Abstract
We report optical injection-locking in 21-GHz single-section and two-section InAs/InP 1.5-$\mu\hbox{m}$ quantum-dash mode-locked lasers. Two distinct mode-locked regimes were observed and successfully locked to the optically injected light. The single-section laser only operates as a self-mode-locked laser while the two-section laser could operate as both a self-mode-locked laser and saturable-absorber dominated mode-locked laser. The continuous-wave (CW) injection-locked self-mode-locked laser shows wide tuning of the mode-locked frequency (270 MHz) within the locking range. The CW injection-locked saturable-absorber dominated mode-locked laser demonstrates wide optical spectrum, and 5.5 reduction in the time-bandwidth product of the pulses. Using dual-mode injection, strong reduction of timing jitter ($\approx$235 fs) is possible leading to the generation of a wide coherent frequency comb. Coherence between all the modes and the master laser is confirmed by measuring the RF beat note of each mode with a narrow linewidth laser.
| Original language | English |
|---|---|
| Article number | 5978182 |
| Pages (from-to) | 1544-1546 |
| Number of pages | 3 |
| Journal | IEEE Photonics Technology Letters |
| Volume | 23 |
| Issue number | 20 |
| DOIs | |
| Publication status | Published - 11 Oct 2011 |
Keywords
- Injection-locked oscillators
- microwave oscillators
- mode-locked lasers
- optical frequency combs
- quantum-dash lasers