IEEE photonics journal,
Journal Year:
2024,
Volume and Issue:
16(2), P. 1 - 7
Published: Jan. 11, 2024
A
lithium
niobate
thin-film(LNTF)
electro-optic
modulator(EOM)
with
segmented
electrode
structure
is
investigated,
and
the
influence
of
modulator's
structural
configuration
on
its
performance
achieved.
In
contrast
to
conventional
couplers,
design
incorporates
a
2x2
S-shaped
directional
coupler.
Our
modulator
achieves
bandwidth
nearly
110
GHz
half-wave
voltage
1.45
Vcm.
comparative
analysis
between
two
configurations:
one
SiO
2
cladding
covering
entire
surface
other
coverage
limited
gaps,
which
reveals
latter
potential
for
enhancing
device
performance.
The
accuracy
simulation
results
substantiated
through
both
software
theoretical
calculations.
provide
valuable
insights
LNTF
EOM,
highlighting
efficacy
proposed
structure.
ACS Photonics,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 5, 2025
To
meet
the
growing
demand
for
high-frequency
and
broadband
wireless
communications,
extending
microwave
frequencies
to
millimeter-wave
range
is
essential.
Microwave
photonic
filters
(MPFs),
as
key
components
in
systems,
are
used
select
target
signals
reduce
channel
interference.
However,
achieving
MPFs
with
a
tuning
beyond
40
GHz
remains
challenging
due
limited
bandwidth
of
electro-optical
devices
optical
filters.
In
this
study,
we
demonstrate
reconfigurable
integrated
MPF
based
on
thin-film
lithium-niobate-on-insulator
platform.
The
achieves
widest
operational
from
2
62
tunable
frequency
resolution
0.7
3
GHz.
Additionally,
filter
enables
selection
Gbit/s
data
rates
communication,
offering
practical
scalable
solution
future
applications.
Photonics,
Journal Year:
2025,
Volume and Issue:
12(5), P. 452 - 452
Published: May 7, 2025
With
the
rapid
development
of
information
technology,
global
data
volume
has
been
continuously
expanding,
placing
unprecedented
demands
on
communication
networks
to
accommodate
precipitously
increasing
throughput.
Thin-film
lithium
niobate
(TFLN)
modulators,
characterized
by
their
large
theoretical
bandwidth,
low
half-wave
voltage,
and
suitability
for
high-density
integration,
show
great
application
potential
in
high-speed
optical
modules
interconnection
networks.
However,
persistent
issue
velocity
mismatch
between
radio
frequency
(RF)
signals
carriers
invariably
hinders
utilization
higher-frequency
bands,
which
restricts
modulation
speed
fabricated
devices.
In
this
paper,
an
electrode
co-loaded
with
square
serrations
T-shaped
stubs
was
utilized
achieve
precise
matching
excellent
impedance
matching.
Leveraging
approach,
a
TFLN
modulator
chip
electro-optic
bandwidth
far
exceeding
67
GHz
return
loss
greater
than
12
dB
successfully
silicon
substrate.
The
RF
can
be
tuned
altering
lengths
slow-wave
structures,
provides
guidance
design
optimization
broadband
modulators.
physica status solidi (RRL) - Rapid Research Letters,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 11, 2025
Slow
light
is
a
fascinating
research
area
that
of
fundamental
interest
and
has
enabled
diverse
applications.
Electromagnetically
induced
transparency
(EIT),
or
its
analogies,
flat
band
are
two
distinct
approaches
to
realize
the
slow
effect
in
photonic
systems.
Here,
these
methods
combined
propose
flatband‐enhanced
collective
EIT‐like
slow‐light
all‐dielectric
kagome
metasurfaces.
The
Q
‐factor,
group
index,
near‐field
electric‐field
enhancement
can
be
significantly
improved
for
window
enhanced
by
flatband,
compared
one
without
such
enhancement,
shown.
simulated
transmittance
spectra
showing
windows
experimentally
demonstrated.
Making
use
windows,
bulk
sensitivities
up
405
410
nm/RIU
numerically
obtained.
Remarkably,
reducing
nanodisk
size,
an
extremely
large
index
16
105
high
intensity
8220
obtained
silicon
metasurface.
This
work
expected
provide
new
direction
realizing
strong
metasurfaces
with
promising
applications
biochemical
sensing,
nanolasing,
nonlinear
optics.
Photonics,
Journal Year:
2025,
Volume and Issue:
12(5), P. 484 - 484
Published: May 14, 2025
Silicon
modulators
operating
at
high
speeds
are
crucial
for
contemporary
optical
communication
systems;
nevertheless,
their
performance
is
limited
by
the
resistance–capacitance
(RC)
time
constant.
This
research
introduces
a
modulator
based
on
silicon
strip
waveguide,
also
known
as
capacitively
coupled
(CC-Si),
arranged
in
series
push–pull
(SPP)
configuration,
which
effectively
addresses
constraints
imposed
RC
The
demonstrates
consistent
electro-optic
(EO)
response
that
extends
to
68
GHz.
Furthermore,
it
achieves
phase
shift
of
0.022
radians
C-band
wave
when
exposed
15
GHz
radio
frequency
(RF)
modulation
signal
with
an
amplitude
2.45
V.
Journal of Lightwave Technology,
Journal Year:
2024,
Volume and Issue:
42(10), P. 3554 - 3562
Published: Feb. 19, 2024
Achieving
high
data
rate
with
simple
system
configuration
and
low
power
consumption
is
of
great
interest
in
short-reach
intensity-modulation
direct-detection
(IM-DD)
fiber
links
for
future
datacenter
networks,
business
local
area
networks
so
forth.
For
external
modulation-based
IM-DD,
recently
remarkable
modulator
performance
has
been
achieved
terms
3dB
bandwidth,
exploiting
different
materials/platforms.
However,
due
to
the
relatively-high
RF-to-RF
(or
end-to-end)
signal
loss,
optical
amplifiers
(OA)
and/or
RF
(RFA)
were
typically
needed
IM-DD
links,
which
increases
complexity
dissipation.
In
this
work,
we
present
a
more
comprehensive
figure
merit
(FoM)
(and
link)
design,
namely
"slope
efficiency
(SLE)",
takes
into
account
not
only
bandwidth
but
also
half-wave
voltage
RF/optical
waveguide
losses,
can
provide
guiding
principle
design
toward
lower
loss.
With
high-SLE
modulator,
both
OA
RFA
be
omitted
even
when
supporting
broadband
signals
CMOS-level
driving
voltages.
We
theoretically
investigate
impact
modulators
technology
SLE
on
pulse
amplitude
modulation
(PAM)
link.
Next,
report
series
PAM
transmission
experiments
Lithium
Niobate
intensity
prototype,
enables
sub-1
Vpp
driving,
up-to-432Gb/s
over
up-to-600m
single-mode
C-band
OA&RFA-free
reception
digital
processing
(DSP)
complexity.
instance,
384Gb/s
PAM8
300m,
transmitter
was
DSP-free
while
symbol-spaced
decision-feedback
equalizer
(DFE)
61
feedforward
taps
1
feedback
tap
sufficient
receiver
considering
16.7%
hard-decision
(HD)-FEC.
Furthermore,
experimentally
show
that
supports
ultra-wide
bands
(O-,
S-,
C-
L-band).
Abstract
Optical
frequency
combs
(OFCs)
have
evolved
into
one
of
the
most
active
areas
photonics,
underpinning
advancements
in
both
fundamental
science
and
commercial
contexts.
Electro‐optic
modulation
for
OFC
generation
offers
excellent
versatility,
stability,
phase
coherence.
With
rapid
progress
micro‐nano
fabrication
techniques,
electro‐optic
(EOFCs)
been
realized
on
many
integrated
platforms,
including
silicon
insulator
(SOI),
indium
phosphide
(InP),
lithium
niobate
(LNOI).
These
compact,
low‐cost,
energy‐efficient
EOFCs
support
a
wide
range
applications.
In
this
study,
we
review
theory
EOFCs,
summarize
demonstrations
main
present
applications,
envision
development
directions
view
materials,
devices,
