A 1.54-micron monolithic semiconductor ring laser - CW and mode-locked operation
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 microns. 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.
- Publication:
-
IEEE Photonics Technology Letters
- Pub Date:
- May 1992
- DOI:
- 10.1109/68.136469
- Bibcode:
- 1992IPTL....4..411H
- Keywords:
-
- Continuous Wave Lasers;
- Infrared Lasers;
- Integrated Circuits;
- Laser Mode Locking;
- Ring Lasers;
- Semiconductor Lasers;
- Indium Gallium Arsenides;
- Indium Phosphides;
- Optical Waveguides;
- Picosecond Pulses;
- Threshold Currents;
- Lasers and Masers