Data Sheet
May 2001
10 Gbits/s Lithium Niobate Electro-Optic Modulator
Features
s
s
s
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Ti-diffusion process
Single-drive technology
C- and L-band models
Slim, hermetic package
Bandwidths up to 10 GHz
Operational over a temperature range of 0 °C to
70 °C
43
Ω
design for minimal electrical reflections
Angled interfaces for minimal optical reflections
Integrated optical attenuator available on
10 Gbits/s modulator (2623CSA)
Tested to
Telcordia Technologies
* 468
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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.
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Benefits
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Excellent long-term bias stability
Internal polarizer
Low modulation voltages
Applications
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Digital high-speed telecommunications:
— SONET: OC-1 through OC-192
— SDH: STM-16, STM-64
— Undersea communications
Internet data communications
SONET/SDH test equipment
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*
Telcordia Technologies
is a trademark of Telcordia Technologies,
Inc.
10 Gbits/s Lithium Niobate Electro-Optic Modulator
Data Sheet
May 2001
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
Storage Temperature
Optical Input Power @ 1.5
µm
RF Voltage (peak to peak)
dc Voltage (RF input)
dc Voltage (Attenuator input)
Operating Temperature
Symbol
T
stg
P
IN
V
RF
V
dcRF
V
dcATT
T
OP
Min
–40
—
—
Max
85
30
10
20
25
70
Unit
°C
mW
V
V
V
°C
–20
–25
0
2
Agere Systems Inc.
Data Sheet
May 2001
10 Gbits/s Lithium Niobate Electro-Optic Modulator
Optical/Electrical Characteristics
Table 1. Optical/Electrical Characteristics
Parameter
Operating Wavelength:
C-band
L-band
Insertion Loss:
2623N, 2623Y, 2623CS
2623CSA
Extinction Ratio @ dc
Extinction Ratio @ RF
S11 Optical Return Loss
Bandwidth*
Drive Voltage (Vπ) @ dc
Drive Voltage (Vπ) @ 1 GHz
Attenuation Voltage @ –19 dB
Electrode Impedance
S11 Electrical Return Loss (0.13 GHz—5 GHz)
S11 Electrical Return Loss (5 GHz—10 GHz)
S11 Electrical Return Loss (10 GHz—18 GHz)
Min
1525
1565
3
3.5
20
—
—
8
2.8
3.5
15
—
—
–
—
Typ
—
—
3.7
4.5
27
13
—
10
3.1
4.1
19
43
–15
–14
–8
Max
1565
1620
5.5
6.5
—
—
–35
—
4.0
5.0
22
—
–13
–12
–6
Unit
nm
nm
dB
dB
dB
dB
dB
GHz
V
V
V
Ω
dB
dB
dB
* 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.
dc BIAS
CONTROLLER
SEE NOTE.
PHOTODETECTOR/
PREAMP
HIGH-
SPEED
DATA
INPUT
MODULATOR
DRIVER
BIAS
TEE
dc
ATTENUATION
CONTROLLER
PMF
CW-LASER
2623N, 2623Y, 2623CS, 2623CSA
SPLITTER
Note: Circuitry in dotted lines is used only with the 2623CSA.
1-1062 (F)
Figure 1. Recommended Operating Circuit Diagram
43
Ω
0.2
µF
2623N, 2623Y, 2623CS
43
Ω
0.2
µF
–10 pF
2623CSA
Figure 2. Equivalent Circuit Diagram
Agere Systems Inc.
1-1063 (F)
3
10 Gbits/s Lithium Niobate Electro-Optic Modulator
Data Sheet
May 2001
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
CH1 E/O
W/A
dBe
COR
1
AVG
4
SMA 2
HID
3
4
LOG MAG dB/ REF –55.48 dB 1: –55.846 dB
3
1. 130 000 000 GHz
2. –55.476 dB
0.9248 GHz
3. –58.476 dB
9.9690 GHz
4. –61.766 dB
18.76 48 GHz
0
OPTICAL POWER OUT (dB)
–10
POWER (3dB/div)
–20
–30
–40
–50
START .130 000 000 GHz STOP 20.000 000 000 GHz
FREQUENCY
1-1058(F)
–20
–10
0
10
20
1-1060(F)
MODULATOR dc BIAS VOLTAGE (V)
Figure 3. Magnitude of Electro-Optic Response,
0.130 GHz—20 GHz.
.
CH1 S11
LOG MAG
5 dB/ REF 0 dB 1: –18.896 dB
1. 924 000 000 GHz
2. –15.278 dB
3.7006 GHz
3. –16.27 dB
5.0975 GHz
4. –8.7734 dB
14.7344 GHz
Figure 5. Output Power vs. Bias Voltage
0
–10
OPTICAL POWER (dB)
dBe
COR
POWER (3 dB/div)
–20
HID
4
1
2
3
–30
–40
–50
–60
START .130 000 000 GHz STOP 20.000 000 000 GHz
FREQUENCY
1-1059(F)
–40 –30
–20
–10
0
10
20
30
40
1-898 (C)
ATTENUATOR BIAS VOLTAGE (V)
START = –23.98 V
STOP = 25.58 V
1-1061(F)
Figure 4. S11, 0.130 GHz—20 GHz
Figure 6. Optical Power vs. Attenuator Bias Voltage
4
Agere Systems Inc.
Data Sheet
May 2001
10 Gbits/s Lithium Niobate Electro-Optic Modulator
Outline Diagrams
Dimensions are in inches and (millimeters).
2623N, 2623Y, 2623CS Lithium Niobate Modulators
SMA SHORTING CAP
FIELD-REPLACEABLE
SMA CONNECTOR
INPUT
A06686 98
1.20
(30.5)
0.20 (5.1)
Agere
Electro-Optic Modulator
Model
S/N
2623N
XXXX
0.14 (3.6)
BEND LIMITER
2 PLACES
FC/PC CONNECTOR OPTIONAL
2 PLACES
4.64 (117.9)
1.5 METER
MAXIMUM
LOOSE-TUBE
JACKETED FIBER
2 PLACES
014097001
0.60 (15.2)
2623N S/N XXXX A0668698
0.39
(9.8)
0.20
(5.11)
0.32 (8.1)
4.00 (101.6)
2.00 (50.8)
#4-40 UNC 2B
0.12 (3.05) DEEP MIN,
6 PLACES
0.09 (2.2)
0.43
(10.8)
1.53
(38.9)
1-1064(F)a
Agere Systems Inc..
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