10 Gbits/s Lithium Niobate Electro-Optic Modulator
Data Sheet
May 2001
The Lithium Niobate Modulators include three single-drive
modulators (2623N, 2623Y, 2623CS) and a single-drive modula-
tor with an integrated attenuator (2623CSA). All devices are
capable of modulation rates up to 10 Gbits/s.
Features
s
Ti-diffusion process
s
Single-drive technology
s
C- and L-band models
s
Slim, hermetic package
s
Bandwidths up to 10 GHz
s
Operational over a temperature range of 0 C to
70 C
s
43
design for minimal electrical reflections
s
Angled interfaces for minimal optical reflections
s
Integrated optical attenuator available on
10 Gbits/s modulator (2623CSA)
s
Tested to
Telcordia Technologies
* 468
Benefits
s
Excellent long-term bias stability
s
Internal polarizer
s
Low modulation voltages
Applications
s
Digital high-speed telecommunications:
-- SONET: OC-1 through OC-192
-- SDH: STM-16, STM-64
-- Undersea communications
s
Internet data communications
s
SONET/SDH test equipment
*
Telcordia Technologies
is a trademark of Telcordia Technologies,
Inc.
Data Sheet
10 Gbits/s Lithium Niobate Electro-Optic Modulator
May 2001
2
2
Agere Systems Inc.
Description
The 10 Gbits/s Electro-Optic Modulator is designed for
long-wavelength, single-mode external amplitude mod-
ulation applications. It uses an integrated Mach-
Zehnder configuration to convert single polarization
CW light from a semiconductor (DFB) laser into a time-
varying optical output signal. Agere Systems Inc. also
offers a 10 mW CW laser with polarization-maintaining
fiber (D2525P) to use as a source for the modulator.
The Ti-diffusion process is a standard feature on all
modulator devices. The 2623N, 2623Y, and 2623CS
are single-drive, 10 Gbits/s modulators; the 2623CSA
is a single-drive, 10 Gbits/s modulator with an attenuat-
ing section. Variable attenuation to >19 dB is achieved
through a dc bias voltage.
The package is hermetic to protect the LiNbO
3
die from
the environment. Novel processing techniques now
make it possible to achieve 20-year operation with little
drift in the dc bias point. The modulator is tested to, and
meets the intent of TR-NWT-00468.
Other standard features include PANDA-type polariza-
tion-maintaining fiber (PMF) for the optical input (all
codes) and output (2623N, 2623Y, and 2623C) fiber
with FC-type connectors that are keyed to the axis of
polarization. Custom designs are available.
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess
of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.
Parameter
Symbol
Min
Max
Unit
Storage Temperature
T
stg
40
85
C
Optical Input Power @ 1.5
m
P
IN
--
30
mW
RF Voltage (peak to peak)
V
RF
--
10
V
dc Voltage (RF input)
V
dcRF
20
20
V
dc Voltage (Attenuator input)
V
dcATT
25
25
V
Operating Temperature
T
OP
0
70
C
Data Sheet
May 2001
10 Gbits/s Lithium Niobate Electro-Optic Modulator
3
Agere Systems Inc.
Optical/Electrical Characteristics
* Bandwidth stated is electrical-optical-electrical as determined by the ratio of the received RF electrical power (at a photodiode) relative to the
RF electrical power used to drive the modulator. This response is referenced to the value at 130 MHz.
Note: Circuitry in dotted lines is used only with the 2623CSA.
Figure 1. Recommended Operating Circuit Diagram
Figure 2. Equivalent Circuit Diagram
Table 1. Optical/Electrical Characteristics
Parameter
Min
Typ
Max
Unit
Operating Wavelength:
C-band
L-band
1525
1565
--
--
1565
1620
nm
nm
Insertion Loss:
2623N, 2623Y, 2623CS
2623CSA
3
3.5
3.7
4.5
5.5
6.5
dB
dB
Extinction Ratio @ dc
20
27
--
dB
Extinction Ratio @ RF
--
13
--
dB
S11 Optical Return Loss
--
--
35
dB
Bandwidth*
8
10
--
GHz
Drive Voltage (V
) @ dc
2.8
3.1
4.0
V
Drive Voltage (V
) @ 1 GHz
3.5
4.1
5.0
V
Attenuation Voltage @ 19 dB
15
19
22
V
Electrode Impedance
--
43
--
S11 Electrical Return Loss (0.13 GHz--5 GHz)
--
15
13
dB
S11 Electrical Return Loss (5 GHz--10 GHz)
14
12
dB
S11 Electrical Return Loss (10 GHz--18 GHz)
--
8
6
dB
MODULATOR
DRIVER
BIAS
TEE
dc BIAS
CONTROLLER
PHOTODETECTOR/
PREAMP
dc
ATTENUATION
CONTROLLER
HIGH-
SPEED
DATA
INPUT
PMF
CW-LASER
2623N, 2623Y, 2623CS, 2623CSA
SPLITTER
SEE NOTE.
2623N, 2623Y, 2623CS
43
0.2
F
43
0.2
F
10 pF
2623CSA
1-1063 (F)
1-1062 (F)
Data Sheet
10 Gbits/s Lithium Niobate Electro-Optic Modulator
May 2001
4
Agere Systems Inc.
Optical/Electrical Characteristics
(continued)
Electrical Signal Input
Electrical signal input is made through SMA coaxial connectors. The standard device includes an internal termina-
tion network. Care must be taken not to exceed the recommended 8 in./lb. of torque when making connections to
these inputs. High-frequency coaxial cable is recommended.
Characteristic Curves
Figure 3. Magnitude of Electro-Optic Response,
0.130 GHz--20 GHz.
Figure 4. S11, 0.130 GHz--20 GHz
Figure 5. Output Power vs. Bias Voltage
.
Figure 6. Optical Power vs. Attenuator Bias Voltage
dBe
COR
AVG
START .130 000 000 GHz STOP 20.000 000 000 GHz
LOG MAG3 dB/ REF 55.48 dB 1: 55.846 dB
E/O
CH1
W/A
4
HID
FREQUENCY
SMA
POW
E
R (
3dB/
div)
1
2
4
3
1. 130 000 000 GHz
4. 61.766 dB
18.76 48 GHz
2. 55.476 dB
0.9248 GHz
3. 58.476 dB
9.9690 GHz
dBe
COR
START .130 000 000 GHz STOP 20.000 000 000 GHz
LOG MAG
5 dB/ REF 0 dB 1: 18.896 dB
S11
CH1
HID
FREQUENCY
P
O
W
E
R (3 dB/
div)
1
2
4
3
1. 924 000 000 GHz
4. 8.7734 dB
14.7344 GHz
2. 15.278 dB
3.7006 GHz
3. 16.27 dB
5.0975 GHz
0
10
20
30
40
50
20
10
0
10
20
MODULATOR dc BIAS VOLTAGE (V)
OPT
I
CA
L
PO
WER
OUT (
d
B
)
1-1060(F)
1-898 (C)
0
10
20
30
40
50
40
20
0
20
40
ATTENUATOR BIAS VOLTAGE (V)
OPTI
CA
L
P
O
W
E
R (dB)
60
30
10
10
30
START = 23.98 V
STOP = 25.58 V
1-1061(F)
1-1058(F)
1-1059(F)
Data Sheet
May 2001
10 Gbits/s Lithium Niobate Electro-Optic Modulator
5
Agere Systems Inc..
Outline Diagrams
Dimensions are in inches and (millimeters).
2623N, 2623Y, 2623CS Lithium Niobate Modulators
SMA SHORTING CAP
FIELD-REPLACEABLE
SMA CONNECTOR
BEND LIMITER
2 PLACES
FC/PC CONNECTOR OPTIONAL
2 PLACES
Agere
Electro-Optic Modulator
Model
S/N
A06686 98
2623N
XXXX
0.20 (5.1)
1.20
(30.5)
0.14 (3.6)
1.5 METER
MAXIMUM
LOOSE-TUBE
JACKETED FIBER
2 PLACES
2623N S/N XXXX A0668698
014097001
0.32 (8.1)
0.43
#4-40 UNC 2B
0.12 (3.05) DEEP MIN,
6 PLACES
4.64 (117.9)
0.60 (15.2)
0.39
(9.8)
0.20
(5.11)
1.53
(38.9)
4.00 (101.6)
2.00 (50.8)
0.09 (2.2)
(10.8)
INPUT
1-1064(F)a
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