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InAs/InP Quantum-Dot Passively Mode-Locked Lasers for 1.55-μ m Applications

InAs/InP Quantum-Dot Passively Mode-Locked Lasers for 1.55-μ m Applications,10.1109/JSTQE.2011.2116772,IEEE Journal of Selected Topics in Quantum Elec

InAs/InP Quantum-Dot Passively Mode-Locked Lasers for 1.55-μ m Applications   (Citations: 1)
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This paper reports on recent results on passively mode-locked InAs/InP quantum-dot-based lasers. These low- dimensional structures have proved very attractive in improving most of the properties of these devices. Subpicosecond pulse gen- eration at repetition rates up to beyond 300 GHz has readily been demonstrated. Ultranarrow RF linewidths reach record values of less than 1 kHz. Controlled optical feedback allows a further re- duction of this linewidth yielding extremely low timing jitter. A comparison of single-section and standard two-section lasers is given for the first time. These performances open the way to vari- ous applications at 1.55 μm, including very high bit rate all-optical signal processing, frequency comb generation, radio over fiber, and low-noise all-optical oscillators.
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    • ...More recently, two-section, saturable-absorber dominated mode-locked lasers (SAMLL) with the same active region have generated ps pulses without the need for pulse compression, as well as a broad optical spectrum [7]...
    • ...The single and two-section InAs/InP quantum dash lasers were processed from the same wafer with the active region consisting of 9 InAs quantum dash layers in the InGaAsP m barriers (dash in a barrier structure) [7]...
    • ...A systematic study on the pulse characteristics and the RF linewidth of 48 GHz SMLL and SAMLLs could be found in [7]...
    • ...both cases, wide RF tuning ( 270 MHz) of the mode-locked frequencyinSMLLwasnoticeable.Thistuningrangewasmuch wider than values reported for feedback stabilization of such lasers [7]...
    • ...Another advantage of CW injection locking of SAMLL is reduction of the chirp in the pulseswhich was also observed in the free running 48 GHz SAMLLs [7]...
    • ...The timing jitter was calculated by integrating the single side-band phase noise spectra from 1–50 MHz range for free running and CW injection [7] and 20 kHz-50 MHz for dual-mode injection...
    • ...The timing jitter for the latter is lower than the record value of 400 fs reported for optimized quantum dash SMLLs at 10 GHz [7] and close to the value for dual- mode injection of 1.3 m quantum dot modelockedlasers[12].Thestableinjectionlockingwasobservedfor injection ratio –12%...

    Ehsan Sooudiet al. Injection-Locking Properties of InAs/InP-Based Mode-Locked Quantum-Das...

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