Optics Express,
Год журнала:
2024,
Номер
32(21), С. 37148 - 37148
Опубликована: Сен. 24, 2024
Driven
by
the
ever-increasing
capacity
demands,
digital
signal
processing
(DSP)
has
been
first
applied
to
improve
performance
of
a
50G
passive
optical
network
(PON).
The
main
challenge
is
implementing
burst-mode
DSP
deal
with
upstream
burst
signal.
This
paper
proposes
using
preambles
designed
for
PON
based
on
entropy-loading
discrete
multi-tone
(DMT).
mainly
includes
timing
recovery
initial
offset
and
frequency-domain
equalizer
tap
coefficients.
experimental
results
DMT
demonstrate
that
can
achieve
fast
convergence
∼27ns
preamble
800
samples.
proposed
makes
highly
feasible
support
non-residential
point-to-multi-point
applications
such
as
local
area
networks.
Journal of Lightwave Technology,
Год журнала:
2024,
Номер
42(4), С. 1193 - 1202
Опубликована: Янв. 18, 2024
To
cope
with
the
explosive
bandwidth
demand,
significant
progress
has
been
made
in
ITU-T
standardization
sector
to
define
a
higher-speed
passive
optical
network
(PON)
50
Gb/s
line
rate.
Recently,
G
PON
become
mature
gradually,
which
means
it
is
time
discuss
beyond
PON.
For
ensuring
an
acceptable
power
budget,
will
potentially
use
coherent
technologies,
can
simultaneously
promote
applications
of
flexible
multiple
access
such
as
time/frequency-domain
(TFDMA).
In
this
paper,
we
introduce
architectures,
algorithms,
and
demonstrations
for
TFDMA-based
The
system
architectures
based
on
ultra-simple
transceiver
specific
signal
spectra
are
designed
reduce
cost
ONUs
greatly.
Meanwhile,
continuous-mode
burst-mode
digital
processing
(DSP)
algorithms
proposed
dealing
downstream
upstream
signals,
respectively.
Based
experimentally
demonstrate
first
real-time
where
Gb/(s
×
subcarrier)
continuous
12.5
burst
processed
real
time.
Owing
independent
subcarrier
processing,
potential
support
peak
rates
200
(i.e.
four
subcarriers)
100
eight
subcarriers).
Significantly,
have
sufficiently
verified
by
demonstrations.
conclusion,
technologies
make
more
possible
be
applied
future
Journal of Lightwave Technology,
Год журнала:
2024,
Номер
42(16), С. 5440 - 5449
Опубликована: Фев. 15, 2024
We
propose
a
novel
rate
flexible
coherent
passive
optical
network
(PON)
that
features
low
complexity
burst
frame
detection
scheme
to
achieve
modulation
format
selection.
The
proposed
algorithm,
along
with
preamble
design
for
different
formats
are
studied
in
detail.
In
laboratory
experiment
setting,
the
method
allows
an
automated
digital
signal
processing
(DSP)
workflow
supports
wide
range
of
formats.
Using
scheme,
two
innovative
rate-flexible
PON
architectures
have
been
and
experimentally
demonstrated.
One
time-division
multiplexing
(TDM)
three
both
downstream
upstream
transmission,
other
uses
frequency
comb-based
multi-wavelength
source
broadcasting
TDM
upstream.
experiments,
25-GBd
dual-polarization
quadrature
phase
shift
keying
(DP-QPSK),
16
amplitude
(DP-16QAM),
64
(DP-64QAM)
were
examined.
A
peak
data
up
300
Gb/s
transmission
over
50
km
fiber
optic
link
split
ratio
1×32
achieved,
Tx
power
+5
dBm,
Rx
around
-20
dBm.
Optical Fiber Communication Conference (OFC) 2022,
Год журнала:
2023,
Номер
unknown, С. Th4C.4 - Th4C.4
Опубликована: Янв. 1, 2023
We
demonstrate
the
first
real-time
TFDMA
coherent
PON
system
with
single-DAC
and
single-ADC
ONUs,
which
can
support
up
to
256
end
users,
peak
line
rates
of
100/200
Gb/s
in
upstream/downstream,
respectively.
Chinese Optics Letters,
Год журнала:
2024,
Номер
22(4), С. 040604 - 040604
Опубликована: Янв. 1, 2024
Increasing
bandwidth
requirements
have
posed
significant
challenges
for
traditional
access
networks.
It
is
difficult
intensity
modulation/direct
detection
to
meet
the
power
budget
and
flexibility
of
next-generation
passive
optical
network
(PON)
at
100G
beyond
considering
new
requirements.
This
driving
researchers
develop
novel
technologies.
Low-cost,
wide-coverage,
high-flexibility
coherent
PON
emerging
as
a
strong
contender
in
competition.
In
this
article,
we
will
review
technologies
that
reduce
complexity
(CPON),
enabling
it
commercial
Also,
advanced
algorithms
architectures
can
enhance
system
coverage
are
also
discussed.
Journal of Optical Communications and Networking,
Год журнала:
2023,
Номер
16(1), С. 4 - 4
Опубликована: Ноя. 16, 2023
Beyond
100G
passive
optical
networks
(PONs)
will
be
required
to
meet
the
ever-increasing
traffic
demand
in
future.
Coherent
technologies
are
competitive
solutions
for
future
beyond
PON
but
also
face
challenges
such
as
high
computational
complexity
of
digital
signal
processing
(DSP).
A
oversampling
rate
coherent
results
DSP.
Therefore,
DSP
running
a
non-integer-oversampling
below
2
samples-per-symbol
(sps)
is
preferred,
which
can
not
only
reduce
obviously
lower
requirement
analog-to-digital
converter.
In
this
paper,
we
propose
meeting
requirements
PON.
Complexities
complex-valued
multiplication
proposed
working
at
9/8-sps
and
5/4-sps
rates
reduced
by
44.04%
40.78%
compared
that
2-sps
rate,
respectively.
400-Gb/s-net-rate
based
on
subcarrier
multiplexing
was
demonstrated
verify
feasibility
There
almost
no
penalty
receiver
sensitivity
when
adopted.
conclusion,
shows
great
potential
Journal of Lightwave Technology,
Год журнала:
2024,
Номер
42(4), С. 1312 - 1320
Опубликована: Фев. 6, 2024
The
coherent
passive
optical
network
(PON)
is
a
promising
solution
for
the
next
generation
of
high-speed
access
network,
capable
supporting
100G
and
beyond
data
rate.
Moreover,
flexibility
adaptability
PON
(CPON)
have
attracted
increasing
interest.
A
flexible
can
enhance
system
throughput
through
adaptive
modulation
formats,
baud
rates,
coding
techniques.
One
critical
challenge
adaptive-modulation
CPON
need
fast-tracking
channel
status,
particularly
downstream
transmission.
This
important
as
signals
with
different
formats
are
continuous
in
In
present
study,
we
proposed
experimentally
demonstrated
pilot-aided
digital
signal
processing
(DSP)
scheme
300
G
based
on
4/16/64-QAMs,
which
avoids
burst-signal
transmission
during
modulation-format
switching.
pilot
symbols
that
insert
enable
tracking
state-of-polarization,
finite
impulse
response
(FIR)
coefficients
equalization,
carrier
phase.
feasibility
DSP
was
verified
four
cases
involving
formats.
As
proof
concept,
achieved
detection,
enabling
100-300
We
total
power
budgets
38,
30,
20
dB
25-GBaud
polarization-division-multiplexed
(PDM)
4/16/64-QAM
after
20-km
single-mode
fiber
(SMF),
respectively.
Cryptography,
Год журнала:
2024,
Номер
8(2), С. 15 - 15
Опубликована: Апрель 19, 2024
Significant
advancements
have
been
achieved
in
the
field
of
quantum
computing
recent
years.
If
somebody
ever
creates
a
sufficiently
strong
computer,
many
public-key
cryptosystems
use
today
might
be
compromised.
Kyber
is
post-quantum
encryption
technique
that
depends
on
lattice
problem
hardness,
and
it
was
recently
standardized.
Despite
extensive
testing
by
National
Institute
Standards
Technology
(NIST),
new
investigations
demonstrated
effectiveness
CRYSTALS-Kyber
attacks
their
applicability
non-controlled
environments.
We
investigated
CRYSTALS-Kyber’s
susceptibility
to
side-channel
attacks.
In
reference
implementation
Kyber512,
additional
functions
can
compromised
employing
selected
ciphertext.
The
ciphertext
allows
succeed.
Real-time
recovery
entire
secret
key
possible
for
all
assaults.
Journal of Optical Communications and Networking,
Год журнала:
2024,
Номер
16(11), С. 1082 - 1082
Опубликована: Июль 26, 2024
In
this
paper,
we
propose
an
original
adaptive
neural
network
equalizer
(NNE)
algorithm
named
SkipNet,
which
is
suitable
for
rapid
training
on
a
packet-by-packet
basis
burst-mode
non-linear
equalization
in
upstream
PON
transmission.
SkipNet
uses
the
simple
LMS
and
avoids
complex
algorithms
such
as
backpropagation
mini-batch
training.
We
demonstrate
captured
continuous
mode
100
Gbit/s
PAM4
signals
using
SOA
preamplifier
to
achieve
challenging
29
dB
optical
loss
budget.
The
shown
overcome
combinations
of
severe
patterning
effects
fiber
dispersion
impairments
>29dB
dynamic
range
back-to-back
>22.9dB
up
81.6
ps/nm
accumulated
dispersion.
It
can
adapt
little
250
symbols
each
impairment
scenario,
equivalent
existing
FFE/DFE
solutions,
while
matching
performance
previously
proposed
static
NNE
solutions.
To
best
our
knowledge,
first
ever
framework
that
realistically
be
trained
adapted
within
strict
packet
preamble
lengths.