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We transmit 18 GBd 16QAM signals on 25 spectral lines of a quantum-dash mode-locked laser diode, achieving a 1.562 Tbit/s aggregate data rate. Phase noise is cancelled by self-homodyne detection using LO tones transmitted with the signal.
A feed-forward heterodyne scheme is shown to simultaneously reduce the phase noise of many comb lines from a quantum-dash mode-locked laser diode (QD-MLLD). This enables the first coherent data transmission using QD-MLLD as multi-wavelength source.
Mode-locking of single-section Fabry-Pérot lasers based on InAs/InP quantum dashes is studied by second-harmonic generation frequency-resolved optical gating (SHG-FROG). The devices take advantage of an optimized epitaxial structure with modal gain of 50 cm−1 showing a broad and flat emission spectrum of width in excess of 14 nm. Self-starting pulses of a width down to 430 fs are observed after intracavity...
We demonstrate ~860 fs pulse generation at a 21.31 GHz repetition rate using a two-section single quantum well mode-locked laser emitting at 1.54 mum. A very low 30 kHz linewidth of the radio frequency (RF) spectrum is reported.
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