Up to 182GBd PAM-4 optical interconnects eliminating receiver-side DSP
Optics Letters,
Journal Year:
2025,
Volume and Issue:
50(7), P. 2263 - 2263
Published: Feb. 25, 2025
The
rapid
development
of
artificial
intelligent
clusters
and
computing
networks
demands
solutions
with
minimized
power
consumption
latency
to
scale
effectively.
Traditionally,
high-speed
intensity
modulation
direct
detection
(IM/DD)
optical
interconnects
rely
heavily
on
digital
signal
processing
(DSP),
leading
substantial
high
latency.
In
this
work,
we
utilize
a
broadband
thin-film
lithium
niobate
(TFLN)
Mach-Zehnder
modulator
(MZM)
chip
compare
performance
differences
between
linear
receive
optics
(LRO)
fully
DSP
solutions.
We
demonstrate
the
elimination
receiver-side
equalization
DSP,
achieving
generation
154
GBd
PAM4
190
OOK
signals,
both
bit-error
rates
(BERs)
well
below
KP4-FEC
decision
threshold.
Additionally,
up
182
is
transmitted
over
150
m
standard
single-mode
fiber,
196
generated
while
maintaining
BER
20%
soft-decision
forward
error
correction
(SD-FEC)
This
approach
drastically
reduces
latency,
high-bandwidth
devices
retain
ensure
broad
interoperability.
Language: Английский
End-to-end learning strategy with channel-aided polar based autoencoder in IM/DD optical interconnection
Optics Express,
Journal Year:
2024,
Volume and Issue:
32(22), P. 39727 - 39727
Published: Oct. 7, 2024
An
end-to-end
(E2E)
learning
strategy
with
a
channel-aided
polar
autoencoder
(AE)
is
proposed
and
experimentally
demonstrated
in
an
intensity-modulation
direct-detection
optical
interconnection
system.
With
the
global
training
of
E2E
deep
neural
network,
learned
fiber
channel
transceiver
characteristics
are
used
to
back-forward
aid
indexes
AE,
thus
obtaining
optimal
polarization
weight
encoding
mitigate
signal
impairments.
The
experimental
results
reveal
that
when
50
GBaud
PAM4
signals
transmitted
over
standard
single
mode
fiber,
AE
by
can
effectively
improve
received
power
sensitivity
1.5
dB
under
conditions
overall
adaptation
system
parameters
optimization.
Language: Английский
Low-cost EML-based O-band 112-GBaud PAM8 transmission over 10-km SSMF with a 4-bits DAC and a 5-taps FFE receiver
Optics Letters,
Journal Year:
2024,
Volume and Issue:
49(23), P. 6605 - 6605
Published: Oct. 30, 2024
The
increasing
traffic
of
intra-data
center
networks
creates
an
urgent
demand
for
low-cost
and
high-speed
intensity
modulation/direct
detection
(IM/DD)
transmission.
In
this
Letter,
we
propose
a
joint
scheme
combining
nonlinear
lookup
table
(NL-LUT)
pre-distortion,
digital
pre-emphasis
(DPE),
resolution
enhancer
(DRE)
to
achieve
IM/DD
optical
links
using
low-resolution
digital-to-analog
converter
(DAC).
NL-LUT
DPE
are
responsible
the
system
impairments
channel
attenuation
at
high
frequency,
respectively,
while
DRE
handles
quantization
noise
(QN)
caused
by
peak-to-average
ratios
(PAPRs)
DAC.
Leveraging
advanced
pre-compensation
transmitter,
experimentally
demonstrate
O-band
transmission
124
GBaud
112
PAM8
over
2
km
10
SSMF,
only
4
bits
DAC
simple
5-tap
linear
equalizer
receiver-side.
To
best
our
knowledge,
among
reported
demonstrations
without
amplifier,
work
achieves
highest
net
rates
310
Gb/s
280
which
offers
promising
solution
Language: Английский