公开(公告)号：US20210226416A1

公开(公告)日：2021-07-22

申请号：US16757786

申请日：2018-10-23

Applicant: Drexel University

Inventor： Afshin S. Daryoush ,  Tianchi Sun

IPC: H01S5/065 ,  H01S5/125 ,  H01S5/068 ,  H01S5/40 ,  H01S5/343 ,  H01S5/026

Abstract: Low phase noise signal generated in a small structure is required for communication and high-resolution imaging. A DBR based multi-mode laser is combined with mode-locking method to build frequency stabilized and tunable RF signal generator. The number of the output modes from each laser is adjusted using reflecting bandwidth of distributed Bragg reflector and electro-absorption (EA) modulator for amplitude control, while the phase section in integrated laser system provides frequency tuning. Mode-locking of 60 laser modes results in a highly frequency stable 10 GHz RF beat-notes with a calculated phase noise of −150 dBc/Hz at 10 kHz offset frequency.

公开(公告)号：US11791608B2

公开(公告)日：2023-10-17

申请号：US16757786

申请日：2018-10-23

Applicant: Drexel University

Inventor： Afshin S. Daryoush ,  Tianchi Sun

IPC: H01S5/065 ,  H01S5/026 ,  H01S5/068 ,  H01S5/125 ,  H01S5/343 ,  H01S5/40

CPC classification number: H01S5/0657 ,  H01S5/026 ,  H01S5/06821 ,  H01S5/125 ,  H01S5/34306 ,  H01S5/4068

Abstract: Low phase noise signal generated in a small structure is required for communication and high-resolution imaging. A DBR based multi-mode laser is combined with mode-locking method to build frequency stabilized and tunable RF signal generator. The number of the output modes from each laser is adjusted using reflecting bandwidth of distributed Bragg reflector and electro-absorption (EA) modulator for amplitude control, while the phase section in integrated laser system provides frequency tuning. Mode-locking of 60 laser modes results in a highly frequency stable 10 GHz RF beat-notes with a calculated phase noise of −150 dBc/Hz at 10 kHz offset frequency.