Reflection noise in index-guided InGaAsP lasers
The authors report a detailed study of the excess noise induced in index-guided InGaAsP laser structures by reflection feedback. The phenomena of high-frequency noise (1-5 GHz), low-frequency noise (< 100 MHz), and intensity fluctuations are shown to have a common physical origin in the unusual instability of the coupled laser-external cavity system. After a randomly occurring light intensity drop, the light output recovers in 10-15 steps, each corresponding to an external cavity roundtrip (high-frequency noise); the total recovery time corresponds to the low-frequency noise. The instability, and the subsequent noise, can be suppressed under conditions of very strong feedback such as obtained for lasers with anti-reflection-coated facets. The reflection noise characteristics are shown to be largely independent of the laser structure and structure modifications such as distributed feedback.
- Research Organization:
- AT and T Bell Labs., Murray Hill, NJ 07974
- OSTI ID:
- 6081095
- Journal Information:
- IEEE J. Quant. Electron.; (United States), Vol. QE-22:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SEMICONDUCTOR LASERS
NOISE
PERFORMANCE
REFLECTION
ANTIREFLECTION COATINGS
FEEDBACK
FLUCTUATIONS
GALLIUM ARSENIDES
GALLIUM PHOSPHIDES
GHZ RANGE 01-100
INDIUM ARSENIDES
INDIUM PHOSPHIDES
INSTABILITY
LASER CAVITIES
MHZ RANGE 01-100
TIME DEPENDENCE
ARSENIC COMPOUNDS
ARSENIDES
COATINGS
FREQUENCY RANGE
GALLIUM COMPOUNDS
GHZ RANGE
INDIUM COMPOUNDS
LASERS
MHZ RANGE
PHOSPHIDES
PHOSPHORUS COMPOUNDS
PNICTIDES
SEMICONDUCTOR DEVICES
VARIATIONS
420300* - Engineering- Lasers- (-1989)