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An optical frequency comb generated by an InAs/InP quantum-dash-based passively mode-locked laser spans ∼1.5 THz with 25 GHz spacing, and less than 100 kHz optical linewidth for all lines.
We demonstrate coherent WDM transmission using a pair of quantum-dash mode-locked laser-diodes — one to generate a multitude of optical carriers, and another to generate a multitude of LO tones. We transmit a line rate of 4 Tbit/s (23×45 GBd PDM-QPSK) over 75 km.
We demonstrate coherent WDM transmission using a quantum-dash mode-locked laser diode with resonant feedback. We report a line rate of 12 Tbit/s (32QAM 60×20 GBd PDM) over 75 km SMF. The spectral efficiency is 7.5 bit/s/Hz.
A fiber coupled terahertz time-domain spectroscopy (THz TDS) system which is driven by a pulsed monolithic semiconductor laser is presented. A bandwidth of over 0.6 THz with a signal to noise ratio (SNR) of 45 dB has been achieved at a wavelength of 1550 nm. This concept could pave the way towards ultra-compact and low-cost THz TDS systems.
We present a regular fiber based THz spectrometer, which is driven by a monolithic semiconductor laser. Clean THz pulses with frequency components up to 0.9 THz can be generated with this ultra-compact light source.
We demonstrate Tbit/s transmission with a Q-Dash mode-locked laser using coherent detection. The aggregate capacity achieved with PDM-QPSK was 1.8Tb/s over 50km of SSMF, using 36 channels from the 34.5GHz FSR Q-Dash PMLL.
InAs/ InP quantum dash based mode locked lasers are particularly suited for frequency comb generation. Multi-terabit/s data transmission has been achieved using one single chip.
By comparison to a stable reference laser, the phase noise of a frequency comb from a quantum-dash mode-locked laser can be compensated. The quality of the resulting carriers allows the transmission of data at a rate of 1 Tbit/s in a single polarization over a distance of 75 km using a standard forward error correction.
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.
An optical frequency comb generated by an InAs/InP quantum dash based passively mode-locked laser is investigated. The comb spans ~1.1THz, with 110 modes spaced by ~10GHz, and shows a long-term stability of 3x10-9 over 1000s.
Unprecedented high modal gain of ~100 cmµ1 is obtained for an optimized structure based on InAs/InP quantum dashes (QDash) emitting at 1.55 µm. This structure allows achieving ~10 GHz direct modulation bandwidth. P-type doping reduces the Henry factor value down to 2.7.
We report for the first time the passive mode-locking of single section Fabry-Perot (FP) lasers based on InAs quantum dots grown on (113)B InP substrate. Devices under study are a 1 and 2 mm long laser diodes emitting around 1.58 µm. Self-starting pulses with repetition rates around 39 and 23 GHz and pulse widths down to 1.5 ps are observed after propagation through a suitable length of single-mode...
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...
Pulse generation from single-section Fabry-Pérot InAs/GaAs edge-emitting quantum dot lasers is reported at 1.3μm. Mode-locking performances of the devices are studied as function of injection current and optical spectrum shape.
We report original results on GSMBE grown InAs/InP QD structures. Three single section devices show passive mode locking from 20 GHz to 83 GHz with low RF spectral width (32 kHz) and low pulse duration of 1.3 ps. We report also a double wavelength emission at high injection current, associated with degradation of mode locking properties. The real cause of these phenomena is still unclear.
High speed transmissions up to 20Gb/s are reported using 1.55µm InP-based Quantum Dashes distributed feedback lasers. Combining a directly modulated laser with an etalon filter, we demonstrate uncompensated and non-amplified SMF 10Gb/s transmissions at a constant bias current from back-to-back up to 65km with extinction ratio as large as 8dB. This result opens the way to the implementation of low...
Material growth optimization of InAs/InP quantum dashes has allowed the achievement of single section mode-locked lasers with improved performance in terms of modal gain > 40 cm−1, average output power > 40 mW, radio frequency linewidth as narrow as 10 kHz together with a direct modulation bandwidth over 7 GHz. These devices were subsequently investigated as potential optical transmitters for...
In this paper we report a 40 Gb/s operation of Remote Amplified Modulator at the temperature up to 85°C within the C- and L-band spectral ranges. The presented device was fabricated using an indium phosphide (InP) monolithic integration platform which relies on AlGaInAs quantum well active material, gap engineering by Selective Area Growth and low-parasitic RC semi-insulating buried heterostructures...
Optical Frequency Combs are becoming increasingly important for the development of future photonics systems. In this work we present the detailed characterization of optical frequency combs that can be employed in future supechannel Tbit/s transmission systems.
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