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

Journal Article · Sat Aug 01 00:00:00 EDT 1987 · IEEE J. Quant. Electron.; (United States)

DOI:https://doi.org/10.1109/JQE.1987.1073507· OSTI ID:6093934

Yamada, M; Nakaya, N; Funaki, M

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), Vol. QE-23:8
• Country of Publication: United States
• Language: English

Related Subjects

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