical theory of PT symmetry to information industry.
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