Locking conditions and stability properties for a semiconductor laser with external light injection

Journal Article · Mon Jul 01 00:00:00 EDT 1985 · IEEE J. Quant. Electron.; (United States)

DOI:https://doi.org/10.1109/JQE.1985.1072760· OSTI ID:5950812

Mogensen, F; Jacobsen, G; Olesen, H

We present a theoretical and experimental investigation of injection locking of semiconductor lasers. The theoretical analysis takes into account the dependence of refractive index on the carrier density expressed by the linewidth enhancement factor ..cap alpha... Locking conditions and dynamic stability are analyzed. The nonzero value of ..cap alpha.. results in an increased locking bandwidth, where only part of the range corresponds to a dynamically stable state. Asymmetric characteristics are obtained for the locked power and phase as a function of frequency detuning between the master and slave laser. Outside the stable range, light injection gives rise to beat phenomena and intensity pulsations. The theoretical results were confirmed by experiments on 830 nm CSP lasers and 1.3 ..mu..m BH lasers. The experiments include the first measurements of locking bandwidth characteristics reported for 1.3 ..mu..m lasers. Power spectra are recorded under locked and near-locked conditions and compared with theory. The 1.3 ..mu..m lasers are found to have a better dynamic stability than 830 nm lasers. Even so, the stability problems may exclude the particular application of injection locking where phase modulation is generated for coherent transmission.

• Research Organization: Electromagnetics Institute, Technical University of Denmark, Lyngby
• OSTI ID: 5950812
• Journal Information: IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. QE-21:7; ISSN IEJQA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
COHERENT RADIATION
ELECTROMAGNETIC RADIATION
ENERGY SPECTRA
INFRARED RADIATION
LASERS
MODE LOCKING
MODULATION
OPTICAL PROPERTIES
OPTICAL PUMPING
PHASE SHIFT
PHASE STABILITY
PHYSICAL PROPERTIES
PUMPING
RADIATIONS
REFRACTIVITY
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
SPECTRA
STABILITY
WAVELENGTHS