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Characteristics of mode-hopping noise and its suppression with the help of electric negative feedback in semiconductor lasers

Journal Article · · IEEE J. Quant. Electron.; (United States)
; ;

Some detailed properties of mode-hopping noise in semi-conductor injection lasers are reported, and the validity of electric negative feedback as a method of suppressing the noise is demonstrated. Mode-hopping noise was found to be an intrinsic property of the laser, independent of optical feedback (reinjection of the output light) reflected at the surface of an external device. The optical feedback works to shift the operating point of the laser from a stable condition having single-mode operation to an unstable condition revealing the mode-hopping phenomena. Characteristics of the mode-hopping noise support well the theoretical analysis in which the source of the noise is assumed to be fluctuations of the emission and the electron wave accompanied by spontaneous emission and in which the noise is amplified through mechanism of the mode competition phenomena. Mode-hopping noise was suppressed with the help of the electric negative feedback from the optical detector to the injection current source more effectively than by another reducing method of superposition of the high-frequency current. The suppressed noise level was lower than that at stable single-mode operation.

Research Organization:
Dept. of Electrical and Computer Engineering, Faculty of Technology, Kanazawa Univ., Kodatsuno, Kanazawa 920
OSTI ID:
6093934
Journal Information:
IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. QE-23:8; ISSN IEJQA
Country of Publication:
United States
Language:
English

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Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
AMPLIFICATION
CURRENTS
ELECTRIC CURRENTS
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
EMISSION
ENERGY-LEVEL TRANSITIONS
FEEDBACK
FERMIONS
LASER RADIATION
LASERS
LEPTONS
MODE SELECTION
NOISE
OPERATION
RADIATIONS
REFLECTION
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
STABILITY
STIMULATED EMISSION