Effect of Chirped Dispersion and Modal Partition Noise on Multimode VCSEL Encoded with NRZ-OOK and PAM-4 Formats
Journal
IEEE Journal of Selected Topics in Quantum Electronics
Journal Volume
28
Journal Issue
1
Date Issued
2022
Author(s)
Abstract
Chirp-dispersion and data transmission analyses of the multimode vertical-cavity surface-emitting laser (MM-VCSEL) with a 7.5-μm oxide-confined aperture and a root-mean-square spectral linewidth of 1 nm is performed for intra-data-center application. For directly modulating the non-return-to-zero on-off keying (NRZ-OOK) and the 4-level pulse amplitude modulation (PAM-4) data streams, an optimized bias current of 17 mA and a data amplitude of 800 mV are selected to provide the MM-VCSEL with an output optical power of 6.1 mW and a transverse mode number of 17. Such an optimized operation enables the MM-VCSEL with a differential resistance of 45.3 Ω to approach the impedance matching by driving the circuit such that the -3-dB bandwidth can be achieved to 23.8 GHz. The relative intensity noise and mode-partition-noise of the MM-VCSEL are analyzed to perform the optimized NRZ-OOK/PAM4 data encoding. By utilizing the pre-emphasis technique to compensate for the intensity and phase variation, the encoded NRZ-OOK and PAM-4 can be respectively promoted to 61 Gbit/s and 96 Gbit/s in the back-to-back (BtB) case. After passing through the 100-m OM5 multi-mode-fiber (MMF) link to suffer the severe modal dispersion, the data rate would respectively degrade to 45 Gbit/s (or 4.5 Gbit·km/s) and 70 Gbit/s (or 7 Gbit·km/s) for OOK and PAM-4 transmission. ? 1995-2012 IEEE.
Subjects
Mode-partition-noise
Multimode fiber (OM5-MMF)
Multimode vertical cavity surface emitting laser (MM-VCSEL)
Relative intensity noise
Amplitude shift keying
Data streams
Dispersions
Pulse amplitude modulation
Transmissions
Differential resistances
Modal dispersion
Mode partition noise
Optimized operations
Phase variation
Root Mean Square
Spectral line width
Surface emitting lasers
SDGs
Type
journal article