Advance Data Sheet
March 2001
T92-Type 10 Gbits/s 1300 nm
Uncooled DFB Laser Transmitter
s
s
s
s
Laser degrade alarm
Clock-select input (next generation)
Transmitter disable input
SC, FC-PC, and LC optical connector options
Applications
s
Telecommunications:
— SONET/SDH
— Subscriber loop
— Metropolitan area networks
High-speed data communications
s
Offering SONET/SDH compatibility, the T92-Type Uncooled
Laser Transmitter is manufactured in a 24-pin DIP assembly
with a single-mode fiber pigtail.
Description
The T92-Type 10 Gbits/s laser transmitters are
designed for use in transmission systems and high-
speed data communication applications. The trans-
mitter operates at the SONET OC-192 rate, as well
as, the ITU-T SDH rate of STM-64.
The transmitters meet all present
Telcordia Technolo-
gies
* GR-253-CORE requirements and the ITU-T
G.691 recommendations (see footnote 7, p.4). The
transmitters are also ideally suited for extended dis-
tance data and networking applications.
Manufactured in a 24-pin DIP assembly, the transmit-
ter uses an hermetic MQW isolated 1300 nm DFB
laser, an InGaAs PIN photodiode back-facet monitor
and a GaAs laser driver IC. The transmitter requires
a single power supply (–5.2 V or +5.0 V). Clocked
operation can be enabled for those applications
where jitter is critical.
Pin information is listed in Table 1.
Features
s
s
s
Multisource compliant
Data rates to 10 Gbits/s
SONET and ITU-T compliant at OC-192 and
STM-64 (see footnote 7 on page 4)
Uncooled, field-proven InGaAsP MQW laser
1300 nm DFB
Clocked or nonclocked operation with single-ended
or differential inputs
50
Ω
ac-coupled 500 mVp-p—1000 mVp-p single-
ended data and clock inputs
Operation from single –5.2 V or +5.0 V power sup-
ply
Low profile, 24-pin PWB assembly
Automatic optical power control
Wide operating case temperature range: 0 °C to
70 °C
Laser bias monitor output
Normalized laser back-facet monitor output
s
s
s
s
s
s
s
s
s
s
*
Telcordia Technologies
is a trademark of Telcordia Technologies,
Inc.
T92-Type 10 Gbits/s 1300 nm
Uncooled DFB Laser Transmitter
Advance Data Sheet
March 2001
Bias Monitor Output
This is an optional analog output voltage that indicates
the bias current being supplied to the laser. It is refer-
enced to V
EE
. The conversion for this monitor output is
20 mV for every 1 mA of bias current to the laser. For
example, a 400 mV output above V
EE
would indicate
20 mA of bias current to the laser.
Table 1. Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Name
V
EE
Back-facet Monitor
1
Bias Monitor
Tx Enable
Clock Select
Ground
Temperature Monitor
2
Laser Degrade Alarm
NUC
NUC
NUC
3
V
EE
V
CC
NUC
3
Ground
DATA
4
Ground
DATA
4
Ground
CLOCK
4
Ground
CLOCK
4
Ground
V
CC
Description
(continued)
Transmitter Processing
The transmitter can withstand normal wave soldering
processes. The complete transmitter module is not her-
metically sealed; therefore, it should not be immersed
in or sprayed with any cleaning solution or solvents.
The process cap and fiber pigtail jacket can deform at
temperatures greater than 85 °C. The transmitter pins
can be wave-soldered at a maximum temperature of
250 °C for 10 seconds.
Installation Considerations
Although the transmitter has been designed with rug-
gedness in mind, care should be used during handling.
The optical connector should be kept free from dust,
and the process cap should be kept in place as a dust
cover when the device is not connected to a cable. If
contamination is present on the optical connector, the
use of canned air with an extension tube should
remove any debris. Other cleaning procedures are
identified in the
Cleaning Fiber-Optic Assemblies
Tech-
nical Note (TN95-010LWP).
Laser Degrade-mode Alarm
An output of the transmitter that indicates when the
laser bias has reached its end-of-life condition. The
transmitter will still function, but may not meet all speci-
fications. The transmitter should be replaced when this
alarm is active (active low). Specifically, this alarm indi-
cates that the bias of the laser has changed more than
50% from its original value.
Back-facet Monitor Output
This is an analog output that indicates whether the
transmitter has the correct optically generated back-
facet current. It may be used for alarm purposes. It is
referenced to V
EE
. Under normal operating conditions,
this monitor will output a voltage that is nominally
500 mV above V
EE
. When the optical output power of
the transmitter increases or decreases, this voltage will
move proportionately.
1. Laser back-facet function is a customer-use option that is not
required for normal operations of the transmitter and is normally
used during manufacture and for diagnostics.
2. Laser temperature (°C) = (V
TEMP
– 0.5 V)/0.01 V, where V
TEMP
is
the temperature monitor voltage.
3. This pin can be tied to ground.
4. For single-ended operation, data signal must be on pin 16, and
DATA
(pin 18) must 50
Ω
terminated to ground; for single-ended
clocked operation, clock signal must be on pin 20, and
CLOCK
(pin
22) must be 50
Ω
terminated to ground.
2
Agere Systems Inc.
Advance Data Sheet
March 2001
T92-Type 10 Gbits/s 1300 nm
Uncooled DFB Laser Transmitter
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 operations sections of the data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.
Parameter
Supply Voltage
Operating Case Temperature Range
Storage Case Temperature Range
Lead Soldering Temperature/Time
Relative Humidity (noncondensing)
Minimum Fiber-Bend Radius
Symbol
V
CC
T
C
T
stg
—
RH
—
Min
—
0
–40
—
—
1.00 (25.4)
Max
5.5
70
85
250/10
85
—
Unit
V
°C
°C
°C/s
%
in. (mm)
Characteristics
(Minimum and maximum values specified over operating case temperature range at 50% duty cycle data signal.
Typical values are measured at room temperature unless otherwise noted.)
Table 2. Electrical Characteristics
Parameter
dc Power Supply Voltage
1
dc Power Supply Current Drain
Input Data/Clock Voltage:
2, 3
Single-ended Input
Clocked/Nonclocked Select Voltage:
4
Clocked Operation
Nonclocked Operation
Clock/Data Input Impedance
Clock/Data RF Return Loss (50 kHz to 10 Ghz)
Clock/Data Input Skew
5
Transmitter Disable Voltage
6
Transmitter Enable Voltage
Degrade Mode Alarm Voltage–Normal
Degrade Mode Alarm Voltage–Alarmed
7
Laser Bias Voltage
8
Back-facet Monitor Voltage (50% duty cycle)
9
Symbol
V
EE
I
V
IN
V
SEL_CLK
V
SEL CLK
R
IN
S11
dc
SKEW
V
DIS
V
EN
V
NORMAL
V
ALARMED
V
B
V
BF
Min
–5.5/+4.75
—
500
V
EE
V
CC
– 2.0
—
—
–25
V
CC
– 2.0
V
EE
V
CC
– 2.0
V
EE
0
460
Typ
–5.2/+5.0
250
700
—
—
50
—
0
—
—
—
—
500
500
Max
–4.9/+5.25
400
1000
V
EE
+ 0.8
V
CC
—
–10
25
V
CC
V
EE
+ 0.8
V
CC
V
EE
+ 0.8
2400
540
Unit
V
mA
mVp-p
V
V
Ω
dB
ps
V
V
V
V
mV
mV
1. With V
EE
connected to –5.2 V, V
CC
must be at 0 V; With V
CC
connected to +5.0V, V
EE
must be at 0 V.
2. Inputs are ac-coupled into an equivalent input impedance of 50
Ω.
3. Single-ended or differential operation may be used. If the inputs are driven single-ended, the unused inputs (
Clock
and
Data
) must be 50
Ω
ter-
minated to ground.
4. Clocked operation is normally enabled and only requires an external voltage to disable. For nonclocked operation, pin 5 must be tied to V
CC
.
5. With clocked operation, the optical output changes state with the rising edge of the input clock signal. The skew is measured with the rising
edge of the clock centered in the middle of the data eye.
6. The transmitter is normally enabled and only requires an external voltage to disable.
7. This alarm will go active when the bias current to the laser has increased 50% or more from its beginning-of-life (BOL) value.
8. This voltage is measured from Pin 3 to V
EE
and is converted to laser bias current with the ratio of 20 mV/mA.
9. This voltage is measured from Pin 2 to V
EE
.
Agere Systems Inc.
3
T92-Type 10 Gbits/s 1300 nm
Uncooled DFB Laser Transmitter
Advance Data Sheet
March 2001
Characteristics
(continued)
Table 3. Optical Characteristics
Parameter
Average Power Output, T923xFAA
1
Center Wavelength Range, T923xFAA
Spectral Width
2
Wavelength Shift with Temperature
Side-mode Suppression Ratio
3
Dispersion Penalty (D = 12 km, max.)
Extinction Ratio
4
Eye Mask of Optical Output
5, 6, 7
Symbol
P
O
λ
C
∆λ
20
∆λ/∆
T
SMSR
D
P
r
e
—
Min
–6
1290
—
—
30
—
6
Typ
–2
—
—
0.1
—
—
7
See Note 7.
Max
–1
1330
1
—
—
1
—
Unit
dBm
nm
nm
nm/°C
dB
dB
dB
—
1. Output power definitions and measurements per proposals to the ITU-T Recommendation G.691.
2. Full spectral width measured 20 dB down from the maximum of the central wavelength peak under fully modulated conditions.
3. Ratio of the peak output power in the dominant longitudinal mode to the power in the most significant side mode under fully modulated condi-
tions.
4. Ratio of logic 1 output power to logic 0 output under fully modulated conditions.
5. GR-253-CORE,
Synchronous Optical Network (SONET) Transport Systems: Common Generic Criteria.
.
6. ITU-T Recommendation G.691,
Optical Interfaces for Equipment and Systems Relating to the Synchronous Digital Hierarchy
7. The 10 Gbits/s mask has not been currently agreed to by the standards committee. Proposal is to use the 2.5 Gbits/s SONET eye mask test
scaled to 10 Gbits/s. The inner mask will be met, however, the outer mask will not be met.
4
Agere Systems Inc.
Advance Data Sheet
March 2001
T92-Type 10 Gbits/s 1300 nm
Uncooled DFB Laser Transmitter
Outline Drawings
Dimensions are in inches and (millimeters).
2.015
(51.18)
1.055
(26.80)
1.450
(36.83)
0.260
(6.60)
0.392
(9.96)
0.125
(3.18)
0.100
(2.54)
0.018
(0.46)
0.015
(0.38)
1.100
(27.94)
0.720
(18.29)
1.000
(25.40)
1-1256(F)
1-1256(F)
1-1256(F)
Agere Systems Inc.
5
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