IEEE Transactions on Communications,
Год журнала:
2024,
Номер
72(8), С. 4992 - 5002
Опубликована: Март 25, 2024
We
demonstrate
a
probabilistic
shaping
(PS)
four-dimensional
(4D)
modulation
in
self-homodyne
coherent
transmission
system.
The
4D
is
based
on
inter-symbol
amplitude
translation
(AT)
to
perform
set
partitioning.
distribution
of
constellation
points
after
AT
optimized
by
de-DC.
parity
bits
produced
the
are
transmitted
with
pilot
tone
remapping.
In
addition,
soft
decision
for
this
4D-PS
signal
proposed.
An
experiment
ultra-high
order
two
cores
7-core
fiber
demonstrated
spectral
efficiency
16.37
bit/s/Hz.
signals
can
provide
up
0.78
bit/symbol
and
1.85
gain
compared
normal
polarization
division
multiplexing
hard-decision
signals.
Proceedings of the IEEE,
Год журнала:
2022,
Номер
110(11), С. 1821 - 1834
Опубликована: Окт. 12, 2022
Four-mode
multiplexing
and
manipulation
technologies
are
reviewed
in
the
context
of
space-division
(SDM)
optical
communication
systems.
These
multiplane
light
conversion
(MPLC),
fused
fiber
devices,
such
as
photonic
lanterns
tapered
bundles,
3-D
waveguides
fabricated
using
ultrafast
laser
inscription,
free-space
imaging
Each
device
has
its
unique
strengths
use
cases.
MPLC
can
create
very
complex
transformations
between
two
arbitrary
sets
spatial
modes
leverages
mature
gray-scale
lithographic
techniques.
Photonic
bundles
all-fiber
devices
that
convert
beams
on
single-mode
inputs
into
modes.
The
construction
leads
to
low
losses
high-power
handling.
inscribed
a
glass
block
ultrashort
lasers
arbitrarily
route
3-D.
Finally,
systems
lenses
also
relay
many
multicore
multimode
through
single
device,
thin
film
filter
or
an
isolator.
four
have
enabled
hero
transmission
experiments
multimode,
multicore,
fiber.
Proceedings of the IEEE,
Год журнала:
2022,
Номер
110(11), С. 1835 - 1852
Опубликована: Ноя. 1, 2022
Forthcoming
capacity
scaling
requirements
of
optical
networks
and
advances
in
fiber
communications
beyond
the
omnipresent
single-mode
operating
over
conventional
band
introduces
new
opportunities
challenges
for
exploiting
expanded
spectral
spatial
resources
available
fiber-optic
network
designs.
The
degrees
freedom
introduce
utilization
tradeoffs
that
can
be
leveraged
under
different
applications.
After
briefly
reviewing
supporting
building
elements
(emerging
types,
multiplexers,
switches,
amplifiers),
we
consider
networking
scenarios
such
as
intra/inter
datacenter,
terrestrial,
undersea,
wireless
5G/6G
hauling
identify
best
plan
key
attributes
harnessed
by
offered
each
scenario
how
switching
employed
therein
traffic
management.
Networks
these
are
experiencing
tremendous
growth
pushing
their
existing
implementations
to
physical
capacity-distance
limits.
New
builds
must
offer
significant
multipliers
an
efficient
cost-effective
manner,
requiring
solutions
unabated
growths
foreseen
years
come.
We
discuss
space-division
multiplexed
help
address
this
challenge
communication
scenarios.
Science,
Год журнала:
2023,
Номер
380(6642), С. 278 - 282
Опубликована: Апрель 20, 2023
Spatial
mode-count
scalability
in
optical
fibers
is
of
paramount
importance
for
addressing
the
upcoming
information-capacity
crunch,
reducing
energy
consumption
per
bit,
and
enabling
advanced
quantum
computing
networks,
but
this
severely
limited
by
perturbative
mode
mixing.
We
show
an
alternative
means
light
guidance,
which
light's
orbital
angular
momentum
creates
a
centrifugal
barrier
itself,
thereby
low-loss
transmission
conventionally
forbidden
regime
wherein
mixing
can
be
naturally
curtailed.
This
enables
kilometer-length-scale
record
~50
modes
with
cross-talk
as
low
-45
decibels/kilometer
areas
~800
square
micrometers
over
130-nanometer
telecommunications
spectral
window.
distinctive
light-guidance
promises
to
substantially
increase
information
content
photon
or
classical
networks.
Advanced Photonics Nexus,
Год журнала:
2024,
Номер
3(01)
Опубликована: Янв. 3, 2024
Mode-division
multiplexers
(MDMUXs)
play
a
pivotal
role
in
enabling
the
manipulation
of
an
arbitrary
optical
state
within
few-mode
fibers,
offering
extensive
utility
fields
mode-division
multiplexing
and
structured
field
engineering.
The
exploration
MDMUXs
employing
cascaded
resonant
couplers
has
garnered
significant
attention
owing
to
their
scalability,
exceptional
integration
capabilities,
anticipated
low
insertion
loss.
In
this
work,
we
present
successful
realization
high-quality
orbital
angular
momentum
MDMUX
corresponding
topological
charges
0,
±1,
±2,
achieved
through
utilization
fused-biconical
tapered
couplers.
Notably,
measured
losses
at
1550
nm
exhibit
remarkable
minimal
values:
0.31,
0.10,
0.64
dB,
respectively.
Furthermore,
80%
efficiency
bandwidths
exceed
106,
174,
174
for
these
respective
modes.
is
composed
precision-manufactured
mode
selective
(MSCs).
Utilizing
proposed
supermode
propagation
method
based
on
composition
analysis,
precisely
describe
operational
characteristics
MSCs.
Building
upon
comprehensive
understanding,
embark
pioneering
analysis
elucidating
influence
MSC
cascading
order
performance
MDMUXs.
Our
theoretical
investigation
substantiates
that
when
constructing
MDMUXs,
MSCs
should
adhere
specific
sequence.
IEEE Transactions on Communications,
Год журнала:
2024,
Номер
72(8), С. 4992 - 5002
Опубликована: Март 25, 2024
We
demonstrate
a
probabilistic
shaping
(PS)
four-dimensional
(4D)
modulation
in
self-homodyne
coherent
transmission
system.
The
4D
is
based
on
inter-symbol
amplitude
translation
(AT)
to
perform
set
partitioning.
distribution
of
constellation
points
after
AT
optimized
by
de-DC.
parity
bits
produced
the
are
transmitted
with
pilot
tone
remapping.
In
addition,
soft
decision
for
this
4D-PS
signal
proposed.
An
experiment
ultra-high
order
two
cores
7-core
fiber
demonstrated
spectral
efficiency
16.37
bit/s/Hz.
signals
can
provide
up
0.78
bit/symbol
and
1.85
gain
compared
normal
polarization
division
multiplexing
hard-decision
signals.
