Frequency Response Enhancement of Optical Injection-Locked Lasers

• Published in: IEEE journal of quantum electronics Vol. 44; no. 1; pp. 90 - 99
• Main Authors: Lau, E.K., Hyuk-Kee Sung, Wu, M.C.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.01.2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Amplitude modulation; Bandwidth; Broadband; Damping; Differential equations; Exact sciences and technology; Exact solutions; Frequency response; Fundamental areas of phenomenology (including applications); injection locking; Laser modes; Laser noise; Laser optical systems: design and operation; Laser theory; Lasers; Mathematical analysis; Mathematical models; Modulation; Nonlinear optics; Optical modulation; Optics; Phasors; Physics; Relaxation oscillations and long pulse operation; Resonance; Resonant frequency; semiconductor lasers; Semiconductor lasers; laser diodes; Optical injection; Semiconductor lasers; Oscillation frequency; Theoretical study; Amplitude modulation; Relaxation oscillation; Frequency response; Injection locking; Experimental study
• ISSN: 0018-9197; 1558-1713
• DOI: 10.1109/JQE.2007.910450

The modulation response of injection-locked lasers has been carefully analyzed, theoretically and experimentally, with a focus on the strong optical injection regime. We derive closed-form solutions to the relaxation oscillation (resonance) frequency and damping term, as well as the low-frequency damping term, and discuss design rules for maximizing resonance frequency and broadband performance. A phasor model is described in order to better explain the enhancement of the resonance frequency. Experimental curves match closely to theory. Record resonance frequency of 72 GHz and broadband results are shown.