Title :
A control loop which ensures high side-mode-suppression ratio in a tunable DBR laser
Author :
Woodward, S.L. ; Koch, T.L. ; Koren, U.
Author_Institution :
AT&T Bell Lab., Holmdel, NJ, USA
fDate :
5/1/1992 12:00:00 AM
Abstract :
The authors present a control loop which ensures single-mode operation of a tunable distributed-Bragg-reflector (DBR) laser. This control loop uses no external optics. The error signal is derived from an integrated detector which measures the light transmitted through the Bragg section. Using this signal to control the current to the Bragg section, the laser is tuned to where the side-mode-suppression ratio is high. This guarantees that the laser remains single-mode, even when modulated. This servo is capable of application in wavelength-division-multiplexed (WDM) systems.<>
Keywords :
distributed Bragg reflector lasers; frequency division multiplexing; laser modes; laser tuning; multiplexing equipment; semiconductor junction lasers; Bragg section; WDM; control loop; diode lasers; distributed-Bragg-reflector; error signal; high side-mode-suppression ratio; integrated detector; servo; single-mode operation; transmitted light measurement; tunable DBR laser; wavelength-division-multiplexed; Distributed Bragg reflectors; Gratings; Laser modes; Laser tuning; Optical control; Power generation; Power lasers; Reflectivity; Tunable circuits and devices; Wavelength division multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
