Repetition Rate Stabilization And Optical Axial Mode Linewidth Reduction Of A Chip-Scale Mll Using Regenerative Multitone Injection Locking
Keywords
Laser mode locking; microwave photonics; optoelectronic oscillators; semiconductor lasers; ultrafast optics
Abstract
A novel injection locking architecture is demonstrated to simultaneously improve the axial mode linewidth and stabilize the repetition rate of a monolithically integrated mode-locked laser. First, linewidth reduction is demonstrated via multitone injection locking. Then, the passive mode-locked laser is used as a source to make a coupled optoelectronic oscillator, and its RF spectral characteristics are investigated for different optical delays. A novel combination of these two techniques is established by creating a coupled optoelectronic oscillator via multitone injection locking, using an intracavity element as photodetector to generate the feedback signal to a Mach-Zehnder modulator. Using this combination of methods, the axial mode linewidth is reduced by over 6000× to ∼ 100 kHz and the RF linewidth is reduced by a factor of 70 at -30 dBc, resulting in a 3 dB RF linewidth of 400 Hz. The improvement in RF phase noise at 200 kHz offset is >40 dB. Finally, the system is referenced to a RF synthesizer using a variable voltage phase-shifter and a PID controller. Allan deviation measurements show a resolution limited stability in the repetition rate of 10-10 at 1 second following a 1 τ trend.
Publication Date
7-15-2018
Publication Title
Journal of Lightwave Technology
Volume
36
Issue
14
Number of Pages
2948-2954
Document Type
Article
Personal Identifier
scopus
DOI Link
https://doi.org/10.1109/JLT.2018.2822240
Copyright Status
Unknown
Socpus ID
85044752826 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/85044752826
STARS Citation
Ramirez, Ricardo Bustos; Plascak, Michael E.; Bagnell, Kristina; Bhardwaj, Ashish; and Ferrara, James, "Repetition Rate Stabilization And Optical Axial Mode Linewidth Reduction Of A Chip-Scale Mll Using Regenerative Multitone Injection Locking" (2018). Scopus Export 2015-2019. 9331.
https://stars.library.ucf.edu/scopus2015/9331