Abstract
We report on the design, growth, fabrication, and performance of InAs/InP quantum dash (QD) multi-wavelength lasers (MWLs) developed by the National Research Council (NRC) Canada. The key technical specifications investigated include optical and RF beating spectra, relative intensity noise (RIN), and optical phase noise of each individual wavelength channel. Data bandwidth transmission capacity of 5.376 Tbit/s and 10.8 Tbit/s respectively in the PAM-4 and 16-QAM modulation formats are demonstrated using only a single C-band QD 34.2-GHz MWL chip. We have also developed a monolithic InAs/InP QD dual-wavelength (DW) DFB laser as a compact optical beat source to generate millimeter-wave (MMW) signals. Due to the common cavity, highly coherent and correlated optical modes with optical linewidth as low as 15.83 kHz, spectrally pure MMW signals around 46.8 GHz with a linewidth down to 26.1 kHz were experimentally demonstrated. By using this QD DW-DFB laser, a one GBaud (2 Gbps) MMW over-fiber transmission link is demonstrated with PAM-4 signals. The results show that the demonstrated device is suitable for high speed high capacity MMW fiber-wireless integrated fronthaul of 5G networks.
Highlights
Over the past years many experiments have demonstrated the huge potential of using optical multiwavelength lasers (MWLs) for data transmission at terabit rates [1,2,3]
A clear eye diagram of Four-level pulse amplitude modulation (PAM-4) signals of one GBaud transmission bandwidth along with transmitted / received signals were measured using Tektronix digital phosphor real-time oscilloscope. These results indicate the promising applications of the demonstrated Quantum dot and dash (QD) DW-distributed feedback (DFB) laser as a compact mm-wave optical beat source in heterodyne mm-wave communication systems of 5G and beyond wireless networks
By employing 48 wavelength channels as optical carriers, 5.4 Tbit/s PAM-4 aggregate data transmission capacity is demonstrated with the base modulation rate of 28 GBaud over 25 km standard single mode fiber (SSMF)
Summary
Over the past years many experiments have demonstrated the huge potential of using optical multiwavelength lasers (MWLs) for data transmission at terabit rates [1,2,3].
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