Title :
Observation of Harmonic-Mode-Locking in a Mode-Locked InAs/InP-Based Quantum-Dash Laser With CW Optical Injection
Author :
Sooudi, Ehsan ; Huyet, Guillaume ; McInerney, John G. ; Lelarge, François ; Merghem, Kamel ; Martinez, Anthony ; Ramdane, Abderrahim ; Hegarty, Stephen P.
Author_Institution :
Phys. Dept., Univ. Coll. Cork, Cork, Ireland
fDate :
5/1/2011 12:00:00 AM
Abstract :
We report tunable harmonic mode-locking in continuous-wave (CW) optically injected InAs/InP quantum-dash lasers emitting at 1.56 μm. The frequency of generated microwave pulses is twice the laser´s self-mode-locked frequency. Autocorrelation traces show Gaussian pulses with low time-bandwidth product ( ≈0.6). Mapping of the dynamics shows that this coherent microwave oscillation (MWO) region has maximum locking range ≈600 MHz (≈5 pm). Measurement of the optical linewidth of each individual mode at this regime shows strong narrowing relative to free running values by two orders of magnitude. The RF linewidth of the generated signal is ≈160 kHz confirming the coherence among the optical modes and low timing jitter.
Keywords :
Gaussian distribution; III-V semiconductors; indium compounds; laser mode locking; laser modes; laser tuning; light coherence; optical pulse generation; quantum dash lasers; timing jitter; CW optical injection; Gaussian pulses; InAs-InP; RF linewidth; autocorrelation traces; harmonic-mode-locking; microwave oscillation; microwave pulses; optical linewidth; quantum-dash laser; self-mode-locked frequency; timing jitter; wavelength 1.56 mum; Laser mode locking; Masers; Optical mixing; Optical pulses; Semiconductor lasers; Microwave oscillators; mode-locked lasers; optical injection; quantum-dash lasers;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2114338
