DD Transmissions using a Directly Modulated O-band DFB+R Laser targeting
LR Applications
Abstract
We experimentally demonstrate an O-band single-lane 200 Gb/s intensity
modulation direct detection (IM/DD) transmission system using a
low-chirp, broadband, and high-power directly modulated laser (DML). The
employed laser is an isolator-free packaged module with over 65-GHz
modulation bandwidth enabled by a distributed feedback plus passive
waveguide reflection (DFB+R) design. We transmit high baud rate signals
over 20-km standard single-mode fiber (SSMF) without using any optical
amplifiers and demodulate them with reasonably low-complexity digital
equalizers. We generate and detect up to 170 Gbaud non-return-to-zero
on-off-keying (NRZ-OOK), 112 Gbaud 4-level pulse amplitude modulation
(PAM4), and 100 Gbaud PAM6 in the optical back-to-back configuration.
After transmission over the 20-km optical-amplifier-free SSMF link, up
to 150 Gbaud NRZ-OOK, 106 Gbaud PAM4, and 80 Gbaud PAM6 signals are
successfully received and demodulated, achieving bit error rate (BER)
performance below the 6.25%-overhead hard-decision (HD)
forward-error-correction code (FEC) limit. The demonstrated results show
the possibility of meeting the strict requirements towards the
development of 200Gb/s/lane IM/DD technologies, targeting 800Gb/s and
1.6Tb/s LR applications.