Photonics,
Journal Year:
2024,
Volume and Issue:
12(1), P. 26 - 26
Published: Dec. 31, 2024
In
today’s
era
where
the
demand
for
computational
resources
by
large
models
is
increasingly
high,
optical
computing
offers
an
alternative
physical
platform
computation.
With
its
high
parallelism
and
maturation
of
integrated
photonic
technologies,
expected
to
further
support
required
models.
For
one-dimensional
convolution
accelerators,
existing
methods
can
fully
utilize
working
bandwidth
electro-optic
modulators
frequency
light
sources.
However,
most
computations
currently
require
execution
two-dimensional
matrix
convolutions,
encoding
schemes
suffer
a
drop
in
terms
effective
per
second
when
performing
convolutions.
response
this,
we
propose
new
scheme
that
accelerators.
operations
with
kernel
size
M×M,
compared
schemes,
it
achieve
M-fold
increase
computation
rate.
This
implies
under
constraints
essentially
same
hardware
performance,
adopting
our
newly
proposed
significant
improvement
performance.
We
construct
acceleration
system
demonstrate
principles
encoding.
Advances in Physics X,
Journal Year:
2024,
Volume and Issue:
9(1)
Published: March 12, 2024
The
lithium
niobate
on
insulator
devices
confine
the
light
field
to
submicron
size
in
monocrystalline
niobate,
achieve
ultra-strong
electro-optical
interaction
and
nonlinear
optical
interaction,
thus
extend
frontiers
of
photonic
research
past
decade.
Such
are
manufactured
using
nano-fabrication
technology
over
thin-film
wafer,
which
usually
stands
a
silica
layer
above
substrate
material,
including
low-loss
waveguides,
modulators,
domain
engineered
structures,
high-Q
microring
resonators
electrical
filters
etc.,
lead
breakthroughs
communication,
microwave
photonics
quantum
integration.
Optics Letters,
Journal Year:
2024,
Volume and Issue:
49(12), P. 3504 - 3504
Published: May 28, 2024
Stable
pulse
and
flat-top
frequency
comb
generation
are
an
indispensable
component
of
many
photonic
applications,
from
ranging
to
communications.
Lithium
niobate
on
insulator
is
excellent
electro-optic
(EO)
platform,
exhibiting
high
modulation
efficiency
low
optical
loss,
making
it
a
fitting
candidate
for
through
continuous-wave
(CW)
light,
commonly
utilized
method
generating
ultrashort
pulses.
Here,
we
demonstrate
on-chip
module
thin-film
lithium
(TFLN)
consisting
Mach–Zehnder
interferometer
(MZI)
amplitude
modulator
(AM)
cascaded
phase
(PM)
system
driven
by
single-electrode
drive.
We
show
that
when
operated
in
the
correct
regime,
chips
can
generate
combs
with
spectral
power
flatness.
In
addition,
optically
package
one
generator
via
wire
bonding.
The
pulses
generated
photonic-wire-bonded
device
compressed
840
fs
duration
using
fiber
extremely
stable
operation.
Abstract
In
recent
years,
there
is
a
growing
interest
in
lithium‐niobate‐on‐insulator
(LNOI)
photonics
due
to
its
superior
material
properties,
particularly
large
electro‐optical
(EO)
coefficient.
As
promising
method
improve
the
communication
capacity,
mode‐division
multiplexing
(MDM)
has
received
intensive
attention.
However,
achieving
effective
mode
manipulation
challenging
hybridness
nature
of
LNOI
photonic
waveguides.
this
work,
an
innovative
multi‐channel
mode‐division‐multiplexing
transmitter
proposed
that
integrates
eight
EO
modulators
with
eight‐channel
multiplexer
for
first
time.
To
leverage
effect
and
enable
on‐chip
manipulation,
are
strategically
designed
along
y
‐propagation
direction
access
largest
Conversely,
z
mitigate
hybridness.
Experimental
results
demonstrate
present
MDM
exhibits
low
loss
(<2.5
dB)
crosstalk
(−12–−17
across
C‐band.
The
modulator
features
voltage‐length
product
2.7
V·cm
RF
modulation
damping
2.0
dB
even
at
67
GHz.
With
implementation
transmitter,
successful
high‐capacity
data
transmissions
8
×
60
Gbps
On‐Off‐Keying
signals
50
four‐level
pulse
amplitude
have
been
achieved
single
wavelength‐carrier.
APL Photonics,
Journal Year:
2025,
Volume and Issue:
10(1)
Published: Jan. 1, 2025
On-chip
polarization
splitter–rotators
(PSRs)
are
crucial
components
for
coherent
optical
communication
and
polarization-division
multiplexing
systems.
Here,
we
propose
experimentally
demonstrate
a
splitter–rotator
based
on
the
principles
of
adiabatic
mode
evolution
stimulated
Raman
passage
thin-film
lithium
niobate
(TFLN)
platform.
The
experimental
results
indicate
that
fabricated
device
exhibits
an
insertion
loss
less
than
0.5
dB
extinction
ratios
exceeding
20
over
130-nm
band,
with
potential
to
extend
up
250
nm
as
predicted
by
simulations.
Large
fabrication
tolerance
is
also
demonstrated
more
in
wavelength
range
1500–1630
nm.
PSR
could
become
indispensable
component
future
TFLN
photonic
integrated
circuits.
Abstract
Optical
coherence
with
high
precision
and
sensitivity
holds
achievements
in
communication,
metrology,
sensing.
The
optical
vernier
effect
generated
by
the
dual‐comb
interference
highlights
technology
to
heighten
accuracy
sensitivity,
particularly
visible
infrared
bands.
However,
maturity
frequency
domain
of
may
overshadow
its
attributes
time
domain,
which
are
limited
enhancing
comprehensive
performance.
This
work
provides
a
lag
compensation
that
enables
hyperfine
spectrum
ultra‐resolution,
verified
cascading
terahertz
interferometer.
strategy
proves
71.4
times
improvement
resolution
beyond
intrinsic
resolution,
reaching
Nyquist
sampling
limit
without
necessitating
unique
materials
or
compromising
device
geometry.
Furthermore,
universal
Lag‐Interference‐Sensitivity
correlation
is
established
guide
an
ultra‐sensitivity
1.4
×
10
4
GHz·RIU
−1
within
0.2–1
THz
range,
defying
two
orders
magnitude
compared
existing
reports.
Finally,
application
biochemical
sensing,
2.63
GHz·mm
2
·ng
0.59
ng·mm
−2
,
outperforming
current
reports
stimulating
further
exploration
ultra‐sensitive
on‐chip
sensors,
demonstrated.
validation
appealing
scheme
for
metrology
high‐resolution
Optics Express,
Journal Year:
2025,
Volume and Issue:
33(7), P. 16338 - 16338
Published: March 19, 2025
Thin-film
lithium
niobate
(TFLN)
has
gained
significant
attention
as
a
platform
for
photonic
integrated
circuits
(PICs)
due
to
its
exceptional
properties,
including
high
nonlinear
coefficients
and
strong
electro-optic
response.
However,
efficient
coupling
between
TFLN
chips
optical
fibers
remains
challenge,
with
current
edge
coupler
designs
often
facing
issues
related
fabrication
complexity
alignment
precision.
In
this
paper,
we
propose
high-efficiency,
fabrication-friendly,
alignment-tolerant
bident
based
on
overcome
these
limitations.
The
design
comprises
three
distinct
regions:
the
facet
region,
beam
combining
adiabatic
taper
region.
It
achieves
measured
efficiency
of
better
than
-1.52
dB
per
at
1550
nm,
an
average
ranging
from
-1.85
-1.6
across
C-band,
mode
field
diameter
approximately
4
μm.
Notably,
offers
large
tolerance
±1
This
simplifies
process,
requiring
only
single
overlay
step.
proposed
practical
solution
interface
packaging
in
devices,
enabling
performance
low
process
complexity.
