Title :
Intermodal tuning characteristics of an InGaAsP laser with optical feedback from an external-grating reflector
Author :
Binder, Jann O. ; Cormack, George D. ; Somani, Azmina
Author_Institution :
Alberta Telecommun. Res. Centre, Edmonton, Alta., Canada
fDate :
7/1/1990 12:00:00 AM
Abstract :
A report is presented on the spectral characteristics of one-side antireflection coated 1.3-μm InGaAsP lasers exposed to strong feedback from an external grating, when the center wavelength of reflection of the grating is tuned continuously from one solitary laser longitudinal mode to the adjacent lower frequency mode. The effect of different residual reflectivities of the coated facet on the tuning characteristics of the laser was investigated experimentally. Bistability in the tuning characteristic is explained using a graphical representation of operating conditions. The stability of single-mode oscillation is found to depend on the offset between the resonance frequency of the solitary laser and the frequency of maximum reflection from the grating. An offset between the oscillation frequency of the laser and the frequency of maximum reflection from the grating is shown to occur
Keywords :
antireflection coatings; diffraction gratings; feedback; gallium arsenide; gallium compounds; indium compounds; laser accessories; laser modes; laser tuning; semiconductor junction lasers; 1.3 micron; InGaAsP laser; coated facet; external-grating reflector; intermodal laser tuning; maximum grating reflection frequency; one-side antireflection coated; optical bistability; optical feedback; oscillation frequency; residual reflectivities; resonance frequency; single-mode oscillation; solitary laser longitudinal mode; Frequency; Gratings; Laser feedback; Laser modes; Laser stability; Laser tuning; Optical bistability; Optical feedback; Optical reflection; Optical tuning;
Journal_Title :
Quantum Electronics, IEEE Journal of
