Title :
A 1.54- mu m monolithic semiconductor ring laser: CW and mode-locked operation
Author :
Hansen, P.B. ; Raybon, G. ; Chien, M.-D. ; Koren, U. ; Miller, B.I. ; Young, M.G. ; Verdiell, J.-M. ; Burrus, C.A.
Author_Institution :
AT&T Bell Lab., Holmdel, NJ, USA
fDate :
5/1/1992 12:00:00 AM
Abstract :
The authors have fabricated a monolithic semiconductor ring laser with a diameter of 3.0 mm. A straight tangent waveguide provides two output ports through evanescent coupling. The laser, which exhibits a threshold current of 157 mA, operates in a single longitudinal mode with a linewidth of 900 kHz at a wavelength of 1.54 mu m. The device has been actively mode-locked at the fundamental resonance frequency of 9.0 GHz, yielding 27-ps pulses with a time-bandwidth product of 0.47. Differences in the characteristics of the pulses emitted from the two output ports indicate counterpropagating pulse trains, which because of the mode-locking scheme must collide in the modulated gain section.<>
Keywords :
laser mode locking; optical modulation; ring lasers; semiconductor junction lasers; spectral line breadth; 1.54 micron; 157 mA; 27 ps; 3 mm; 9 GHz; IR; actively mode-locked; colliding laser pulses; counterpropagating pulse trains; diode lasers; evanescent coupling; fundamental resonance frequency; linewidth; mode-locked operation; modulated gain section; monolithic semiconductor ring laser; output ports; single longitudinal mode; straight tangent waveguide; threshold current; time-bandwidth product; Laser mode locking; Laser modes; Pulse modulation; Resonance; Resonant frequency; Ring lasers; Semiconductor lasers; Semiconductor waveguides; Threshold current; Waveguide lasers;
Journal_Title :
Photonics Technology Letters, IEEE
