1241/1243/1245-Type Uncooled Laser Transmitters
Data Sheet
February 2003
TriQuint Optoelectronics
Offering multiple output power options and SONET/SDH com-
patibility, the 1241/1243-Type Uncooled Laser Transmitter is
manufactured in a 20-pin, plastic DIP with a single-mode fiber
pigtail.
Features
Backward compatible with 1227/1229/1238-Type
Laser Transmitters
Space-saving, self-contained, 20-pin DIP
Uses field-proven, reliable InGaAsP MQW laser
Requires single 5 V power supply
SONET/SDH compatible
Uncooled laser with automatic optical power control
for constant output power over case temperature
range
No thermoelectric cooler required; reduces size and
power consumption
Uses low-power dissipation CMOS technology
Qualified to meet the intent of Telcordia
Technologies
TM reliability practices
Operates over data rates to 1062.5 Mb/s (NRZ)
Operation at 1.3 µm or 1.55 µm wavelength
Typical average output power options of 11 dBm,
8 dBm, 5 dBm, 2 dBm, and 0 dBm
ECL compatible, differential inputs
Operating temperature range of 40 °C to +85 °C
Transmitter-disable option
Applications
Telecommunications
-- Inter- and intraoffice SONET/ITU-T SDH
-- Subscriber loop
-- Metropolitan area networks
High-speed data communications
-- Fibre channel (FC-0)
124
1-Ty
pe
Unc
oole
d La
ser T
rans
mitt
er
®
riQ
T
uint
SEM
ICO
NDU
CTO
R
1241-Type
Uncooled Laser Transmitter
124
1-Ty
pe
Unc
oole
d La
ser
Tran
smit
ter
Data Sheet
February 2003
1241/1243/1245-Type Uncooled Laser Transmitters
2
2
For additional information and latest specifications, see our website: www.triquint.com
Description
The 1241/1243/1245-type Laser Transmitters are
designed for use in transmission systems and high-
speed data communication applications. Used in
intraoffice and intermediate-reach applications, the
transmitters are configured to operate at SONET rates
up to OC-12, as well as at ITU-T synchronous digital
hierarchy (SDH) rates up to STM-4. Specific versions
are also capable of operating up to 1062.5 Mb/s.
The transmitter meets all present Telcordia Technolo-
gies
GR-253-CORE requirements, ANSI T1.117-1991
SONET single-mode, and the ITU-T G.957 and G.958
recommendations. (See Table 5 to select transmitters
for the various SONET/SDH segments.)
The transmitter requires a single power supply (+5 V or
5 V) and operates over data rates of 1 Mb/s to
622 Mb/s (NRZ). Automatic power control circuitry pro-
vides constant optical output power over the operating
case temperature range. The automatic power control
circuitry also compensates for laser aging. The optical
wavelength tolerance at 25 °C is 1310 nm. The temper-
ature coefficient of wavelength for 1.3 µm Fabry-Perot
transmitters (1241-Type) is approximately 0.4 nm/°C.
The temperature coefficient of wavelength for 1.3 µm
and 1.55 µm distributed-feedback (DFB) transmitters
(1243/1245-Type) is approximately 0.1 nm/°C.
Transmitters are available for operation over several
different temperature ranges from 40 °C to +85 °C.
Manufactured in a 20-pin DIP, the transmitter consists
of a hermetic, InGaAs laser and a single CMOS driver
IC. The low-power consumption circuit provides modu-
lation, automatic optical output power control, and data
reference. The module can be driven by either ac- or
dc-coupled data in single-ended or differential configu-
ration. (See Recommended User Interfaces section for
typical connection schemes.) The laser bias and back-
facet monitor currents are electrically accessible for
transmitter performance monitoring. The transmitter
optical output may be disabled by a logic-level input.
Functional Overview
Transmitter Circuit Description and
Operation
Figure 1 shows a simplified schematic of the transmit-
ter; pin information is listed in Table 1. The laser within
the transmitter is driven by a single CMOS integrated
circuit, which provides the input data signal reference
level with automatic, temperature-compensated laser
bias, and modulation-current control. A back-facet pho-
todetector diode within the laser module provides an
indication of the laser's average optical output power.
The back-facet diode current is accessible as a voltage
proportional to photocurrent through pins 17 and 19 on
the transmitter. The back-facet diode also forms part of
the feedback control circuit, which helps maintain con-
stant output power.
The laser bias current is accessible as a dc-voltage by
measuring the voltage developed across pins 2 and 4
of the transmitter. Dividing this voltage by 10
will
yield the value of the laser bias current. This value will
change up or down in response to operating tempera-
ture, power supply voltage, data pattern, and laser
aging characteristics.
Table 1. Pin Descriptions
* Pins designated as no user connection should not be tied to
ground or any other circuit potential.
Laser back-facet and bias monitor functions are customer-use
options that are not required for normal operations of the trans-
mitter. They are normally used during manufacture and for
diagnostics.
Pin Number
Name
1
No user connection
*
2
Laser bias monitor (+)
3
No user connection
*
4
Laser bias monitor ()
5
V
EE
6
V
CC
7
Transmitter disable
8
V
CC
9
V
CC
10
No user connection
11
Case ground (RF ground)
12
V
CC
13
Case ground (RF ground)
14
V
EE
15
DATA
16
DATA
17
Laser back-facet monitor ()
*
18
V
CC
19
Laser back-facet monitor (+)
*
20
No user connection
For additional information and latest specifications, see our website: www.triquint.com
3
Data Sheet
1241/1243/1245-Type Uncooled Laser Transmitters
February 2003
Functional Overview
(continued)
1-868(C).h
Figure 1. Simplified Transmitter Schematic Input Data
Input Data
Data enters the transmitter through a comparator.
These inputs have internal pull-down resistors to a volt-
age reference that is 1.3 V below V
CC
. This configura-
tion allows the transmitter to be driven from either a
single-ended or a differential input signal. Since the
input is a comparator instead of a gate, the absolute
input signal levels are not important when the inputs
are driven differentially. When driven single-ended,
however, the input signal voltage should be centered
around V
CC
1.3 V to eliminate pulse-width distortion.
With a single-ended input, either input can be used and
the unused input can be left as an open circuit due to
the internal reference shown in Figure 1. The optical
output signal will be in the same sense as the input
data--an input logic high turns the laser diode on and
an input logic low turns the laser diode off. However, if
the negative input is used with a single-ended data
input signal, the optical signal will be the complement
of the data input signal.
The differential inputs of the 1241 Gbit versions are ter-
minated internally with 100
between the DATA and
DATA inputs.
Minimum Data Rate
Because the modulation and bias control circuitry are
influenced by the input data pattern, the standard trans-
mitter cannot be used in burst-mode type applications.
For burst-mode applications, please contact your
TriQuint Account Manager. The minimum data rate
(pseudorandom data, 50% average duty cycle) for the
1241/1243/1245-Type Transmitters is approximately
1 Mb/s.
Data Sheet
February 2003
1241/1243/1245-Type Uncooled Laser Transmitters
4
4
For additional information and latest specifications, see our website: www.triquint.com
Functional Overview
(continued)
Since most applications operate at very high data
rates, high-frequency design techniques need to be
used to ensure optimum performance from the trans-
mitter and interfacing circuitry. Input signal paths
should be kept as short and as straight as possible; dif-
ferential signal lines should be equal in length, and
controlled-impedance stripline or microstrip construc-
tion should always be used when laying out the
printed-wiring board traces for the data lines. The Rec-
ommended User Interfaces section of this data sheet
shows several methods of interfacing to the transmitter.
Power Supplies
The transmitter is configured for operation from either a
single +5 V power supply or a single 5 V power sup-
ply. For positive power supply operation, connect Vcc
to the +5 V power supply and connect V
EE
to ground or
circuit common. For operation from a 5 V power sup-
ply, connect V
CC
to ground and connect V
EE
to the 5 V
power supply. Whichever option is chosen, the V
CC
or
V
EE
connection to the transmitter should be well filtered
to prevent power supply noise from interfering with
transmitter operation.
Transmitter Specifications
Optical Output Power
During manufacture, the optical output power of every
transmitter is tuned to the typical value specified in the
data sheet for that particular transmitter code. The tun-
ing is performed at room ambient and a power supply
voltage of 5 V. The minimum and maximum values
listed in the data sheet for each code group reflect the
worst-case limits that the transmitter is expected to
operate within over its lifetime and over the allowed
power supply and the operating temperature range.
Every transmitter shipped receives a final test, which
includes a SONET eye-mask test at either the OC-3
(STM-1) data rate of 155.52 Mb/s, the OC-12 (STM4)
data rate of 622.08 Mb/s, or the fibre channel FC-0
data rate of 1062.5 Mb/s. The eye-mask test is meant
to examine the performance of the transmitter's output
optical waveform relative to a minimum data pattern
eye opening.
Connector Options
The standard optical fiber pigtail is 8 µm core single-
mode fiber having a 0.036 in. (914 µm) diameter tight-
buffered outer-jacket. The standard length is 39 in. ±
4 in. (1 m ± 10 cm) and can be terminated with either
an SC or FC-PC optical connector. Other connector
options may be available on special order. Contact
your TriQuint Account Manager for ordering informa-
tion.
Handling Precautions
CAUTION: This device is susceptible to damage as
a result of electrostatic discharge (ESD).
Take proper precautions during both
handling and testing. Follow guidelines
such as JEDEC Publication No. 108-A
(Dec. 1988).
Although protection circuitry is designed into the
device, take proper precautions to avoid exposure to
ESD. TriQuint employs a human-body model (HBM) for
ESD-susceptibility testing and protection-design evalu-
ation. ESD voltage thresholds are dependent on the
critical parameters used to define the model. A stan-
dard HBM (resistance = 1.5 k
, capacitance = 100 pF)
is widely used and, therefore, can be used for compari-
son purposes. The HBM ESD withstand voltage estab-
lished for the 1241-/1243-Type Transmitter is ±1000 V.
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 deformation
temperature is 85 °C. Transmitter pins can be wave-
soldered at maximum temperature of 250 °C for
10 seconds.
Installation Considerations
Although the transmitter features a robust design, 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, canned air with an
extension tube can be used to remove any debris.
Other cleaning procedures are identified in the techni-
cal note, Cleaning Fiber-Optic Assemblies (TN95-
010LWP).
For additional information and latest specifications, see our website: www.triquint.com
5
Data Sheet
1241/1243/1245-Type Uncooled Laser Transmitters
February 2003
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.
* With V
EE
connected to 5 V, V
CC
must be at 0 V; with V
CC
connected to +5 V, V
EE
must be at 0 V.
Specification depends upon the code ordered. The device is capable of a cold start at 40 °C; specifications are met
after a warm-up time determined by the system thermal design.
Characteristics
Minimum and maximum values specified over operating case temperature range at 50% duty cycle data signal and
end of life (EOL). Typical values are measured at beginning-of-life (BOL) room temperature unless otherwise
noted.
Table 2. Electrical Characteristics
1. With V
EE
connected to 5 V, V
CC
must be at 0 V; with V
CC
connected to +5 V, V
EE
must be at 0 V.
2. Input measured from V
CC
with 50
load to (V
CC
2 V). 10K, 10K H, and 100K ECL compatible.
3. Between 10% and 90% (50% duty cycle) where t is the bit period in ns.
4. The transmitter is normally enabled and only requires an external voltage to disable.
5. Time measured from rising edge of disable signal until optical output (laser diode) has turned off.
6. Time measured from falling edge of enable signal until optical output has stabilized at nominal output power level.
7. The laser bias current is obtained by dividing the bias voltage by the 10
current-sensing resistors. (See Figure 1.) When measuring these
voltages or using them in conjunction with alarm circuits, use a high-input impedance device.
8. The laser back-facet monitor voltage is a scaled output that tracks the transmitter optical output power.
Parameter
Symbol
Min
Max
Unit
Supply Voltage
*
--
--
5.5
V
Operating Case Temperature Range
T
C
40
85
°C
Storage Case Temperature Range
T
stg
40
85
°C
Lead Soldering Temperature/Time
--
--
250/10
°C/s
Relative Humidity (noncondensing)
RH
--
85
%
Minimum Fiber Bend Radius
--
1.00 (25.4)
--
in. (mm)
Parameter
Symbol
Min
Typ
Max
Unit
Power Supply Voltage
1
V
4.75
5.0
5.50
V
Power Supply Current Drain
I
TOTAL
--
30
130
mA
Input Data Voltage:
2
Low
High
V
IL
V
IH
1.81
1.16
--
--
1.47
0.88
V
V
Input Transition Time
3
t
I
--
t/4
--
ns
Transmitter Disable Voltage
4
V
D
V
CC
2.0
--
V
CC
V
Transmitter Enable Voltage
V
EN
V
EE
--
V
EE
+ 0.8
V
Output Disable Time
5
t
D
--
--
0.20
µs
Output Enable Time
6
t
EN
--
--
2.00
µs
Laser Bias Voltage
7
V
B
0.01
0.06
0.70
V
Laser Monitor Voltage (50% duty cycle)
8
V
BF
0.01
0.05
0.20
V
6
For additional information and latest specifications, see our website: www.triquint.com
Data Sheet
February 2003
1241/1243/1245-Type Uncooled Laser Transmitters
Characteristics
(continued)
Table 3. Optical Characteristics
1. Output power definitions and measurement per ITU-T Recommendation G.957 and G.958.
2. Ratio of logic 1 to logic 0 power levels.
3. Between 10% and 90% (50% duty cycle).
4. Root-mean-square spectral width accounts for modes up to and including those 20 dB down from the central mode.
(Applies to 1241-Type only.)
5. Applies to 1243/1245-Type only.
Recommended User Interfaces
1-496(C).c
* Locate these components as close to DATA/DATA inputs as possible.
Note: The 1241 gigabit version does not require the external 50
terminations since this termination is included inside the module.
Figure 2. dc-Coupled, Differential Input
Parameter
Symbol
Min
Typ
Max
Unit
Average Power Output Options
1
P
O
See Ordering Information.
dBm
Extinction Ratio
2
r
E
10
--
--
dB
Optical Rise and Fall Times
3
:
OC-3/STM-1
OC-12/STM4
1062.5 Mb/s
t
R
, t
F
t
R
, t
F
t
R
, t
F
--
--
--
--
--
--
1.0
0.5
0.37
ns
ns
ns
Center Wavelength
See Ordering Information.
nm
RMS Spectral Width
4
--
--
4
nm
Side-mode Suppression Ratio
5
SMSR
30
--
--
dB
For additional information and latest specifications, see our website: www.triquint.com
7
Data Sheet
1241/1243/1245-Type Uncooled Laser Transmitters
February 2003
Recommended User Interfaces
(continued)
1-497(C)
Note: Input can also be connected to DATA; unused input pin remains unconnected.
(622 Mb/s and below only.)
Figure 3. dc-coupled, Single-Ended Input
1-498(C)
* This network introduces a slight offset between DATA and DATA, which turns the laser
transmitter off when there is no data present at the inputs. (622 Mb/s and below only.)
Figure 4. ac-Coupled, Single-Ended Input
Qualification and Reliability
To help ensure high product reliability and customer satisfaction, TriQuint is committed to an intensive quality pro-
gram that starts in the design phase and proceeds through the manufacturing process. Optoelectronics modules
are qualified to TriQuint internal standards using MIL-STD-883 test methods and procedures and using sampling
techniques consistent with Telcordia requirements. The 1241/1243/1245 series of transmitters have undergone an
extensive and rigorous set of qualification tests. This qualification program fully meets the intent of Telcordia reli-
ability practices TR-NWT-000468 and TA-NWT-000983. In addition, the design, development, and manufacturing
facility of the Optoelectronics unit at TriQuint Semiconductor has been certified to be in full compliance with the lat-
est ISO
®
-9001 Quality System Standards.
8
For additional information and latest specifications, see our website: www.triquint.com
Data Sheet
February 2003
1241/1243/1245-Type Uncooled Laser Transmitters
Outline Diagram
Dimensions are in inches and (millimeters). Unless otherwise noted, tolerances are ±0.005 in (±0.127 mm).
1-987C).a
For additional information and latest specifications, see our website: www.triquint.com
9
Data Sheet
1241/1243/1245-Type Uncooled Laser Transmitters
February 2003
Laser Safety Information
Class I Laser Product
All versions of the 1241/1243/1245-Type transmitters are Class I laser products per CDRH, 21 CFR 1040 Laser
Safety requirements. The 1241/1243/1245-Type transmitters have been classified with the FDA under accession
number 8720009. All versions are Class I laser products per IEC
®
60825-1:1993.
CAUTION: Use of controls, adjustments, and procedures other than those specified herein may result in
hazardous laser radiation exposure.
This product complies with 21 CFR 1040.10 and 1040.11.
8.8 µm single-mode pigtail with connector
Wavelength = 1.3 µm
Maximum power = 1.6 mW
Notice
Unterminated optical connectors may emit laser radiation.
Do not view with optical instruments.
Table 4. TriQuint Transmitters for SONET/SDH Applications
* Full SONET/SDH compliance, 40 °C to +85 °C.
Full SONET/SDH compliance, 20 °C to +70 °C.
Connector
Type
1.3 µm Transmitter Type
*
1.55 µm Transmitter Type
Short and Intermediate Reach
(<2 km and ~15 km)
Long Reach
~40 km
Long Reach
~80 km
OC-3/
STM-1
OC-12/
STM-4
OC-3/
STM-1
OC-12/
STM-4
OC-3/
STM-1
OC-12/
STM-4
FC-PC
1241FAUC
1241FBUC
1243FAFD
1243FBDC
1245FAFC
1245FBDC
SC
1241CAUC
1241CBUC
1243CAFD
1243CBDC
1245CAFC
1245CBDC
Data Sheet
February 2003
1241/1243/1245-Type Uncooled Laser Transmitters
10
10
For additional information and latest specifications, see our website: www.triquint.com
Ordering Information
Table 5. 1241/1243/1245-Type Transmitter Ordering Information
*
for these codes is 2.5 nm maximum. All other 1241-type codes are 4 nm maximum.
OC-3/STM-1 Transmitter Codes
Operating
Case Temp.
Range (°C)
Average Output
Power
(dBM)
Center
Wavelength
(nm)
Connector
122x
Equivalent
Product
Order
Code
Comcode
Min
Max
Min
Typ
Max
Min
Max
0
65
3
0
2
1290
1330
FC-PC
1227AE
1241FADC
108123449
0
65
3
0
2
1290
1330
SC
1227AF
1241CADC
108123480
0
65
5
2
0
1280
1335
FC-PC
1227YA
1241FAFC
108123357
0
65
5
2
0
1280
1335
SC
1227YB
1241CAFC
108123373
0
65
8
5
2
1260
1360
SC
1227CA
1241CALC
108123324
0
65
8
5
2
1260
1360
FC-PC
1227C
1241FALC
108123563
20
70
5
2
0
1480
1580
SC
1229CB5
1245CAFC
108400409
20
70
5
2
0
1480
1580
FC-PC
1229FB5
1245FAFC
108400417
40
85
5
2
0
1280
1335
SC
1227YD
1243CAFD
108123423
40
85
5
2
0
1280
1335
FC-PC
1227YE
1243FAFD
108123415
40
85
12
8
5
1260
1360
SC
1227FB
1241CAPC
108123282
40
85
12
8
5
1260
1360
FC-PC
1227F
1241FAPC
108123266
40
85
15
11
8
1260
1360
SC
1227HA
1241CAUC
*
108123209
40
85
15
11
8
1260
1360
FC-PC
1227H
1241FAUC
*
108123159
OC-12/STM-4 Transmitter Codes
0
65
3
0
2
1290
1330
FC-PC
1227AK
1241FBDC
108123456
0
65
3
0
2
1290
1330
SC
1227AN
1241CBDC
108123498
0
65
8
5
2
1260
1360
FC-PC
1227D
1241FBLC
108123316
20
70
3
0
2
1480
1580
SC
1229CA5
1245CBDC
108400391
20
70
3
0
2
1480
1580
FC-PC
1229FA5
1245FBDC
108400425
40
85
3
0
2
1280
1335
FC-PC
1229FA
1243FBDC
108123506
40
85
3
0
2
1280
1335
SC
1229CA
1243CBDC
108123522
40
85
12
8
5
1260
1360
FC-PC
1227G
1241FBPC
108123274
40
85
15
11
8
1260
1360
FC-PC
1227AC
1241FBUC
*
108123167
40
85
15
11
8
1274
1356
SC
1227PG
1241CBU
*
108123217
Fibre Channel--1062.5 Mb/s
10
65
11
8
5
1260
1360
FC-PC
1238A
1241FCPC
108309287
10
65
11
8
5
1260
1360
FC-PC
1238B
1241FCPD
108309295
10
65
3
0
2
1290
1330
FC-PC
1238C
1241FCDC
108309279
Additional Information
For the latest specifications, additional product information, worldwide sales and distribution locations, and information about TriQuint:
Web: www.triquint.com
Tel: (503) 615-9000
E-mail: info_opto@tqs.com
Fax: (503) 615-8902
For technical questions and additional information on specific applications:
E-mail: info_opto@tqs.com
The information provided herein is believed to be reliable; TriQuint assumes no liability for inaccuracies or omissions. TriQuint assumes no responsibility for the use of this information, and all
such information shall be entirely at the user's own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are
implied or granted to any third party.
TriQuint does not authorize or warranty any TriQuint product for use in life-support devices and/or systems.
Copyright © 2003 TriQuint Semiconductor Inc. All rights reserved.
DS99-228 Revision 1.1, February, 2003
Data Sheet
February 2003
1241/1243/1245-Type Uncooled Laser Transmitters
Part Numbering for the 1241/1243/1245-Type Transmitter
1 2 4 X X X X X
Field Description
Laser Type:
1 = 1.3 µm Fabry-Perot laser, 3 = 1.3 µm DFB laser, 5 = 1.55 µm DFB laser
Optical Connector:
C = SC, F = FC/PC
Data Rate:
A = 155 Mb/s, B = 622 Mb/s, C = 1062.5 Mb/s
Typical Power:
D = 0 dBm, F = 2 dBm, L = 5 dBm, P = 8 dBm, U = 11 dBm
Customer Options:
A--F
Table 6. Related Products
Description
Device Number
Document Number
155 Mb/s and 622 Mb/s for SONET/
SDH Applications
1340-Type Pin Receiver
DS00-098
155 Mb/s and 622 Mb/s Receivers with
Clock and Data Recovery for SONET/
SDH Applications
1345-Type Pin Receiver with Clock and
Data Recovery
DS00-099
Telcordia Technologies is a trademark of Telcordia Technologies, Inc.
ISO is a registered trademark of The International Organization for Standardization.
IEC is a registered trademark of The International Electrotechnical Commission.
PDF 
ZIP